To avoid any equipment damage or bodily injury caused by improper use, read the following safety recommendations before installation. Note that the recommendations do not cover every possible hazardous condition. When performing operations, you should also comply with the safety regulations of the location.

Do not attempt to carry out maintenance or debugging inside the equipment on your own, in order to avoid injuries caused by unforeseen or other abnormal factors.

General safety recommendations

· Only qualified professionals or trained personnel can install, operate, or maintain the device.

· Do not place the device on an unstable case or desk. The device might be severely damaged in case of a fall.

· During the operation of electrical equipment, the surface of the device might become hot. Install the equipment in a restricted access area. Only maintenance personnel or trained individuals should access equipment in restricted areas, to prevent others from touching it and to avoid burns.

· Keep the chassis clean and dust-free.

· Do not place the device near water or in a damp environment. Prevent water or moisture from entering the device chassis.

· It is strictly forbidden to store flammable and explosive items in and around the area where the equipment is located.

· Handle the devices according to the sizes of and packaging symbols on the packages.

Electricity safety

· Carefully examine your work area for possible hazards, such as ungrounded power extension cables, missing safety grounds, or moist floors.

· Locate the emergency power-off switch in the room before installation, operation, and maintenance so you can shut off the power immediately if an accident occurs. Remove the power cord if necessary.

· Make sure the operating voltage is in the required range.

· Make sure the device is correctly grounded before powering on the device if grounding is required.

Laser safety

WARNING!

· The device is a Class 1 laser device.

· Disconnected optical fibers or transceiver modules might emit invisible laser light. Do not stare into beams or view directly with optical instruments when the switch is operating.

CAUTION:

· Install dust caps for open optical fiber connectors to protect them from contamination and ESD damage.

· Insert dust plugs into open fiber ports and transceiver module ports to protect them from contamination and ESD damage.

Moving safety

· Lift and put down the chassis slowly and never move it suddenly.

· After you move the device from a location below 0°C (32°F) to the equipment room, follow these guidelines to prevent condensation:

¡ Wait a minimum of 30 minutes before unpacking the device.

¡ Wait a minimum of 2 hours before powering on the device.

· Remove all external cables before moving the device.

· If the device is to be transported over a long distance, perform the following tasks before the transport:

¡ Remove all removable components (such as power modules, NR main control and baseband modules, transceiver modules, and antenna) and place them separately in antistatic bags.

¡ Replace the filler panels provided with the device to prevent obstacle intrusions and damages to the device.

· To transport the device over a short distance, make sure the removable components are securely installed on the device.

· When you move or lift the device, support the bottom of the device, rather than hold any removable component.

ESD prevention

To prevent electrostatic discharge (ESD) damage, you can wear antistatic gloves or an ESD wrist strap with an alligator clip.

Antistatic gloves are suitable for the installation, operation, and maintenance of equipment.

ESD wrist straps, depending on the type of connector, can be categorized into alligator clip ESD wrist straps and plug-type ESD wrist straps:

· Alligator clip ESD wrist straps are suitable for the following scenarios:

¡ Installing equipment into a 19-inch rack, assuming the cabinet is well grounded.

¡ Operating and maintaining equipment already installed in the cabinet.

· Plug-type ESD wrist straps are suitable for operating and maintaining devices with an ESD socket that have been properly grounded.

NOTE:

· As a best practice, use a unified ESD wrist strap, meaning the ESD wrist strap's connector is a two-in-one combination of alligator clip and plug-type, allowing users to choose one of the connector styles based on the actual situation.

· When you use a plug-type ESD wrist strap, make sure that the device is properly grounded; otherwise, it will not achieve the antistatic effect.

To attach the ESD wrist strap:

1. Wear the wrist strap on your wrist.

2. Lock the wrist strap tight around your wrist to keep good contact with the skin.

3. Secure the wrist strap lock and the alligator clip lock together.

4. Connect the antistatic connector.

¡ As shown in Figure1-1, for the alligator clip ESD wrist strap, attach the alligator clip to the rack.

¡ As shown in Figure1-2, for the plug-type ESD wrist strap, insert the plug into the ESD socket of the device.

Figure1-1 Wearing an alligator clip ESD wrist strap

(1) ESD wrist strap	(2) Lock	(3) Alligator clip

Figure1-2 Wearing a plug-type ESD wrist strap

1: ESD wrist strap	2: Release latch
3: ESD connector	4: ESD jack

Working at heights

· Work at height must comply with the national working standards for high-altitude operations.

· Workers must undergo a physical examination and safety technical training, and only after passing an examination can they carry out work at height.

· Before starting high-altitude work, check that all the equipment is in good condition, including the necessary machinery and tools.

· Workers at height should take safety precautions, wearing helmets and safety belts.

· When working at height, be vigilant to prevent objects from falling.

· In cold regions, workers should wear warm clothing in advance.

· External high-altitude work should be carried out under good weather conditions, with wind forces less than 4; work should cease if it exceeds this. Moreover, it is not suitable to work at height outdoors in rain, snow, fog, poor visibility, and extreme temperatures (above 38°C or below -10°C).

· If a worker feels unwell while working at height, they must stop the work.

· When using a ladder during the work process, the following should be noted:

¡ Before using a ladder, ensure it is stable and undamaged, and do not exceed its weight limit when using.

¡ If the ladder is inclined over 5m, an upright double-legged ladder over 3m, or work is conducted in a hazardous environment, someone must hold the ladder or other safety measures must be taken. An A-frame ladder should be fully extended when in use.

¡ The inclination of the ladder should have an angle with the ground that is less than or equal to 75°; this can be measured with a protractor or by using your arm. When using a ladder, place the wider rungs at the bottom or use protective measures to prevent slipping.

¡ Place the ladder on a firm surface and never on unstable objects like cardboard boxes or stones that can tip over or slide.

¡ When leaning on an inclined ladder, do not shift your center of gravity beyond the edges of the ladder frame. When climbing a ladder, do not exceed the last four rungs, and if climbing onto a roof, the ladder should extend at least 1m beyond the eaves.

Examining the installation site

To ensure correct operation and long service life of the device, install it in an environment that meets the requirements described in the following subsections.

Temperature and humidity

Maintain appropriate temperature and humidity in the installation site.

· Lasting high relative humidity can cause poor insulation, electricity leakage, mechanical property change of materials, and metal corrosion.

· Lasting low relative humidity can cause washer contraction and ESD and cause problems including loose mounting screws and circuit failure.

· High temperature can accelerate the aging of insulation materials and significantly lower the reliability and lifespan of the device.

For the temperature and humidity requirements for the device, see the hardware information and specifications.

Cleanliness

Dust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of metal components and contact points, especially when indoor relative humidity is low. In the worst case, electrostatic adsorption can cause communication failure.

Table1-1 Dust concentration limit in the equipment room

Substance	Concentration limit (particles/m³)
Dust	≤ 17600000
NOTE: Dust diameter ≥ 0.5 μm

Substance

Concentration limit (particles/m³)

Dust

≤ 17600000

NOTE:

Dust diameter ≥ 0.5 μm

The equipment room must also meet limits on salts, acids, and sulfides to eliminate corrosion and premature aging of components, as shown in Table1-2.

Table1-2 Harmful gas limits in the equipment room

Gas	Average concentration (mg/m³)	Maximum concentration (mg/m3)
SO2	0.3	1.0
H2S	0.1	0.5
Cl2	0.1	0.3
HCI	0.1	0.5
HF	0.01	0.03
NH₃	1.0	3.0
O₃	0.05	0.1
NO_X	0.5	1.0

NOTE:

The average value is the typical control limit for corrosive gases in a data center environment, and it is generally not recommended to exceed this requirement. The maximum value is the limit or peak value, and the time reaching the limit or peak value should not exceed 30 minutes per day.

Cooling

To provide adequate cooling for the device, follow these guidelines:

· Reserve a minimum clearance of 60 mm (2.36 in) for both the air inlet vent and air outlet vent.

· Make sure the installation site has a good cooling system.

· Identify the cold and hot aisle arrangement at the installation site, and make sure the device draws in air from the cold aisle and exhausts air to the hot aisle.

· Identify the airflow directions of the upper and lower devices and make sure hot air exhausted from the lower devices does not circulate into the upper devices.

For information about the cooling system, see the hardware information and specifications.

Rack and wall

To rack or wall-mount the device, make sure the rack or wall meets the following requirements:

· The rack or wall is sturdy enough to support four times the weights of the device and its accessories.

· The wall can accommodate the device.

· When installing more than two pieces of equipment, all devices should be aligned on the same horizontal (or vertical) line, with spacing between them to facilitate daily operation and maintenance, and sufficient space must be reserved for future system expansion.

· The rack can accommodate the device. See Table1-3 for the requirements for rack dimensions.

