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.

Safety signs

IMPORTANT:

Anti-scald warning label. If the device is labeled with this label, it indicates that the surface of the electrical device may generate high temperature during operation. Please install the device in a restricted access area. Only maintenance personnel or trained personnel can access the equipment in the restricted area, and general personnel should not touch it to prevent scalding.

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.

· 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.

· Do not place the device and installation tools in the walking area.

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.

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, remove all removable components (such as transceiver modules) and place them separately in antistatic bags. 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.

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.

Device installation general requirements

· Do not use plastic zip ties to directly tie devices or installations.

· Ensure that the dimensions of the cement roof/wall/keel/round rod/hanger meet the installation requirements and are strong enough to support the weight of the equipment and its installation accessories by four times.

· Device installation must be firm and reliable, and cannot be placed arbitrarily in the suspended ceiling. The installation requirements for devices with integrated antennas must be neatly arranged.

· The installation parts of the device should be metal, all support parts should be strong and firm, iron rods should be vertical, crossbars should be horizontal, all iron materials should be anti-oxidized, installed in places that are not easily accessible to people, ensuring easy maintenance and inspection.

· Try to minimize the number of obstacles (e.g. walls) between devices and user terminals.

· Keep the installation location of the device away from electronic devices or equipment that may generate radio frequency noise.

· The device should be installed in a location that is not directly accessible to people to prevent burns from the high temperature of the device during operation. The installation location should be as concealed as possible, without hindering the daily work and life of residents.

· The installation site should be dry, with minimal dust, and well-ventilated. Flammable items should not be placed indoors.

· Installation in environments with stagnant water, seepage, leaks, condensation, etc. is strictly prohibited, and care must be taken to prevent water droplets from flowing into the device along the cable due to cable condensation or seepage.

· Do not install the device near strong heat source equipment or fire equipment such as heat, smoke, and fire sprinklers. In principle, it should be at least 1 meter away. It is prohibited for the air conditioning heat dissipation box or other heat dissipation electrical equipment to face the device directly.

· When the device is equipped with a built-in (integrated) antenna, it should also meet the installation requirements of the antenna.

· For special requirements in each installation scenario, see the specific installation process.

Installation space requirements

The recommended installation space specifications for the device are as shown in Figure1-1.

Figure1-1 Recommended space specifications

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.

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.

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 Table1-1.

Table1-1 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 Table1-2.

Table1-2 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 Table1-3.

Table1-3 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.

· 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.

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.

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.

· In order to facilitate on-site cable hiding, the stripping length can be appropriately increased.

· 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.

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.

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.

Antenna deployment requirements

· The installation location of the external antenna should ensure no interference from strong electrical, magnetic, and corrosive devices.

· The overall layout of the external antenna should be reasonable and beautiful. During the installation of the antenna, the ceiling or other facilities must not be dirtied. More waterproof adhesive tape must be used for the outdoor antenna connector, then wrapped with plastic black adhesive tape. The tape should be flat, with few wrinkles, and aesthetically pleasing. After the antenna is installed, it should be wiped clean.

· The installation bracket for the external antenna should be made of metal and treated for rust prevention. The antenna must be installed in a place that is not easily accessible by hand, but should be easily accessible for maintenance checks on other components.

· Omni-directional ceiling mount antennas, wall-mounted antennas, etc. should be securely installed on the ceiling or wall using antenna mounting brackets. Directional panel antennas should be installed using wall-mounted or directional antenna bracket installation methods, and the main lobe of the antenna should be oriented towards the target coverage area. Antennas should be placed as far away as possible from fire sprinkler heads.

· The installation of ceiling-mounted antennas must be firm, reliable, and ensure the antenna is level. When installed under the ceiling, it should not corrupt the overall indoor environment; when installed inside the suspended ceiling, a maintenance reservation should be made.

· When installing an omnidirectional antenna, ensure the antenna is vertical, and the vertical deviation shall not exceed ±1° in all directions; The directional antenna's orientation angle should comply with the design requirements of the construction drawing, and the installation directional deviation should not exceed ±5% of the antenna half-power angle.

· Within 1 meter around the antenna, there should not be large obstacles. The antenna should be installed away from nearby metal structures to reduce signal blockage. The antenna should not be installed inside a metal suspended ceiling.