Table1-3 Requirements for rack dimensions

Installation method	Device dimensions	Rack requirements
Using mounting brackets	· Height—88 mm (3.46 in) · Width—440 mm (17.32 in) · Total depth—333 mm (13.11 in)	· Depth (recommended)—A minimum of 600 mm (23.62 in). · Distance between the front rack posts and front door—A minimum of 100 mm (3.94 in). · Distance between the front rack posts and rear door—A minimum of 338 mm (13.31 in). When there is a situation with rear cabling, a larger space for cable routing should be reserved from the front perforated strip to the rear door.

Installation method

Device dimensions

Rack requirements

Using mounting brackets

· Height—88 mm (3.46 in)

· Width—440 mm (17.32 in)

· Total depth—333 mm (13.11 in)

· Depth (recommended)—A minimum of 600 mm (23.62 in).

· Distance between the front rack posts and front door—A minimum of 100 mm (3.94 in).

· Distance between the front rack posts and rear door—A minimum of 338 mm (13.31 in). When there is a situation with rear cabling, a larger space for cable routing should be reserved from the front perforated strip to the rear door.

IMPORTANT:

For the rack door to close easily, make sure the rack meets the depth requirements described in Table1-3.

· When installing equipment on the wall, for ease of maintenance, there must be no obstructions within 800mm in front of the front panel, within 20mm behind the rear panel, and within 60mm on both sides of the equipment.

· The rack is grounded reliably.

EMI

All electromagnetic interference (EMI) sources, from outside or inside of the device and application system, adversely affect the switch in the following ways:

· A conduction pattern of capacitance coupling.

· Inductance coupling.

· Electromagnetic wave radiation.

· Common impedance (including the grounding system) coupling.

To prevent EMI, use the following guidelines:

· If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE) to filter interference from the power grid.

· Keep the device far away from radio transmitting stations, radar stations, and high-frequency devices.

· Use electromagnetic shielding, for example, shielded interface cables, when necessary.

Lightning protection

Lightning protection for the device

To enhance lightning protection for the device, follow these guidelines:

· Make sure the installation site, power source, and the device are reliably grounded.

· Install a surge protected power strip at the power input end.

· To prevent signal ports from getting damaged by overvoltage or overcurrent caused by lightning strikes, install a surge protection device (SPD) for the interface cables if part of the cable is routed outdoors. Ground the SPD near the feeder window.

Lightning protection for the GNSS antenna

When a Global Navigation Satellite System (GNSS) antenna connects to the device through a feeder, do as follows to protect the GNSS antenna from lightning:

· Make sure the GNSS antenna is within a 45-degree angle from the top of the lightning rod and is lower than the lightning rod.

· Ground the feeder shielding layer at the antenna, away from the tower (pole), and outside the entrance of the equipment room nearby. If the distance between the equipment room entrance and the tower (pole) is shorter than 2 m (6.56 ft), do not ground the feeder away from the tower (pole).

· Ground the feeder as close as possible to the antenna and make sure the feeder is as short as possible.

· Install a coaxial SPD for the indoor GNSS feeder.

To connect the grounding cable of the SPD:

¡ Install the SPD separately—Connect the grounding cable to the grounding strip for the feeder window.

¡ Install the feeder outdoor with insulation—You can also connect the grounding cable to the indoor or general main earthing conductor.

· Waterproof the feeder grounding.

· As a best practice, do not install the GNSS antenna on a tower. If the antenna must be installed on a tower, follow these guidelines:

¡ Ground the feeder within 1 m (3.28 ft) below the antenna. Install an SPD under the antenna. The SPD connects to the grounding strip for the control tower through a grounding cable.

¡ Add another grounding point in the middle of the tower when the feeder or other coaxial cables on the tower are longer than 60 m (196.85 ft).

Cable layout requirements

General cable layout requirements

· Signal and control cables should avoid being routed together with high-voltage power conduits and fire protection piping to ensure there are no strong electrical or magnetic interferences. When coaxial cables, network cables, and other cables are laid parallel to power lines, they should meet the requirements shown in Table1-4.

Table1-4 Requirements for Isolation when Cables are Laid Parallel

Condition	Minimum Clearance
Power line parallel with coaxial cable	· 130mm · When coaxial cable uses shielded cable, the minimum clearance can be appropriately reduced and should comply with design requirements
One side in grounded metal trough or steel pipe	· 70mm · When coaxial cable uses shielded cable, the minimum clearance can be appropriately reduced and should comply with design requirements
Both sides in grounded metal trough or steel pipe	· If both are in grounded metal troughs or steel pipes and the parallel length is less than 10m, the minimum distance can be 10mm · When coaxial cable uses shielded cable, the minimum clearance can be appropriately reduced and should comply with design requirements

· Cables should be laid along cable trays or ducts, with clear and straight routing, without crossing or dangling in the air. When passing a white wall, cables must go through conduits.

· Cables need to be tied or fixed with specialized cable clips, maintaining consistent intervals for ties or fixings, and complying with requirements. Excess tie ends should be cut off, and all tie ends should be trimmed flush without any sharp points. Reserved cables should be neatly coiled and secured without affecting the normal operation of other equipment and devices. The spacing for tying cables and conduits should meet the requirements shown in Table1-5.

Table1-5 Cable tie spacing requirements

Condition	≤1/2″ wire diameter	>1/2″ wire diameter
When laid out horizontally	≤ 1.0 m	≤ 1.5 m
When laid out vertically	≤ 0.8 m	≤ 1.0 m

· Cables should be laid straight and neatly, avoiding any uneven or sharp bends. When bending is required, the bend should be smooth and uniform, and the bending radius must comply with the specific requirements for that type of cable.

¡ The bend radius of the coaxial cable must meet the requirements shown in Table1-6.

Table1-6 Requirements for the Minimum Bending Radius of Coaxial Cables

Cable	7/8" (general)	7/8" (ultra-flexible)	1/2" (general)	1/2" (ultra-flexible)
Feeder cable model	22 mm	21 mm	12 mm	9 mm
Primary minimum curvature radius	240 mm	170 mm	140 mm	60 mm
Secondary minimum curvature radius	500 mm	260 mm	250 mm	110 mm

¡ Ensure that the bending radius of the optical cable meets the requirements: the static bending radius should be at least 10 times the cable's outer diameter, the dynamic bending radius should be at least 20 times the cable's outer diameter, and the tail fiber reel-off bending radius should be at least 80 mm.

¡ The bending radius of the power-feeding optical cable should be at least 15 times the diameter of the cable.

¡ The bending radius for Category 5e cables should be more than 30 mm, and for CAT6A cables, it should be more than 50 mm.

¡ The bending radius of the optical-electrical composite cable should be at least 10 times the outer diameter of the cable, and for 1.5 square optical-electrical composite cables, the bending radius should be at least 90 mm.

¡ The bending radius of the optical fiber should be at least 100 mm.

¡ The bending radius of the power cable should be greater than 50 mm (or not less than 20 times the outer diameter of the cable).

¡ The bending radius of the grounding wire should be more than 0.13 m.

· Cables should be made of flame-retardant or fire-resistant materials; their outer surface should be clean, clear of construction marks, without apparent folding or twisting, and should avoid being forcibly stretched. The cable's sheath insulation layer should be free of damage and scratches, and the feeder should have no exposed copper.

· For equipment working outdoors or in humid environments, all connection joints between the equipment and cables, antennas and cables, or between cables must have waterproof measures in place.

· When cables are connected to outdoor equipment, the outer diameter of the cable must match the inner diameter of the waterproof plug. Unused connectors should be tightened with plugs or sealed with waterproof tape at the ends to prevent water leakage.

· Before outdoor cables enter indoors, they must be bent for waterproofing. The bottom of the corrugated pipe's waterproof bend must have a drip hole cut to prevent rainwater from entering indoors along the feeder line. The entrance points and holes must be sealed with waterproof materials. When bending, the bending radius requirements must be met to avoid affecting indicators such as the standing wave ratio.

· All entry holes (including cable conduit holes) in the equipment room should be sealed with fireproof materials after installation. When indoor cable trays pass through wall holes or floor slabs, protective frames should be installed around the holes. Waterproof sealing of feeder windows should meet the sealing requirements of engineering design and relevant standards.

· For cables containing metallic materials, proper shielding and grounding measures should be in place before entering the equipment room, such as using shielded cables or laying through steel pipes, with metal shielding layers at both ends reliably grounded.

· All cables should be correctly connected; both ends of the cables should have clear and distinct labels, and the connectors should be made to standard, without any looseness.

Cable trays

· You should assemble the cable tray (or channel) so that it is straight, without any noticeable twists or tilts. Cable trays running horizontally along the wall must be parallel to the ground, while those running vertically must be perpendicular to the ground.

· When installing the side supports, terminal reinforcing angle irons, hangers, and columns for the cable tray (or channel), you must follow engineering design requirements, ensuring that these components are secure, upright, and straight.

· You must maintain a consistent length of excess material for all the expansion bolts you use for support and reinforcement.

· You should apply paint to all iron parts uniformly, ensuring the color is consistent and the finish is free from marks and does not bubble.

· If you use metal steel pipes or trunking for the cable tray (or channel), you must ground the system according to design requirements. You should choose the nearest point for grounding and ensure that the electrical connection remains in good condition.

Hybrid copper-fiber cables

· After you lay the hybrid fiber-optic and power cables, you should ensure there is a surplus. You should reserve lengths of 0.5m to 1.0m in handover rooms and equipment rooms, and 10mm to 30mm in work areas, following the design requirements for any special needs.

· You should make sure that the distance between ties for hybrid fiber-optic and power cables does not exceed 40cm when they are concealed within conduits or above suspended ceilings; and when the cables are placed on surfaces or in open conduit areas, this distance should not exceed 30cm.

· If you cannot install hybrid fiber-optic and power cables within conduits, cable shafts, suspended ceilings, or ceilings, consider mounting them on cable racks or encasing them in PVC pipes.

· You must ensure that no heavy objects or other heavy cables are placed on top of the laid hybrid fiber-optic and power cables to prevent any pressure damage.

· When you fabricate fiber optic cold splices or fusion splices, you should meet design and construction requirements, ensuring that the link loss of the fiber optic connectors does not exceed 1.2dB, in accordance with industry standards.

Fibers and pigtails

· Fiber optic cables within channels should be protected with conduit or trunking, and the unprotected parts should be neatly tied with releasable cable ties.

· The craftsmanship of fiber optic cold splices or fusion splices should meet design and construction requirements, with the link loss of the fiber optic connectors not exceeding 1.2dB. After fusion splicing, protective measures such as splice protectors should be applied.

· When securing pigtail fibers inside a rack with cable ties, do not tie them too tightly; the pigtail should be able to move freely within the loop of the tie. It is recommended to wrap a nylon Velcro strap around the pigtail before securing it with a cable tie.

· Pigtail fibers laid outside the rack should be protected with conduit, with the end of the conduit fixed or extending into the cabinet. Both ends of the pigtail protective conduit should be sealed with insulating tape to prevent the fiber from sliding and being cut by the conduit edge. The tape color should match the conduit color.

· Optical splice boxes should be installed firmly and reliably, well-sealed, and easy to maintain. When the optical cable has a metal armor layer or metal reinforcement, it should be reliably grounded at the splice box.

· Installed fiber optic cables or pigtails should not be pressed by heavy objects or other cables with significant weight.

· Excessively long pigtails should be neatly wound inside a pigtail box or coiled and secured.

· Unused pigtail connectors should be protected with protective caps.

· The reinforcing core of the optical cable should be grounded for lightning protection. The grounding wire specification should be no less than 16 square millimeters.

Network cables

· After laying Category 5e and Category 6 cables, there should be a surplus. A reserved length of 0.5 m to 1.0 m should be planned for handover rooms and equipment rooms, and 10mm to 30 mm for work areas. If there are special requirements, reserve lengths according to design needs.

· Category 5e and Category 6 cables should avoid being laid alongside strong electric lines, high-voltage pipelines, fire protection pipelines, etc., to ensure there is no interference from strong electric or magnetic fields.

· For the bundling of Category 5e and Category 6 cables, the distance between ties should not exceed 40 cm where the cables are concealed within conduits or above suspended ceilings; at open conduit areas and when cables are visibly laid, the distance between ties should not exceed 30 cm. Category 5e and Category 6 cables must be securely tied with nylon cable ties.

· For Category 5e and Category 6 cables that cannot be laid in conduits, cable shafts, suspended ceilings, or ceilings, consider installing them on cable racks or using PVC pipes.

· At the equipment end of Category 5e and Category 6 cables, a certain amount of slack should be left and neatly tied for easy maintenance and cable termination in the future.

· The laying length of Category 5e and Category 6 cables generally should not exceed 100 meters. If the actual length is more than 100 meters, the design should be revised, or certain measures should be taken to address the issue.

· The craftsmanship of RJ45 connectors should meet the design and construction requirements.

Power cords

· You must route the power cables through iron or PVC pipes according to design requirements. The quality and specifications of the iron and PVC pipes should meet design standards. The ends of the pipes should be smooth, with the interiors clean, dry, and the joints tightly sealed. Screw connections are not permitted, and power cables running through the pipes must not have any splices.

· You should lay direct current (DC) power cables and alternating current (AC) power cables separately to avoid bundling them together in the same cable bundle.

· The insulation resistance between cores and between the core and ground should be no less than 1MΩ.

· You must securely fix the power outlets in place. If you need to use a power strip, you should place it in a location that is not easily accessible for safety. Power outlets and strips must have 3C certification.

· When connecting power cables to the terminals of the power distribution cabinet, you should use copper lugs for power cables above 6 square millimeters and secure them with screws for a good contact.

· The soldering (or crimping) of the lug on both ends of the power cables should be firm, correct, and reliable. The core wires should not move within the terminals, ensuring good electrical contact.

· You should cover the terminal connections of the power cables with heat-shrink tubing or wrap them with at least two layers of insulating tape to prevent exposure of bare wires and the body of the lugs.

· The connection between the power cables and the equipment, as well as the battery group, should be reliable and secure. You should provide insulation protection at the terminal connections.

Coaxial cables

· The cable shafts through which coaxial cables are routed must be electrical shafts. You must not use air ducts or water pipe shafts for this purpose.

· You should lay coaxial cables within cable shafts and suspended ceiling trunking as much as possible, ensuring neat routing. Secure them with cable ties as specified. Coaxial cables must not be bundled with feed lines or wires from other manufacturers.

· The connectors of the coaxial cables must be firmly installed with good contact and should be waterproofed and sealed.

· The specifications and models of the cable connectors must match the RF coaxial cable.

· You should maintain moderate redundancy in cable length. The stripping dimensions for each layer should be suitable for the cable connector.

· The assembly of the cable connectors must ensure that the face of the connector is flat and free from damage or deformation, and that all components are complete and undamaged. The combination of the cable connector and the cable should be good, with the inner conductor's soldering or plug connection being firm and reliable, ensuring good electrical performance.

· For cable connectors with soldered core wires, the soldering quality must be solid and correct, with smooth solder joints, no cold solder, no bubbles, and no damage to the cable's insulation layer. You should use a solution of rosin and alcohol as a flux, strictly avoiding the use of solder oil.

· For cable connectors with plug-in core wires, you should clean the contact surfaces of the cable core wire (or copper tube) and the connector core before assembly. Apply an antioxidant, and then assemble.

· During cable construction, you must protect the ends of the cables from water and moisture. Exposed outdoor terminations must be waterproofed with waterproof tape. Terminations that have been exposed to moisture or water should be cut off.

Cable pipes

· For RF coaxial cables that are not laid in machine rooms, cable shafts, or suspended ceilings, you should use PVC conduits. All conduits should be laid out neatly and attractively, and you must use elbow connectors for the bends.

· Conduits should be laid as close to the walls as possible and secured with cable clips or feeder clamps to ensure that the cables do not cross or hang in the air. The fixing distance should be consistent with the uniform requirements mentioned earlier.

· If it is not feasible to lay the conduits along the wall, such as in an underground parking garage, the feeder conduits can be routed together with other conduits and secured with cable ties.

Grounding cables

· You should lay power ground wires and protective ground wires separately from the AC neutral lines, ensuring they do not touch each other or share the same path. You must ground the AC neutral line separately in the power room.

· If a grounding wire passes through a wall, you must protect the section that passes through with PVC or corrugated pipes, and you need to seal the wall penetration with fireproof putty.

· You should use copper strips or braided copper for the grounding busbar in the machine room and secure it to the cable tray approximately every meter.

· You must connect the grounding wire to the building's comprehensive grounding bar. If the cable tray is already connected to the comprehensive grounding bar, you may connect the grounding wire to the cable tray.

· When connecting ground wires to the ground grid, you must prevent the formation of an inverted funnel that could collect water. The direction of any funnel must face downward.

· You need to choose grounding points that are higher than the ground grid, and feeder grounding should be directed downwards along the feeder direction. Upward grounding is strictly prohibited.

· You are forbidden from connecting indoor equipment protective ground wires to outdoor lightning protection nets or rods on rooftops.

· You should seal grounding points on feeders directly with waterproof putty and then wrap them with electrical tape. For grounding points on grounding bars or grids, you should apply waterproofing and rust-proofing measures.

· When terminal connectors and wires are made of different materials, you should coat the contact surfaces with an antioxidant.

· You must use a grounding wire with a cross-sectional area of no less than 6 square millimeters for the protective grounding of equipment. The grounding location should comply with design requirements.

· You should keep AC ground, DC ground, protective ground, and lightning protection ground separate. Each grounding point must have good contact without any looseness, and you should treat it to prevent oxidation and rust.

· The grounding resistance should be less than 1 ohm.

· You must ensure that lightning rods have good electrical performance and grounding. All outdoor antennas should be within the 45° protection angle of the lightning rod.