· For a dual-channel spatial division system using two single-polarized antennas, the installation deviation of the antenna spacing should not exceed 5% of the design document (plan); if not specified in the design document (plan), it should not be less than 4λ, preferably controlled between 4λ-12λ.

· For the distributed antenna system using dual-polarized antennas, the polarization isolation and cross-polarization ratio of indoor antennas should meet the requirements in the table below.

Antenna type	Polarization isolation (dB)	Cross-polarization ratio (dB)
Ceiling Mount Antenna with Omni-Directional Dual Polarization	≥25	≥10
Wall Mount Antenna with Directional Dual Polarization	≥25	≥15
Low Intermodulation Indoor Distributed System Antenna	≥35	≥10

· The distance between the antenna and the Wi-Fi antenna should be greater 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
Main installation		Provided	——
Expansion tube and screws		Provided	4 pairs
Limiting screws		Provided	2
Auxiliary installation		Optional	For main structural beam and round rod mounting scenes
M4X 30mm screws		Optional	For main structural beam mounting scenes, if needed, at least 2 pairs
M4X 60mm screws		Optional	For main structural beam mounting scenes, if needed, at least 2 pairs
M4X 8mm screws		Optional	For round rod mounting scenes, if needed, at least 2 pairs
Long band clamp		Optional	For round rod mounting scenarios
Short band clamp		Optional	For round rod mounting scenarios
Hybrid copper-fiber cable		Optional or user-provided	When opting for the hybrid copper-fiber cable, bare wires, RJ-45 power connectors, and LC fiber connectors need to be purchased separately for on-site wiring. For detailed information on bare wires and connectors, see the hardware description of the product

3 Installing the device

pRRU5214 is only suitable for indoor installation, supports the following installation methods, please select the appropriate method to install the device according to the site conditions. This manual takes the external antenna model as an example to introduce the installation process of the device.

· Wall-mounting the device

· Ceiling-mounting the device

· Installing the device closely with the main structural beams

· Installing the device to the round rod

· Installing the device to a hanger

The device installation process is as shown in Figure3-1.

Figure3-1 Installation flowchart

Pre-installation check

Before installing the pRRU, please perform the following checks:

· First power on the pRRU, connect the pRRU to the network, check the status of the indicator lights, confirm that the pRRU can work properly, and refer to the product hardware description for the device indicator light status.

· Please acknowledge that the wiring work has been completed at the installation site.

Wall-mounting the device

1. As shown in Figure3-2, follow the steps below to secure the expansion screw to the wall.

a. Place the main mounting bracket in the designated installation position, flush against the wall, and use a marker to identify the position of the mounting screw holes. It is important to ensure that the UP arrow mark on the mounting bracket is facing upwards.

b. Use a hammer drill to drill four 5.5mm diameter holes at the marked locations, ensuring that the drilled holes correspond to the mount points on the main installation piece.

c. Insert the expansion screw into the drilled hole on the wall, use a rubber hammer to tap one end of the expansion screw until it is completely tapped into the wall.

Figure3-2 Fixed expansion screw pipe

2. Turn the limit screw in a clockwise direction onto the main mounting piece. It is important to note that you only need to hang the screw on the main mounting piece, and do not screw it in too deeply, otherwise it will hinder the installation of the device onto the main mounting piece. When unable to install two limit screws due to installation restrictions, make sure to install at least one limit screw onto the main mounting piece.

Figure3-3 Secure the limit screw to the main installation part

3. Insert the screws that come with the expansion screw into the corresponding mountingholes, adjust the position of the main mounting piece, and tighten the screws clockwise using a screwdriver to fix the main mounting piece to the wall.

Figure3-4 Secure the mounting bracket to the wall.

4. Following the steps below, secure the device to the wall.

IMPORTANT:

Before fixing the equipment, please acknowledge whether it is necessary to connect the device cable in advance to prevent insufficient space from causing inconvenience or even inability to connect the cable.

a. Align the screws and hooks on the back of the device with the gourd holes on the main mounting bracket on the wall, insert the screws and hooks into the gourd holes on the main mounting bracket, then press down on the device in the opposite direction of the UP arrow on the main mounting bracket to hang the device on the main mounting bracket.