· You must ground the feeder systems (including GNSS antenna feeders) that are brought indoors from the outdoors for lightning protection. The outdoor grounding points should be divided into A, B, and C points, where:

¡ Point A should be located 25 cm to 30 cm from the outdoor feeder head.

¡ Point B should be positioned 0.5 m to 1 m above the point before the feeder turns downward when descending the tower (if there is no tower above the machine room and the antenna is fixed on a support pole, you must implement B point grounding before the feeder turns down into the machine room from the building surface).

¡ Point C should be set before the feeder's waterproof bend. You must not ground at the bend radius of the feeder. If the feeder length exceeds 60 m, you should add an additional grounding point at the midpoint.

GNSS antennas

· When installing GNSS antennas and lightning arresters on the rooftop, due to the high risk of lightning crosstalk on parapet walls, it is not recommended to install them on parapet walls.

· You should avoid placing GNSS antennas in close proximity to the main lobe radiation area of base station RF antennas. You must not position them under microwave antennas, high-voltage cables, or in the strong radiation field of television transmission towers. The optimal installation location is one where there are no high-power transmission devices nearby, no co-channel interference, and no strong electromagnetic interference.

· There should be no obstructions around the GNSS antenna. If there are tall buildings or mountains nearby, you should ensure that any line drawn from the top of the antenna to the top of the obstruction forms an angle of at least 60 degrees with the vertical central axis of the antenna when looking in the southern direction. The antenna installation site should be higher than nearby metal objects, with a horizontal distance of at least 1.5 meters from any such objects. The antenna must be installed vertically, with a deviation in verticality of no more than 1 degree in all directions. The distance between the antenna and any WiFi antennas should be more than 3 meters.

Installation tools

No installation tools are provided with the device. Prepare the tools yourself as required.

2 Installation accessories

Table2-1 Installation accessories

Accessory	Diagram	Obtaining method	Remarks
Ear and M4 screws		Provided	· Used to secure the device to a cabinet or wall. · Used for grounding.
Equipment grounding wire		Provided	Used for grounding the device and surge protector, the provided grounding cable is 3 meters in length. NOTE: Prepare a sufficient number of surge protector grounding cables based on the actual situation.
Lightning arrester grounding wire		User supplied
AC power cord		Provided for AC power modules	3 meters in length.
DC power cord		Provided for DC power modules	3 meters in length.
RG8 cable		Optional	There are three models of RG8 cable available for selection: · CAB-RF-2.0m-SMAJ-SMAJ: This cable is suitable for scenarios where the BBU is connected to an SMA jack power divider through an RG8 cable, and both ends of the cable are equipped with SMA male connectors. · CAB-RF-3.0m-SMAJ-NK: This cable is suitable for scenarios where the BBU is connected to a surge protector or an N-type male power divider through an RG8 cable, with one end of the cable having an SMA male connector and the other end having an N-type female connector. · CAB-RF-3.0m-SMAJ-NJ: This cable is suitable for scenarios where the BBU is connected to an N-type female power divider through an RG8 cable, with one end of the cable having an SMA male connector and the other end having an N-type male connector.
Antenna feeder surge protector		Optional Product code: ALA-2600M-N	Used for lightning protection of the antenna feeder system. See Table2-2 for specific specifications. NOTE: Prepare a sufficient number of surge protectors for antennas based on actual conditions.
GNSS cable		Optional Product code: SL10879B	Supports both BeiDou and GPS clock signals, providing accurate timing for the device. See Table2-3 for specific specifications.
Expansion bolt		User supplied	Used for mounting device to wall NOTE: Prepare at least 4 pieces of M6*60 mm expansion bolts.
M6 screw and floating nut		User supplied	Used to attach the lugs to the square hole strips of the cabinet. NOTE: Prepare at least 4 sets of M6 screws and floating nuts.

Table2-2 Antenna feeder surge protector specifications

Item	Description
Rated Working Voltage	5 V DC
Maximum Continuous Operating Voltage	6 V DC
Rated Working Current	4 A DC
Series Resistance	0.5W±20%
Insulation Resistance	≥ 1 KW
Transmission Frequency	1.2 to 2.6 GHz
AC Withstand Capability	0.25 A (1s, 5 times)
Impact Withstand Capability	· 4 kV, 1.2/50 μs · 2 kA, 8/20 μs(10 times)
Nominal Discharge Current	20 kA (8/20μs)
Maximum Discharge Current	25 kA (8/20μs)
Voltage Protection Level	· ≤ 15 V (8/20μs, 20 kA) · ≤ 20 V (1.2/50μs, 4 kA)
SPD Type	Category 1
Continuous Power Input RF	≤ 100 W
Overload Failure Mode	Mode 3
Voltage Standing Wave Ratio	≤ 1.12
Insertion Loss	≤ 0.2 dB
Port Characteristic Impedance	50W
Port Type	N (F/M)
Waterproof Rating	IP67
Maximum Weight	300g
Operating Temperature	-40°C to +70°C
Storage Temperature	-40°C to +85°C
Relative Humidity	5% to 100%
Applicable Altitude	≤ 4000 m
CE Certified, the product meets the requirements of EN61643-21:2001 standard.

Table2-3 GNSS antenna specifications

Item	Description
Frequency Range (MHz)	· BeiDou: 1561.098±5 · GPS: 1575.42±5
Gain (dBi)	38±2
Voltage Standing Wave Ratio	≤ 2.0
Noise Figure	≤ 2.5 dB@ (-40 to +75)°C
Out-of-band Rejection	· 1575+30MHz&1561.098-30MHz > 15 · 1575+50MHz&1561.098-50MHz > 35 · 1575+100MHz&1561.098-100MHz > 70
Directional Pattern 3dB Beamwidth	(110±10)°
Output Impedance	50W

3 Installing the device

CAUTION:

Keep the tamper-proof seal on a mounting screw on the rear backplane intact, and if you want to open the chassis, contact H3C for permission. Otherwise, H3C shall not be liable for any consequence.

Installation methods

The equipment supports two installation methods:

· Mount the device to a 19-inch rack.

· Mount the device to a wall.

See the table below for the mounting accessories used for each installation method.

Table3-1 Accessories used in different installation methods

Installation method	Installation accessories	Diagram	Installation procedure
Mounting device in a 19-inch rack	M6 screws: 4 (User supplied) M6 floating nut: 4 (User supplied)		See Mounting the device in a 19-inch rack
Mounting device in a 19-inch rack	Mounting ears and M4 screws (Provided)	As shown in Figure3-1	See Mounting the device in a 19-inch rack
Mounting device to a wall	Mounting ears and M4 screws (Provided)	As shown in Figure3-1	See Mounting the device on a wall
Mounting device to a wall	M6*60 mm expansion screw: 4 (User supplied)	As shown in Figure3-2	See Mounting the device on a wall

Figure3-1 Mounting ear appearance

(1): Screw hole for installing the mounting ear to the device		(2): Grounding hole, used for grounding
(3): Grounding mark	(4): M4 screw
(5): Screw hole for installing the mounting ear to the rack or wall	(6): Mounting ear positioning pin

NOTE:

The left and right ears provided are not exactly the same. The right ear has a grounding hole and grounding mark.

Figure3-2 Expansion screw appearance

(1): Expansion bolt	(2): Hex nut
(3): Large washer	(4): Expansion tube
(5): Spring washer

Figure3-3 Installation flowchart

Mounting the device in a 19-inch rack

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Choose an appropriate installation location for the mounting ears. The device provides two mounting ear positions (front mounting ear position and wall mounting ear position). When installing the device into a 19-inch rack, select the front mounting ear position.

3. Use M4 screws to fix the mounting ears to the side panel of the device. The recommended tightening torque is 1.2 Nm. Figure3-4 illustrates the installation of a mounting ear on one side of the device. The installation method for the other side is similar and will not be repeated.

NOTE:

To avoid mounting the left and right ears incorrectly, each mounting ear comes with a positioning pin. When installed correctly, the positioning pin of the mounting ear will insert into the positioning holes on the left and right sides of the device.

Figure3-4 Installing ear

4. As shown in Figure3-5, install the cage nuts onto the square-hole strips of the cabinet:

a. Determine the installation position of the cage nuts on the cabinet's square-hole strips and mark it with a marker.

b. Install 4 cage nuts onto the square-hole strips of the cabinet, two on each side, ensuring that the corresponding cage nuts on the left and right are on the same horizontal plane.

Figure3-5 Installing the cage nuts onto the square-hole strips of the cabinet

5. As shown in Figure3-6, for installing equipment into a rack:

a. One installer should support the bottom of the equipment with their hands, move it along the rack to the appropriate position, so that the mounting holes on the equipment's ears align with the floating nuts on the rack's square hole strips.

b. Another installer should secure both ends of the ears onto the rack's square hole strips using M6 screws, with a recommended tightening torque of 3 Nm.

Figure3-6 Installing equipment to a rack

Mounting the device on a wall

IMPORTANT:

· Before drilling holes in a vertical wall, confirm that there are no strong electrical currents at the drilling location to avoid causing personal injury.