Figure3-5 Secure the device to the main mounting bracket

b. Tighten the limit screw on the mounting piece clockwise to prevent the device from slipping. The screw should be tightened to a depth where it is not visible from the front of the device.

Figure3-6 Tighten the limit screw

IMPORTANT:

Verify that the AP is installed securely to prevent it from falling off.

Ceiling-mounting the device

NOTE:

You can install the pRRU on the indoor concrete ceiling. Because the pRRU device is heavy and does not support direct installation on the decorative ceiling, you can use the method of hugging the keel to install the device on the ceiling keel.

1. As shown in Figure3-7, follow the steps below to secure the expanded screw tube to the cement roof.

a. Place the main mounting bracket in the designated installation position, close to the cement ceiling, and use a marker to mark the position of the holes where the mounting screws are needed.

b. Use a hammer drill to make 4 5.5mm diameter holes at the marked positions, and the drilled holes should correspond to the mounting points on the main mounting piece.

c. Insert the expansion screw into the hole drilled on the cement ceiling, use a rubber hammer to hit one end of the expansion screw until it is fully hammered into the wall.

Figure3-7 Fix the expanding screw pipe to the cement top

2. In the clockwise direction, screw the limit screw onto the main mounting part. It is important to note that you only need to hang the screw on the main mounting part, do not screw it in too deeply, otherwise it will hinder the installation of the device onto the main mounting part. When unable to install two limit screws due to installation position restrictions, make sure to install at least one limit screw onto the main mounting part.

Figure3-8 Secure the limit screw to the main mounting component

3. Pass the screws matched with the expansion screw through the corresponding mounting holes, adjust the position of the main mounting part, use a screwdriver to tighten the screws clockwise, and fix the main mounting part to the concrete roof.

Figure3-9 Install the fixed mounting bracket to the cement ceiling

4. According to the following steps, secure the device to the cement roof.

IMPORTANT:

Before fixing the equipment, please confirm whether it is necessary to connect the device cable in advance to prevent inconvenience or even inability to connect due to insufficient space.

a. Align the screws and hooks on the back of the device with the gourd holes on the main mounting bracket, insert the screws and hooks into the gourd holes on the main mounting bracket, then horizontally push the device along the opposite direction of the UP arrow on the main mounting bracket to hang the device on the main mounting bracket.

Figure3-10 Secure the device to the mounting bracket

b. Tighten the limit screw on the main mounting piece clockwise to prevent the device from slipping. The screw should be tightened to a depth where it is not visible from the front of the device.

Figure3-11 Secure the device to the cement ceiling

IMPORTANT:

Verify that the AP is installed securely to prevent it from falling off.

Installing the device closely with the main structural beams

NOTE:

· If the survey confirms that the site needs to use the hugger installation method, auxiliary installation parts need to be selected.

· Please select the screw for panel installation according to the thickness of the ceiling. If the ceiling thickness is less than 20mm, it is recommended to use M4×30mm screws; if the ceiling thickness is 20mm to 45mm, it is recommended to use M4×60mm screws. This manual uses M4×60mm screws as an example.

1. Place the main mounting bracket in the designated installation position, close to the ceiling, and mark the positions where mounting screws are needed with a marker.

Figure3-12 Mark the installation location

2. Use a hand drill to drill two 5.5mm diameter holes at the marked position, and the drilled holes should correspond to the mounting points on the main mounting bracket.

Figure3-13 Drill holes in the ceiling

3. Turn the limit screw clockwise onto the main mounting bracket. It is important to note that the screw only needs to be hung on the main mounting bracket, and should not be screwed in too deeply, otherwise it will hinder the device from being installed on the main mounting bracket. When unable to install two limit screws due to installation restrictions, make sure to install at least one limit screw onto the main mounting bracket.

Figure3-14 Secure the limit screw to the main mounting part

4. Place the auxiliary mounting part above the keel, pass two M4×60mm screws through the mounting holes on the main mounting part and the drilled holes on the ceiling, align with the mounting holes of the auxiliary mounting part, and then use a screwdriver to tighten the screws clockwise to secure the main mounting part to the keel.