· When installing the device on a wall, ensure that the front panel of the device is not facing upwards to prevent dust or water droplets from entering the device through the interfaces on the front panel, which could affect the normal operation of the device.

1. Before operating the device, wear antistatic gloves.

2. Choose the appropriate mounting ear installation location. The device offers two mounting ear positions (front mounting ear position and wall mounting ear position). When mounting the device to a wall, select the wall mounting ear position.

3. To install the mounting ear on the device, first bring the mounting ear close to the device, aligning the mounting holes of the ear with the screw holes on the side of the device, as shown in Figure3-7.

NOTE:

To prevent the mounting ears from being installed backwards, each ear comes with a positioning pin. When installed correctly, the positioning pin of the mounting ear should fit into the corresponding locating holes on both the left and right sides of the device.

4. Tighten the M4 screws (provided) clockwise to secure the ear to the device, with a recommended tightening torque of 1.2 Nm.

Figure3-7 Mounting ear to device

5. As shown in Figure3-8, place the device against the wall at the desired installation location and use a marker to mark the positions of the ear screw holes on the wall.

Figure3-8 Marking the position of the screw holes

6. As shown in Figure3-9, drill four holes with a diameter of 8 mm and a depth of 60 mm at the marked locations using a hammer drill.

Figure3-9 Drilling holes at the marked locations

7. As shown in Figure3-10, secure the expansion bolts to the wall:

a. Insert the expansion bolt into the drilled hole and first tighten the hex nut clockwise as shown in ① of Figure3-10, to secure the expansion bolt to the wall.

b. As shown in ② of Figure3-10, unscrew the hex nut counterclockwise, and subsequently remove the spring washer and large washer; after completion, the expansion bolt should appear as shown in ③ of Figure3-10.

c. Repeat the above steps to fix the expansion bolts into the drilled holes on the wall.

Figure3-10 Securing the expansion bolt

8. As shown in Figure3-11, sequentially fit the device with ears, large washer, spring washer, and hex nut onto the expansion bolt, then tighten the hex nut clockwise to secure the device to the wall. The recommended tightening torque is 3 Nm.

Figure3-11 Mounting device to wall

Grounding the device

CAUTION:

Correctly connecting the grounding cable is crucial to lightning protection and EMI protection.

Connect the grounding cable to the earthing system in the equipment room, and make sure the engineering grounding device is operating safely. Do not connect it to a fire main or lightning rod.

Both the BBU body and the ears have grounding points; users can choose the grounding location based on the actual situation. When installing the BBU in a 19-inch rack, it is recommended to ground using the BBU body grounding point.

When installing the grounding wire, the flat surface of the grounding terminal should fit against the equipment's grounding contact point, with the curved surface facing outward.

1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.

2. Select a grounding hole for assembling the grounding wire.

The equipment body provides a primary grounding hole and a secondary grounding hole, as shown in Figure3-12. The manual takes the assembly of the grounding wire using the equipment body's primary grounding hole as an example to introduce the connection of the grounding wire to the equipment. You can choose the appropriate grounding hole for assembling the grounding wire according to the installation scenario. For information on the specific location of the grounding holes, see the hardware information and specifications.

3. Unpack the grounding cable.

4. Remove the grounding screws from the grounding holes.

5. As shown in Figure3-12, use grounding screws to attach the ring terminal of the grounding cable to the grounding hole on the device.

As a best practice, use a torque of 3 Nm to fasten the grounding screws.

6. As shown in Figure3-12, attach the ring terminal of the grounding cable to the grounding post on the grounding strip, and fasten the grounding cable to the grounding post with hex nuts.

Figure3-12 Attaching a grounding cable to the device and grounding strip

4 Installing removable components

CAUTION:

· Do not touch the components on the surface of pluggable modules with your hands to avoid electrostatic damage.

· To prevent damage to the modules and device connectors, insert the modules slowly. If you encounter significant resistance or the module becomes misaligned during insertion, you must first remove the module and then reinsert it.

· If there is a need to relocate the equipment in the future, it is recommended to properly store the blank panel and the packaging box and bags of the pluggable modules, so they can be used when needed later.

· To prevent dust from entering and to ensure proper ventilation and cooling during operation, make sure that all pluggable module slots are not left empty. Be sure to install the corresponding modules or blank panels.

Installing a fan tray

CAUTION:

· Make sure the fan tray airflow direction and the airflow direction of the installation environment are the same.

· During the operation of the device, if the fan module fails, it is recommended to replace the fan module within 30 seconds. Exceeding this time may cause the device to overheat and trigger a protective restart.

The device provides only one fan tray slot and comes with a fan tray installed. If the fan tray fails, you must use a new fan tray of the same model to replace it. For the available fan trays and their specifications, see the hardware information and specifications.

To install a fan tray:

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Unpack the fan tray and verify that the fan tray model is correct.

3. As shown in ① of Figure4-1, pinch the handle on the fan module with one hand and support the bottom of the fan module with the other hand. Slide the fan module horizontally along the slot guide rails until the fan module is fully inserted into the slot.

4. As shown in ② of Figure4-1, use a Phillips screwdriver to tighten the screws on the fan module in a clockwise direction until the fan module is secured to the device. The recommended tightening torque is 0.5 Nm. If you find that the screws cannot be tightened, it is likely due to incorrect installation of the fan module. Carefully check if the fan module is properly inserted into the slot.

Figure4-1 Installing a fan tray

Installing a power module

CAUTION:

· The equipment supports both DC and AC types of power modules, but mixed insertion is not allowed.

· Before connecting the power cable, ensure that the equipment is properly grounded.

The installation and power-up process of the power module should be strictly in accordance with the sequence shown in Figure4-2, otherwise, it may cause damage to the equipment or personal injury.

Figure4-2 Installing and turning on a power module

The device has two power module slots, PWR0 and PWR1. The PWR0 slot does not have a blank panel installed, while the PWR1 slot has a power supply module blank panel installed. Users can configure one or two power modules for the device as needed. When only one power module is installed, it is recommended to install it in the PWR0 slot. For information on the power modules supported by the device and their specifications, see the hardware information and specifications or the power module user manual.

Installing an AC power module

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Remove the power supply module from its packaging box and confirm that the model number matches the one required.

3. Ensure the correct orientation of the power supply module (when inserting the module, make sure the text on the power supply module is upright). As shown in ① of Figure4-3, grasp the handle on the power supply module with one hand and support the bottom of the module with the other hand. Slide the power supply module horizontally along the slot guide rails until it is fully inserted into the slot.

4. As shown in ② of Figure4-3, use a Phillips screwdriver to tighten the screws on the power supply module in a clockwise direction to secure it to the device. The recommended tightening torque is 0.5 Nm. If the screws cannot be tightened, it is likely due to incorrect installation of the power supply module, check carefully.

Figure4-3 Installing an AC power module

Installing a DC power module

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Remove the power supply module from its packaging and verify that the model matches your requirements.

3. Ensure the correct orientation of the power supply module, with the text facing up. As shown in ① of Figure4-4, grasp the handle on the module with one hand and support the bottom with the other hand. Slide the module horizontally along the power slot guide rails until it is fully inserted.

4. As indicated in ② of Figure4-4, use a Phillips screwdriver to tighten the screws on the power supply module clockwise. Secure the module to the device with a recommended torque of 0.5 N•m. If the screws cannot be tightened, it may be due to incorrect module installation. Inspect carefully.

Figure4-4 Installing a DC power module

(Optional.) Removing the power module slot blank panel

If you need to install a power supply module into the PWR1 slot, remove the blank panel first. Follow these steps to remove the blank panel from the power slot:

1. Wear an ESD wrist strap or antistatic gloves. If using an ESD wrist strap, ensure it is in good contact with your skin and properly grounded.

2. As shown in ① of Figure4-5, use a Phillips screwdriver to turn the screw on the blank panel counterclockwise at the power slot to loosen it.

3. As shown in ② of Figure4-5, insert a flathead screwdriver into the protruding handle on the blank panel. Gently pry the blank panel outward along the slot guide rails, and keep the removed blank panel in a safe place for future use.

Figure4-5 Removing the power module slot blank panel

Installing an NR main control and baseband module

The NR main control and baseband module provides functions such as device management, configuration management, performance monitoring, clock management, signaling processing, baseband resource management, and radio resource management. For information on the NR main control and baseband modules supported by the device and their specifications, see the hardware information and specifications or the user manual for the NR main control and baseband module.

NOTE:

· The NR main control and baseband module can be installed in either SLOT1 or SLOT0 of the device. When only one NR main control and baseband module is configured, insert the NR main control and baseband module into SLOT1 of the device.

· When the device is in operation and there is a need to install or remove the NR main control and baseband module, power down the entire device first. After the installation or removal of the NR main control and baseband module is complete, power up and start the device again.

The device comes with SLOT1 and SLOT0 empty.

To install an NR main control and baseband module:

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Install the NR main control and baseband module:

a. Remove the NR main control and baseband module from its packaging bag and verify that the model matches what is required.

b. As shown in ① and ② of Figure4-6, place the NR main control and baseband module horizontally with the component side facing up. Then, flip the lever outward and slide the NR main control and baseband module along the slot guide rails into the slot slowly and horizontally.

c. As shown in ③ and ④ of Figure4-6, snap the lever inward to ensure the NR main control and baseband module makes firm contact with the backplane. Then, use a Phillips screwdriver to align with the screws on the NR main control and baseband module and turn them clockwise until tightened. The recommended torque is 0.5 Nm.

Figure4-6 Installing an NR main control and baseband module

Installing a transceiver module

WARNING!

Disconnected optical fibers or transceiver modules might emit invisible laser light. Do not stare into beams or view directly with optical instruments when the switch is operating.

CAUTION:

· Be careful not to touch the golden plating on a transceiver module during the installation process.

· Make sure the transceiver module is aligned correctly with the target port before pushing it into the port.

· Do not remove the dust plug from the transceiver module if you are not to connect an optical fiber to the module.

For the available transceiver modules and their specifications, see the hardware information and specifications or the transceiver module manual.

To install a transceiver module:

1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.

2. As shown by callout 1 in Figure4-7, remove the dust plug from the target fiber port.

3. As shown by callout 2 in Figure4-7, close the bail latch upward to catch the knob on the top of the transceiver module. Then correctly orient the transceiver module and align it with the fiber port, and push it gently into the port until you feel it snap into place.

Transceiver modules and fiber ports have disorientation rejection designs. If you cannot insert a transceiver module easily into a port, the orientation might be wrong. Remove and reorient the transceiver module.

Figure4-7 Installing a transceiver module

NOTE:

· In case of limited space, you can gently push against the front face of the transceiver module instead of the two sides.

· The triangular pin on a transceiver module and the hole in a fiber port function together to prevent the module from disengaging from the port.

5 Connecting cables

Waterproofing the cables

Devices working outdoors or in humid environments must have all connections waterproofed, including between equipment and cables, antennas and cables, or cable to cable.

The manual introduces waterproofing with a 1+3+3 process: one layer of insulating tape, followed by three layers of waterproof tape, then another three layers of insulating tape.

As shown in Figure5-1, when wrapping tape:

· Start wrapping from the bottom up.

· Before wrapping waterproof tape, stretch the tape evenly to half its original width, ensuring each layer covers about half of the one below.

· Pull each layer tight and press firmly to avoid wrinkles and gaps.

· In cold regions, use superior PVC insulating tape, while ordinary PVC tape is suitable for other areas.

Figure5-1 1+3+3 waterproofing process

Connecting power cords

WARNING!

· Make sure the device is correctly grounded.

· Provide a circuit breaker for each power input. When you connect a power cord, make sure the circuit breaker is switched off.

Connecting an AC power cord

1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.

2. Release the jaw of the cable clamp and open the cable clamp, and then connect the female connector of the power cord to the power receptacle on the power module, as shown by callout 1 and callout 2 in Figure5-2.

3. As shown by callout 3 and callout 4 in Figure5-2, slide the cable clamp forward until it is flush against the edge of the connector, and then use the anti-disconnection clip to secure the power cord plug..

Figure5-2 Connecting an AC power cord

4. Connect the other end of the power cord to an AC power source, and then turn on the circuit breaker.

Connecting a DC power cord

1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.

2. Insert the power cord connector into the receptacle.

The power cord connector and the receptacle form a disorientation rejection structure. Make sure the orientation of the connector is correct. As a best practice, use a torque of 0.25 Nm to fasten the screws.

Figure5-3 Connecting a DC power cord

3. Connect the other end of the power cord to a DC power source, and then turn on the circuit breaker.

Connecting an RJ-45 serial port cable or RJ-45 twisted pair cable

The RJ-45 serial cable is used to connect the CONSOLE port on the NR main control and baseband module to the maintenance terminal, thus allowing access to the device's CLI. In practical networking, the CONSOLE port is generally used for problem localization.

The functions of the RJ-45 twisted pair cable include:

· Connecting the MANAGEMENT port on the NR main control and baseband module to the network management system.

· Connecting the MANAGEMENT port on the NR main control and baseband module to the maintenance terminal, in order to log in to the local Web management page of the device.

· Connecting the 1PPS+TOD port on the NR main control and baseband module to the clock source, for the transmission of clock signals.

· Connecting the 1PPS+TOD port on the NR main control and baseband module to subordinate clock devices, for the transmission of clock signals.

· Connecting the MON port on the power supply module to the environmental monitoring instrument, for the transmission of environmental monitoring signals.

NOTE:

The BBU5200 does not currently support sending device environmental information to the environmental monitoring instrument through the MON interface of the power module.

For the supported RJ-45 serial cables, twisted pair cables, and their specifications, see the hardware information and specifications, the user manual for the NR main control and baseband module, and the user manual for the power module.

Both the serial cable and twisted pair cable use RJ-45 type connectors, and their connection methods are the same. The manuals provide examples using an Ethernet twisted pair cable connected to the MANAGEMENT port for illustration.

To connect a twisted pair cable:

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Insert the twisted pair cable into the RJ-45 port.

Figure5-4 Connecting a twisted pair cable

Connecting optical fibers

CAUTION:

· Before connecting an optical fiber, make sure the received optical power does not exceed the upper receive power threshold of the transceiver module. If the threshold is exceeded, the transceiver module might be damaged.

NOTE:

· To connect an optical fiber to a fiber port, make sure the fiber connector matches the transceiver module.

· To connect an optical fiber to a fiber port, first install a transceiver module in the fiber port.

The SFP+ backhaul port or eCPRI fronthaul port of the NR main control and baseband module uses optical fiber as the cable. Before connecting the optical fiber, optical modules must be installed on the interfaces. For detailed instructions on installing optical modules, see "Installing a transceiver module."

Optical fibers are connected to the SFP+ backhaul port optical modules or eCPRI fronthaul port optical modules using LC-type connectors. For the supported optical modules and fiber specifications, see the hardware information and specifications, or the user manual for the NR main control and baseband module.

To connect an optical fiber to a transceiver module by using an LC connector:

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Remove the dust plug from the fiber port and clean the fiber end.

Figure5-5 Removing a dust plug from the fiber port

3. Identify the Rx and Tx ports on the transceiver module. Use the optical fiber to connect the Rx port and Tx port on the transceiver module to the Tx port and the Rx port on the peer device, respectively.

Figure5-6 Connecting an optical fiber

Connecting a clock signal cable

Connect the SMA male connector of the clock signal cable to the GNSS port on the device NR main control and baseband module. For information about specifications of the clock signal cables, see the hardware information and specifications or NR main control and baseband module user guide.

To connect a clock signal cable:

1. Wear an ESD wrist strap. Make sure the wrist strap makes good skin contact and is reliably grounded.

2. Connect the SMA male connector of the clock signal cable to the GNSS port on the device NR main control and baseband module, and fasten the hex nut on the SMA male connector.

As a best practice, use a torque of 0.9 Nm to fasten the hex nut.

Figure5-7 Connecting a clock signal cable

6 Installing an antenna feeder system

About the antenna feeder system

Choose a clock signal cable as follows:

· Connect a BBU and a power divider with an SMA female connector—An SMA male connector at both ends.

· Connect a BBU and an SPD or power divider with a Type-N male connector—An SMA male connector and a Type-N female connector.

· For scenarios where the BBU connects to an N-type female power splitter via a clock signal transfer cable, select one end with an SMA male connector and the other end with an N-type male connector.

This section connects a clock signal cable to an SPD.

You must install a GNSS antenna feeder system when the station uses GNSS as the clock source. As shown in Figure6-1, a GNSS antenna system contains the following components:

· GNSS antenna.

· SPD.

· Feeder.

· (Optional.) Power divider.

· (Optional.) Relay amplifier.

Figure6-1 Antenna system

Installing a GNSS antenna

NOTE:

· The manual uses the GNSS antenna with the product code SL10879B as an example to introduce the installation process of the GNSS antenna.

· If you are using a GNSS antenna of a different model, see the installation guide for that specific antenna for the corresponding installation steps.

GNSS antenna components

Figure6-2 GNSS antenna components

Installing a GNSS antenna

1. As shown in Figure6-3, connect the GNSS antenna to the feeder cable, and then tighten the feeder cable connector clockwise to ensure a secure connection to the GNSS antenna body.

Figure6-3 Connecting the GNSS antenna body to the feeder cable

2. See the waterproofing method introduced in "Waterproofing the cables" to process the junction between the GNSS antenna and the feeder cable connector.

3. First, thread the feeder cable through the support tube, as shown in Figure6-4, then insert the support tube into the GNSS antenna body and tighten the support tube clockwise to ensure a tight connection to the GNSS antenna body.