Figure3-15 Secure the fixed mounting bracket to the keel

5. According to the following steps, secure the device to the keel.

IMPORTANT:

Before fixing the equipment, please acknowledge if it is necessary to connect the all-in-one cable in advance to prevent insufficient space from causing inconvenient or even impossible cable connection.

a. Align the screws and hooks on the back of the device with the hoisting holes on the main mounting bracket, and insert the screws and hooks into the hoisting holes on the main mounting bracket. Then, push the device horizontally in the opposite direction of the UP arrow on the main mounting bracket to hang the device on the main mounting bracket.

Figure3-16 Secure the device to the mounting bracket

b. Tighten the limit screw on the main mounting part clockwise, and clamp the hook to prevent the device from slipping. The depth of the screw should be such that it is not visible from the front of the device.

Figure3-17 Secure the device to the keel

IMPORTANT:

Verify that the AP is installed securely to prevent it from falling off.

Installing the device to the round rod

NOTE:

If the engineering and exploration confirm that the site needs to be installed with a pole mounting method, then it is necessary to select the appropriate auxiliary installation parts and band clamps.

Introduction to the main and auxiliary installation methods

As shown in Figure3-18, there are two ways to combine the main and auxiliary mounting parts, and users can flexibly choose based on the thickness of the round bar and the angle of the round bar installation. To achieve a better fastening effect, it is recommended to choose the combination of main and auxiliary mounting parts according to the following principles.

· When the combination assembly is fixed to a smaller round bar (with a reference diameter of 12-70mm), the long side of the auxiliary assembly is parallel to the round bar, and a short band clamp is generally used for fixation.

· When the combined installation component is fixed to a larger round bar (with a reference diameter of 70-112mm), the short side of the auxiliary installation component is parallel to the round bar, and generally, a band clamp is used for fixation.

Figure3-18 Main and auxiliary installation component combination method

This manual introduces the installation of the device on narrow vertical and horizontal round bars as examples.

Installing the device on a vertical round rod

1. Follow the steps below to preprocess the installation component.

a. Align the two holes on the auxiliary mounting bracket with the parallel two holes on the main mounting bracket, then pass the M4×8mm screw through the aligned holes, use a screwdriver to tighten the screw clockwise to secure the main mounting bracket and the auxiliary mounting bracket together.

Figure3-19 Combined main and auxiliary installation parts

b. Turn the limit screw in a clockwise direction onto the main mounting piece. It is important to note that the screw only needs to be hung on the main mounting piece, and should not be screwed in too deeply, otherwise it will hinder the installation of the device onto the main mounting piece. When it is not possible to install two limit screws due to installation restrictions, make sure to install at least one limit screw onto the main mounting piece.

Figure3-20 Secure the limit screw to the main installation part

2. Follow the steps below to secure the combination installation parts to the vertical pole.

a. Thread the band clamp through the mount points of the assembled mounting piece.

Figure3-21 Thread the band clamp through the mounting bracket.

b. Put the band clamp on the round bar, and use a screwdriver to tighten the band clamp screw clockwise to secure the band clamp, and then fix the assembly bracket to the vertical round bar.

Figure3-22 Attach the fixed combination installation component to the vertical round bar

3. Following the steps below, secure the device to the vertical pole.

IMPORTANT:

Before securing the equipment, please confirm if it is necessary to connect the device cable in advance to prevent insufficient space from causing inconvenience or even preventing the cable connection.

a. Align the screws and hooks on the back of the device with the hoist holes on the main mounting bracket, insert the screws and hooks into the hoist holes on the main mounting bracket, then press down on the device in the opposite direction of the UP arrow on the main mounting bracket, and hang the device on the main mounting bracket.

Figure3-23 Fix the device to the main installation component

b. Tighten the limit screw on the main mounting piece clockwise, and clamp the hook to prevent the device from slipping. It is advisable to screw in the depth so that the limit screw is not visible from the front of the device.

Figure3-24 Tighten the limit screw

Installing the device on a horizontal round bar

1. Preprocess the installation components according to the following steps.

a. Align the two holes on the auxiliary mounting bracket with the parallel two holes on the main mounting bracket, then pass the M4×8mm screw through the aligned holes, use a screwdriver to tighten the screw clockwise, securing the main mounting bracket and the auxiliary mounting bracket together.