Figure6-4 Connecting the support tube to the GNSS antenna body

4. As shown in Figure6-5, pass the support tube through the small hoop of the GNSS clamp, then use an adjustable wrench to secure the hex nut at the small hoop. Next, use a screwdriver to tighten the screw on the small hoop clockwise. Repeat this step to tighten the screw on the other side of the small hoop until the GNSS clamp is firmly attached to the support tube.

Figure6-5 Securing the GNSS clamp to the support tube

5. As shown in Figure6-6, pass the GNSS clamp through the support rod, then use an adjustable wrench to secure the hex nut at the large hoop. Next, use a screwdriver to tighten the screw on the large hoop clockwise. Repeat this step to tighten the screw on the other side of the large hoop until the GNSS clamp is firmly attached to the support rod.

Figure6-6 Securing the GNSS clamp to the support rod

Installing an SPD

About SPDs

An SPD protects devices from overvoltage caused by induced lightning strokes.

Figure6-7 SPD

(1) Surge terminal (Type-N female connector)	(2) Protect terminal (Type-N male connector)
(3) Grounding screw (M8)

Installing an SPD on the device

Connect the protect terminal to the clock signal cable and the surge terminal to the feeder.

To connect the SPD and clock signal cable:

1. Wear a pair of antistatic gloves.

2. Connect the Type-N male connector on the protect terminal of the SPD to the clock signal cable connector and fasten the nut on the Type-N male connector.

As a best practice, use a torque of 4 Nm to fasten the nut.

Figure6-8 Connecting the SPD and clock signal cable

To connect the SPD and feeder:

1. Wear a pair of antistatic gloves.

2. Connect the Type-N male connector of the feeder to the surge terminal of the SPD, and then fasten the nut on the Type-N male connector.

As a best practice, use a torque of 4 Nm to fasten the nut.

Figure6-9 Connecting the SPD and feeder

Installing an SPD on the GNSS antenna

Install the SPD as close to the GNSS antenna as possible. Connect the protect terminal to the GNSS antenna and surge terminal to the feeder. The connection procedure is the same as that for installing an SPD on the device. For more information, see "Installing an SPD on the device."

Grounding the SPD

1. Wear a pair of antistatic gloves.

2. Secure one end of the grounding cable to the SPD. As a best practice, use a torque of 11 Nm.

3. Secure the other end to a grounding strip. For more information, see "Grounding the device."

Figure6-10 Grounding an SPD

7 Verifying the installation

Rack installation checklist

Table7-1 Rack installation checklist

No.	Item
1	Check if the location of the cabinet matches the design drawings.
2	Check if the cabinet base is securely installed.
3	Check if the cabinet bolts are tightened (pay special attention to the electrical connections), and ensure that flat washers and spring washers are complete and correctly installed.
4	Check the cabinet for cleanliness. If there is dust, debris, etc., it should be cleaned promptly.
5	Check if the cabinet's exterior paint is intact. If there is chipping, it needs to be repainted immediately to prevent corrosion.
6	Check if all labels on the cabinet are correct, clear, and complete.
7	Check if there are any unused slots in the equipment. If so, install the corresponding blanking panels for those slots.
8	Check if there is sufficient space around the equipment for proper heat dissipation.

Wall-mounting checklist

Table7-2 Wall-mounting checklist

No.	Item
1	Check if the wall-mounted position of the equipment is consistent with the design drawings.
2	Inspect whether the wall is solid and secure.
3	Inspect if the wall-mount bolts of the equipment are tightened, paying special attention to the electrical connections. Ensure that flat and spring washers are all present and properly installed.
4	Check if the environment where the equipment is located is clean. If there is dust, trash, or other debris, it should be cleaned up promptly.
5	Check if there are any unused slots on the device, and if so, install the corresponding blank panel for those slots.
6	Check if there is enough space around the device for adequate heat dissipation.

Electrical connections checklist

Table7-3 Electrical connections checklist

No.	Item
1	Use a multimeter to measure the resistance value of the grounding bar. The resistance value for the grounding of the computer room engineering should be less than 1 ohm.
2	If using a self-made protective ground wire, it must be made of copper core cable, and the wire gauge must meet the requirements. There should be no switches, fuses, or other disconnectable devices set within the cable, and there should be no short-circuit occurrences.
3	See the power system's circuit diagram to check whether the grounding wire is securely connected, the AC feed line and cabinet wiring are correctly connected, and screws are tightened, ensuring there are no short circuits in the input or output.
4	When the power line or ground wire is too long, it should not be coiled; instead, the excess length should be cut off.
5	To use self-made power lines and ground wire terminals, make sure the terminals are firmly soldered or crimped.
6	The exposed wire at the terminal connection and the terminal handle should be covered with heat-shrink tubing and must not be exposed.
7	At each OT terminal, there should be a flat washer and a spring washer installed to ensure a secure fit, preventing deformation at the terminal contact surface and ensuring good contact.

Cable connection checklist

Table7-4 Cable connection checklist

No.	Item
1	Check the cable connections according to the cable layout requirements in the manual.
2	Excessive optical attenuation in fiber links can affect communication quality. There are various causes for high optical attenuation, common ones include: · Contaminated fiber end-faces · Excessive bending of fibers · Non-standard fiber splicing · Lack of proper protection at the splice point, such as not installing a splice protector Use an optical power meter to check and record the attenuation values of each fiber link. For links with excessive attenuation, investigate and rectify the issue promptly. IMPORTANT: The effectiveness of the transmission link is ensured only when the theoretical minimum output power of the far end minus the theoretical minimum receive power of the near end is greater than the actual attenuation value. For details on the theoretical minimum output power and minimum receive power of optical modules, see the optical module manual or the hardware description of the product. For H3C small stations, it is recommended that the actual link attenuation value be less than 6.2dB.

No.

Item

Check the cable connections according to the cable layout requirements in the manual.

Excessive optical attenuation in fiber links can affect communication quality. There are various causes for high optical attenuation, common ones include:

· Contaminated fiber end-faces

· Excessive bending of fibers

· Non-standard fiber splicing

· Lack of proper protection at the splice point, such as not installing a splice protector

Use an optical power meter to check and record the attenuation values of each fiber link. For links with excessive attenuation, investigate and rectify the issue promptly.

IMPORTANT:

The effectiveness of the transmission link is ensured only when the theoretical minimum output power of the far end minus the theoretical minimum receive power of the near end is greater than the actual attenuation value.

For details on the theoretical minimum output power and minimum receive power of optical modules, see the optical module manual or the hardware description of the product.

For H3C small stations, it is recommended that the actual link attenuation value be less than 6.2dB.

8 Accessing the web management interface of the device

You can log in from the Web interface to manage the device for the first time.

Web browser requirements

· As a best practice, use the following Web browsers:

¡ Internet Explorer 10 or later.

¡ Firefox 59 or later.

¡ Chrome 55 or later.

· Configure the Web browser to accept the first-party cookies from Web sites and enable active scripts or JavaScript. Names and configurations vary by the Web browser.

· To use Internet Explorer, you must also enable the following security settings:

¡ Execute scripts for ActiveX controls that are marked as secure scripts.

¡ Run ActiveX controls and plug-ins.

· After a device software version change, clear the browser cache to make sure the Web interface displays correct information.

Restrictions and guidelines

· Enter a correct username and password. If you have two consecutive password failures, you must provide the verification code to log in again.

· The device has an administrator account when shipped. The username and password are both admin. For safety purposes, change the password after accessing the Web interface with the default account.

· The Web interface supports a maximum of 32 concurrent users.

Logging in to the Web interface for the first time

You can use HTTPS to log in to the Web interface of the device.

When the device was shipped, HTTPS was enabled and the following settings were configured:

· IP address of the management interface—192.168.101.100/24

· Username—admin

· Password—admin

To log in to the Web interface:

1. Use an Ethernet shielded twisted pair cable to connect a maintenance terminal to the management interface on the device.

Figure8-1 Connecting a maintenance terminal to the device

2. Assign the maintenance terminal an IP address in the same subnet as the device. This document uses IP address 192.168.101.2/24 as an example for the maintenance terminal.

3. Open the browser and enter the IP address of the device management interface in the https://ip-address:port format in the address bar.

The ip-address argument represents the IP address of the device management interface. The port argument represents the HTTPS port number. The default port number is 443 for HTTPS. You do not need to enter the port number if you have not changed the service port setting.

4. Log in to the Web interface.

a. On the login page, enter the default username admin and password admin and click Login.

b. In the dialog box that opens, change the default password and click OK.

NOTE:

As a best practice, use a password that contains characters from the following categories: digits, upper-case letters, lower-case letters, and special characters ~`!@#$%^&*()_+-={}|[]\:”;’<>,./

c. Enter the new username and password and then click Login.

Logging out of the Web interface

IMPORTANT:

· For security purposes, log out of the Web interface immediately after you finish your tasks.

· Closing the browser directly does not immediately log the user out of the Web. The system will automatically log out the user after a certain period of time.

· The device does not automatically save the configuration when you log out of the Web interface. To prevent configuration loss when the device reboots, you must save the configuration. The base station supports the following methods for saving configuration:

¡ Click the icon at the top right of the page.

¡ Access the configuration management page of the BBU Web from the system tools menu, click the backup and restoration tab, and then click Save Current Configuration.

To log out of the Web interface, click the admin icon and then click Logout.

9 Maintaining the device

IMPORTANT:

· Do not touch the components on the surface of pluggable modules with your hands directly to avoid electrostatic damage.

· If there is a need to relocate the equipment in the future, it is recommended to properly store the blank panels and the packaging boxes and bags of pluggable modules for future use.

· To prevent dust from entering and ensure normal ventilation and heat dissipation during operation, make sure all pluggable module slots are occupied. Install the corresponding modules or blank panels without fail.

· When removing the wall-mounted device's fan modules, power modules, NR main control and baseband modules, there is a risk of modules falling after loosening the screws. Hold the modules by hand to prevent accidental drops and damage.

Replacing a fan tray

WARNING!

· Ensure electricity safety when replacing a fan tray during device operation.

· To avoid injury, do not touch the rotating fan blades.

· To avoid disturbing the dynamic balance of a fan tray and causing loud noises, do not touch the fan blades and rotation axis even if the fan tray stops rotating.

· During the operation of the device, if a fan module fails, it is imperative to replace the faulty fan module within 30 seconds, and the faulty fan module must remain in place before the replacement.

· When an internal circuit or component of a fan tray is faulty, contact H3C Support for repair. Do not remove the components yourself.

To replace a fan tray:

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. As shown in ① of Figure9-1, use a Phillips screwdriver to align with the screw on the fan module. Rotate counterclockwise until the screw is completely detached from the equipment.

3. As shown in ② of Figure9-1, grasp the handle on the fan module with one hand, and pull the fan tray part way out of the slot. Supporting the fan tray bottom with the other hand, gently pull the fan tray along the guide rails out of the slot.

Figure9-1 Removing a fan tray

4. Put the removed fan tray in an antistatic bag or on an ESD workbench for better protection.

5. To install a new fan tray, see "Installing a fan tray."

Replacing power modules

WARNING!

To avoid device damage or bodily injury, strictly follow the removal procedure in Figure9-2 to remove a power module.

CAUTION:

· The equipment supports both DC and AC power module types, but mixing them is not allowed.

· Put the removed power module in an antistatic bag for future use.

· For adequate heat dissipation and dust prevention, install a filler panel in a power module slot if you are not to install a new power module in the slot after removing the old one.

Figure9-2 Removal procedure

Replacing an AC power module

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Turn off the power module switch and the circuit breaker.

3. Disconnect the power cord from the power source.

4. As shown by callout 1 and callout 2 in Figure9-3, release the jaw of the cable clamp and open the cable clamp.

5. As shown by callout 3 in Figure9-3, disconnect the power cord connector from the power module receptacle.

Figure9-3 Disconnect an AC power cord

6. As shown in ① of Figure9-4, use a Phillips screwdriver to align with the screw on the power module. Rotate counterclockwise until the screw is completely detached from the equipment.

7. As shown in ②of Figure9-4, grasp the handle on the power module with one hand, and pull the power module part way out of the slot. Supporting the power module bottom with the other hand, gently pull the power module out of the slot.

Figure9-4 Removing an AC power module

8. Put the removed power module in an antistatic bag or on an ESD workbench for better protection.

9. To install a new power module, see "Installing a power module."

Replacing a DC power module

1. Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded.

2. Turn off the power module switch and turn off the circuit breaker.

3. Disconnect the power cord from the power source.

4. Loose the screws on the DC power cord connector, as shown by callout 1 in Figure9-5.

5. Disconnect the power cord connector from the power module receptacle, as shown by callout 2 in Figure9-5.

Figure9-5 Disconnecting a DC power cord

6. As shown in ① of Figure9-6, use a Phillips screwdriver to align with the screw on the power module. Rotate counterclockwise until the screw is completely detached from the equipment.

7. As shown in ②of Figure9-6, grasp the handle on the power module with one hand, and pull the power module part way out of the slot. Supporting the power module bottom with the other hand, gently pull the power module out of the slot.

Figure9-6 Removing a DC power module

8. Put the removed power module in an antistatic bag or on an ESD workbench for better protection.

9. To install a new power module, see "Installing a power module."

Replacing an NR main control and baseband module

IMPORTANT:

When the equipment is in operation and there is a need to install or remove an NR main control and baseband module, you should first power down the entire device. Only after the NR main control and baseband module has been installed or removed should you power up and restart the equipment.

If the RUN LED on the NR main control and baseband module is solid green or flashing green rapidly (4Hz), it indicates that the NR main control and baseband module is in the process of starting up. Do not attempt to disassemble the NR main control and baseband module while it is starting up.

To replace an NR main control and baseband module:

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Remove the cables and optical modules from the NR main control and baseband module.

3. As shown in ① of Figure9-7, use a Phillips screwdriver to align with the screws on the NR main control and baseband module to be disassembled, and rotate counterclockwise until the screws are completely loosened.

4. As shown in ② and ③ of Figure9-7, grasp the handle of the NR main control and baseband module with your hand, pull it outward to disconnect the plug from the backplane, and then slowly slide the NR main control and baseband module out of the slot along the guide rails, until it is completely removed from the slot.

Figure9-7 Replacing an NR main control and baseband module

5. After the NR main control and baseband module is removed, for better protection, place it with the component side facing up on an anti-static workbench or insert it into an anti-static bag.

6. To install a new NR main control and baseband module, see "Installing an NR main control and baseband module" for detailed instructions.

Replacing a transceiver module

CAUTION:

Do not touch the golden plating on a transceiver module.

To replace a transceiver module:

1. Wear an ESD wrist strap or antistatic gloves. If you wear an ESD wrist strap, make sure it makes good skin contact and is reliably grounded.

2. Remove the optical fibers from the transceiver module. There is a latching mechanism between a fiber connector and transceiver module port to prevent connector disengagement. Release the latching mechanism before removing the optical fiber. To avoid damages, do not use excessive force.

3. As shown by callout 1 in Figure9-8, pivot the bail latch down to the horizontal position. Otherwise, the tab and clip in the fiber port might be damaged.

4. Hold the bail latch to pull the module out of the slot. Make sure you apply force in the direction parallel to the ground. To avoid damaging the bail latch, do not use excessive force. If you apply force at an angle when pulling the module out, you can hardly pull the module out and the module or fiber port might be damaged.

Figure9-8 Removing a transceiver module

5. Put the removed transceiver module in an antistatic bag or on an ESD workbench for better protection.

6. To install a new transceiver module, see "Installing a transceiver module."

10 Troubleshooting

Fan tray failure

You can determine if there is a fault with the fan module by referring to the status LED on the fan module or the alarm information displayed on the network management page. For detailed information on the fan module status LED, see the product hardware description or the fan module's user manual.

NOTE:

After confirming that the selected fan module model is correct and the fan module is well connected with the device, if the fan module status LED still shows abnormalities, contact the distributor or local service engineer for further troubleshooting and handling.

When a fan module fails, users can replace it following the method described in "Replacing a fan tray."

Power module failure

You can determine if there is a fault with the power supply module by referring to the status LED on the power supply module or the alarm information displayed on the network management page. For detailed information on the power supply module status LED, see the product hardware description or the power supply module's user manual.

NOTE:

Once it has been confirmed that the selected power supply module model is correct and the power supply module is well connected to the device, if the power supply module status LED still displays abnormalities, contact the distributor or the local service engineer for further problem diagnosis and resolution.

When the power supply module fails and needs replacement, users can replace it using the method described in "Replacing power modules."

NR main control and baseband module failure

You can determine if there is a fault with the NR main control and baseband module by referring to the status LED on the module or the alarm information displayed on the network management page. For detailed information on the NR main control and baseband module status LED, see the product hardware description or the user manual for the NR main control and baseband module.

NOTE:

After ensuring that the chosen NR main control and baseband module model is correct and that the module is properly connected with the device, if the NR main control and baseband module status LED still shows abnormalities, contact the distributor or the local service engineer for further identification and resolution of the issue.

When the NR main control and baseband module malfunctions, users can replace it following the method described in "Replacing an NR main control and baseband module."

H3C BBU5200 Baseband Unit Installation Guide-5W101

1 Preparing for installation

Safety recommendations

Lightning protection

Lightning protection for the device

Lightning protection for the GNSS antenna

3 Installing the device

Grounding the device

4 Installing removable components

Installing a power module

Installing an AC power module

Installing a DC power module

Installing an NR main control and baseband module

Installing a transceiver module

5 Connecting cables

Connecting an AC power cord

Connecting an RJ-45 serial port cable or RJ-45 twisted pair cable

6 Installing an antenna feeder system

GNSS antenna components

Installing an SPD

Replacing a fan tray

Replacing power modules

Fan tray failure

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