Figure3-25 Combination main and auxiliary mounting parts

b. Clockwise direction to screw the limit screw onto the main mounting part. It is important to note that the screw only needs to be hung on the main mounting part, and should not be screwed in too deeply, otherwise it will hinder the device from being installed on the main mounting part. When it is not possible to install two limit screws due to installation position restrictions, make sure to install at least one limit screw on the main mounting part.

Figure3-26 Secure the limit screw to the main mounting component.

2. Following the steps below, secure the assembly components to the horizontal round bar.

a. Thread the band clamp through the mount points of the assembly.

Figure3-27 Insert the band clamp into the band clamp fixture

b. Place the band clamp on the round bar, and use a screwdriver to tighten the band clamp screw clockwise to secure the band clamp, then fix the assembly bracket to the horizontal round bar.

Figure3-28 Attach the fixed mounting bracket to the round pole

3. Fix the device to the horizontal round bar according to the following steps.

IMPORTANT:

Before fixing the equipment, please confirm if it is necessary to connect the device cable in advance to prevent inconvenience or even inability to connect due to insufficient space.

a. Align the screws and hooks on the back of the device with the gourd holes on the main mounting bracket, insert the screws and hooks into the gourd holes of the main mounting bracket, then press down on the device in the opposite direction of the UP arrow on the main mounting bracket to hang the device on the main mounting bracket.

Figure3-29 Secure the device to the mounting bracket

b. Tighten the limit screw on the main mounting piece clockwise to prevent the device from slipping. The screw should be tightened to a depth where it is not visible from the front of the device.

Figure3-30 Tighten the limit screw

Installing the device to a hanger

1. Install hangers, the center distance between two hanger rods should be kept at 90mm.

Figure3-31 Installing the hanger

2. In a clockwise direction, screw the limit screw onto the main mounting part. It is important to note that you only need to hang the screw on the main mounting part, and do not screw it in too deeply, otherwise it will hinder the installation of the device onto the main mounting part. When it is not possible to install two limit screws due to installation position restrictions, make sure to install at least one limit screw onto the main mounting part.

Figure3-32 Secure the limit screw to the main mounting component

3. Install the nut, spring washer, flat washer, and main mounting component on the hanger, and tighten with a torque tool to a tightening torque of 5 N•m (M6) or 12 N•m (M8).

Figure3-33 Secure the main installation component to the hanger

4. According to the following steps, secure the device to the hanger.

IMPORTANT:

Before fixing the equipment, please acknowledge whether it is necessary to connect the device cable in advance to prevent insufficient space from causing inconvenient or even impossible cable connection.

a. Align the screws and hooks on the back of the device with the hoisting holes on the main mounting bracket, insert the screws and hooks into the hoisting holes on the main mounting bracket, then push the device horizontally in the opposite direction of the UP arrow on the main mounting bracket to hang the device on the main mounting bracket.

Figure3-34 Secure the device to the main installation component

b. Tighten the limit screw on the main installation piece clockwise to prevent the device from slipping. The screw should be tightened to a depth where it is not visible from the front of the device.

Figure3-35 Fix the device to the hanger

IMPORTANT:

Verify that the AP is installed securely to prevent it from falling off.

4 Installing removable modules

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.

The device mainly needs transceiver modules. 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 Figure4-2, remove the dust plug from the target fiber port.

3. As shown by callout 2 in Figure4-2, 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.

Figure4-2 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

Connecting hybrid copper-fiber cables

Once the equipment installation is complete, it should be connected to an FSW device (FSW5100 for this manual) using a hybrid fiber-optic and electrical cable. This connection enables data transfer and power supply between the equipment and the FSW device. Please prepare a well-assembled hybrid cable in advance. For the assembly method of the hybrid cable, refer to the product's hardware description.

IMPORTANT:

· Do not insert the optical module connected to the fiber directly into the device's optical port. Install the optical module first, then the fiber.

· Ensure the cleanliness of the fiber end face.

· Ensure the fiber is correctly connected to the Rx and Tx ports of the optical module.

Follow the steps below to connect the LC fiber connectors of one end of the hybrid fiber-optic and electrical cable to the device's SFP+ port.

1. Remove the dust cap from the SFP+ port and the protective cap from the optical module. Then, slowly insert the end of the optical module without the pull tab into the SFP+ port slot.

2. Remove the protective cap from the LC fiber connectors.

3. Identify the Rx and Tx ports on the optical module. Insert the two LC connectors from one end of the hybrid cable into the Rx and Tx ports respectively.

Connecting fibers

Connect the RJ-45 power connector at one end of the hybrid copper-fiber cable to the PoE++ interface of the device.

The positive and negative connections of the RJ-45 power connector of the hybrid copper-fiber cable must be correct, or else it may not supply power properly.

Connecting the RJ-45 power connector

1. Connect the RJ-45 power connector at the other end of the hybrid copper-fiber cable to any RJ-45 power connector on the FSW5100 faceplate (interface number 3-10), and connect the LC fiber connector to the optical transceiver module in any SFP+ interface (interface number 3-10).

Figure5-1 Connecting a hybrid copper-fiber cable

NOTE:

· To ensure that radio frequency sleep and other functions can be used and maintenance is convenient, please insert the RJ-45 power connector and LC fiber connector of the hybrid copper-fiber cable into the same-numbered copper ports and optical ports of the FSW5100. For example, insert the RJ-45 power connector into copper port 3 of the FSW5100, and insert the LC fiber connector into the optical transceiver module in the optical port 3 of the FSW5100.

· When the fiber link is not connected, it may be due to the incorrect connection of the fiber's sender and receiver. Please try swapping the Rx and Tx ends of the fiber first.

2. After the device is powered on, please check if the device's indicators are displayed normally. For a detailed description of the device indicator status, please refer to the hardware description of the product.

Connecting Ethernet twisted pair

NOTE:

The PoE++ interface and PoE+/GE interface cables both use RJ-45 type connectors, and the connection method is the same.

For an introduction to PoE++ interfaces and PoE+/GE interfaces, see the hardware description of the product.

Align the twisted pair with the PoE++ interface or PoE+/GE interface on the device, as shown in Figure5-2, and insert the twisted pair into the interface.

Figure5-2 Connecting twisted pair

Connecting power

Introduction to power supply modes

pRRU, as a powered device (PD), supports PoE power supply. Currently, it supports the following two PoE power supply methods:

· Powering PoE through FSW

· Power the PoE through a power injector

Under different power supply modes, based on different cables and cable connectors, you can select different PoE power supply configurations. The PoE power supply configurations supported by pRRU are shown in the table below.

Table5-1 Power supply configuration description

Power sourcing equipment	Power configuration	Explanation
FSW	RJ-45 power connector + hybrid copper-fiber cable	Recommended solution using FSW for power supply

	RJ-45 Crystal Head + Straight Network Cable	When there is no optical-electrical hybrid cable or it is difficult to deploy optical-electrical hybrid cable, you can select this solution

Power Injector

RJ-45 Crystal Head + Crossover Cable

Recommended solution powered by a power injector

When powered by FSW, if using the "RJ-45 type power connector + hybrid copper-fiber cable" configuration, please see "Connecting hybrid copper-fiber cables

." For detailed information about the cables, connectors, and power injectors mentioned in the power supply configuration, please refer to the hardware description of the product.

This section only introduces how devices connect to power injectors.

Connecting the power injector

IMPORTANT:

· It is strictly forbidden to use the RJ-45 power connector and power injector together.

· Please make sure the device is installed and checked before powering on.

· The power injector should be securely fixed, have good ventilation, be able to dissipate heat, and should not be placed hanging or directly stacked on other devices.

· When multiple power injectors are installed in the same equipment room or weak electric well, for the convenience of centralized management, the power cord (PWR) should be drawn from the spare air switch of the AC power distribution box to supply power to the power injectors centrally.

As shown in Figure5-3, the connection steps for powering the device using a power injector are as follows:

1. Connect one end of the Ethernet cable to the device's PoE++ interface.

2. Connect the other end of the Ethernet cable to the PoE1 or PoE2 interface of the power injector.

3. Connect the "power input line" end of the power injector to the AC power source.

Figure5-3 Connect power injector

NOTE:

For the power injector model, please see the hardware description of the corresponding product.

6 Verifying the installation

Wall-mounting check items

Table6-1 Wall-mounting check items

Number	Check item
1	Check if the equipment is installed in the same position as the design drawings
2	Check if the wall is sturdy
3	Check if the screws are tightened, and if the limit screws are in place
4	Check for any improper or dangerous installation practices, such as directly tying the equipment or installation components with plastic zip ties, immediate corrective action is required if found
5	Check if the environment where the equipment is located is clean, dust, garbage, etc. should be cleaned up promptly if present
6	Check if there is enough space around the equipment

Ceiling installation check items

Table6-2 Ceiling installation check items

Number	Check item
1	Check if the position of the equipment ceiling is consistent with the design drawings
2	Check if the cement ceiling is secure
3	Check if the screws are tightened, and if the limit screws are in place
4	Check for any other improper or even dangerous installation behaviors, such as directly tying the equipment or installation parts with plastic ties, if found, immediate rectification is required
5	Check if the environment where the equipment is located is clean, if there is dust, garbage, etc., it needs to be cleaned up promptly
6	Check if there is enough space around the equipment

Main structural beam installation inspection items

Table6-3 Main structural beam installation inspection checklist

Serial Number	Check item
1	Check if the position of the equipment's main frame matches the design drawings
2	Inspect if the main frame is a standard one and if it is firmly installed
3	Check if the screws are tightened and if the limit screws are properly in place
4	Inspect for any other improper or dangerous installation practices, such as directly tying equipment or components with plastic zip ties, which need immediate rectification if found
5	Check if the environment where the equipment is located is clean, and promptly clean up any dust or trash
6	Check if there is enough space around the equipment

Round rod installation check items

Table6-4 Round rod installation check items

Number	Check item
1	Check whether the position of the equipment's round bar is consistent with the design drawings
2	Check if the round bar is secure
3	Check if the screws are tightened, and if the limit screws are in place
4	Check for any other improper or even dangerous installation behaviors, such as using plastic zip ties to directly tie the equipment or installation components, if any are found, immediate rectification is required
5	Check if the environment where the equipment is located is clean, if there is dust, trash, etc., it needs to be cleaned up promptly
6	Check if there is enough space around the equipment

Hanger installation check Items

Table6-5 Hanger installation check items

Number	Check item
1	Check whether the installation of the equipment to the hanger is consistent with the design drawings
2	Check if the hanger is secure
3	Check if the bolts are tightened, and if the limit screws are in place
4	Check for any other improper or even dangerous installation practices, such as using plastic zip ties to directly tie the equipment or installation components, if any, need to be rectified immediately
5	Check if the environment where the equipment is located is clean, if there is dust, trash, etc., it needs to be cleaned up promptly
6	Check if there is enough space around the equipment

Cable connection checklist

Table6-6 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. When using the optical transceiver module with product code SFP-XG-CPRI-IR-SM1310, please ensure that the optical link attenuation between FSW and pRRU is 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.

When using the optical transceiver module with product code SFP-XG-CPRI-IR-SM1310, please ensure that the optical link attenuation between FSW and pRRU is less than 6.2dB.

7 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 packaging boxes and bags of pluggable modules for future use.

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 Figure7-1, 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.

Figure7-1 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 removable modules."

Replacing a hybrid copper-fiber cable

1. Unplug the RJ-45 power connector of the hybrid copper-fiber cable from the PoE++ interface of the pRRU at the pRRU end, and unplug the LC fiber connector from the optical transceiver module of the SFP+ interface.

Figure7-2 Remove the power connector and LC fiber optic

2. Remove the RJ-45 power connector of the hybrid copper-fiber cable from the RJ-45 power supply interface of the FSW, and unplug the LC fiber connector from the optical transceiver module of the SFP+ interface.

3. Install the new hybrid copper-fiber cable, for details, s ee "Connecting hybrid copper-fiber cables."

H3C pRRU5214 Pico Remote Radio Unit Installation Guide-6W100

1 Preparing for installation

Safety recommendations

Working at heights

Pre-installation check

Installing the device to a hanger

5 Connecting cables

Connecting hybrid copper-fiber cables

7 Maintaining the device

Replacing a transceiver module

Replacing a hybrid copper-fiber cable

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