The connection of S6502 power cable is different from that of the power cables of other S6500 series switches. For details, see the following sections.

Figure 4-1 Installation flow of the switch

4.3 Mounting the Switch in 19-Inch Standard Rack

S7500 Series Switches have integrated chassis and can be used indoors.

Take the following installation steps.

Step 1: Confirm before installation

l Ensure the rack has been well fixed. The installation position for the switch has been well arranged and there is no obstacle around.

l Ensure the switch is ready for installation and has been carried to a place near to the rack and convenient for moving.

Step 2: Install the wiring channel and mounting angle sets shipped with the switch.

Step 3: Two people carry the switch at both sides to the place in front of the rack slowly.

Step 4: Carry the switch a little higher than the rack tray or guides. Put the switch on the tray or the guides and push it into the rack.

Step 5: Attach the chassis mounting angle sets to the square holes in the posts of the 19-inch rack with screws to fix the switch on the rack.

4.4 Mounting the Switch in B68 Cabinet

When purchasing S7500 series switches, you can also select a B68 cabinet as required. The installation position of the S7500 series switch has been determined on the B68 cabinet based on the contract. Besides, all the accessories outside the switch except the LPUs and LPU cables are installed. Table 4-1 lists the B68 series cabinets.

Table 4-1 B68 cabinet model and installation remarks

Model		Remarks
B68	B68-22	For detailed installation procedures, see Appendix A
B68	B68-18	For detailed installation procedures, see Appendix A

& Note:

Two types of B68 cabinets are available. One is 1.8-meter-tall B68-18 cabinet, which accommodates a height of 37 U; and the other is 2.2-meter-tall B68-22 cabinet, which accommodates a height of 46 U. The installation requirements for both types of cabinets are the same, such as space planning, positioning and fixing cabinets.

4.4.1 Mounting a Switch

You are recommended to mount no more than one S7500 Series Switch in a B68-22 cabinet.

Step 1: Confirm before installation

l Ensure the cabinet has been well fixed. The installation position for the switch has been well arranged and there is no obstacle around.

l Ensure the switch is ready for installation and has been carried to a place near to the cabinet and convenient for moving.

Step 2: Mount a barrier to hold the switch in B68-22 cabinet.

Step 3: Install the wiring channel and mounting angle sets shipped with the switch.

Step 4: Two people carry the switch at both sides to the place in front of the cabinet slowly.

Step 5: Lift the switch a little higher than the barrier and put it on the barrier and adjust its location.

Step 6: Attach the chassis mounting angle sets to the square holes in the posts of the B68-22 cabinet with screws to fix the switch on the cabinet.

Figure 4-2 Mount a switch (S7506 for example) in a B68-22 cabinet

4.5 Mounting the Switch on the Workbench

Step 1: Confirm before installation

l Make sure the workbench is firm enough to hold the switch and cables.

l No installing obstacles around the workbench.

l Ensure the switch is ready for installation and has been carried to a place near to the cabinet and convenient for moving.

Step 2: Two people carry the switch at both sides to the place in front of the workbench slowly.

Step 3: Carry the switch a little higher than the workbench and put the switch on it.

4.6 Connect Ground Wire and Power Cord

4.6.1 Connecting Ground Wire

Caution:

For the safety of personnel and equipment, the switch shall be well grounded. The resistance between switch chassis and the ground should be less than 1 ohm.

& Note:

The grounding screw is located on the power distribution box sit on the back floor of the chassis.

I. Common grounding environment

Step 1: Remove the screw from the grounding hole in the switch chassis.

Step 2: Set the ground wire connector provided together with the switch around the grounding screw.

Step 3: Fasten the grounding screw in the hole on the chassis.

Step 4: Connect the other end of the ground wire to the grounding strip of the switch.

& Note:

Generally, the cabinet has a grounding strip. The ground wire of the switch can be connected to the grounding strip of the cabinet.

II. Other grounding environment

& Note:

The following figures are sketch maps, and just show the way of cord connecting rather than the real layouts.

Hereafter introduced some methods for grounding the switch in different environment.

l If there is a grounding strip in the Ethernet switch installation environment, attach one end of the yellow-green protection ground wire to the grounding screw of the grounding strip and fasten the captive nuts. The ground wire of a switch shall be connected to the project ground of the equipment room.

Figure 4-3 Sketch of grounding with grounding strip available

l If there is no grounding strip but earth nearby and the grounding body is allowed to be buried, you can simply hammer an angle iron or steel pipe no shorter than 0.5m into the earth. In this case, the yellow-green protection ground wire should be welded with the angle iron (steel pipe) and the joint should be processed against eroding.

Figure 4-4 Sketch of grounding when it is allowed to bury grounding body nearby in an equipment room

l If there is no grounding strip and no grounding body can be buried, the Ethernet switch with AC power supply can be grounded through the PE wire of the AC power supply. In this case, make sure that the PE wire of the AC power supply has been well grounded at the power distribution room or AC power supply transformer side.

Figure 4-5 Sketch of grounding through AC PE wire

l If there is no grounding strip and no grounding body can be buried, the Ethernet switch powered by -48V DC can be grounded through the RTN wire of the DC power supply. In this case, make sure RTN wire has been well grounded from the DC egress of the DC power cabinet.

Figure 4-6 Sketch of grounding through PGND of a power cabinet

4.6.2 Connecting AC Power Cord

Caution:

For lightning protection, the AC power should be led through the external lightning device into S7500 Series Ethernet Switches.

Step 1: Plug the AC power cord into the socket in the switch and hook the cord plug to avoid falling.

Step 2: Plug the other end into the socket strip (with lightning protection). Connect the strip to the AC power source in the room.

(1) Mousing- hook

(2) Power socket

(3) Grounding screw

Figure 4-7 (S7506 Switch) Power cord connection

4.6.3 Connecting DC Power Cord

Caution:

Power OFF all the related parts of the switch before connecting DC power cord.

Step 1: Loosen the mounting screw and remove the cover of the terminal posts on the DC power distributing box.

Step 2: Loosen the mounting nut of the connection terminal, using socket wrench.

Step 3: Connect the -48V terminal (with a blue wire) of the DC power cord of the switch to the terminal marked with -48V and fasten the mounting nut.

Step 4: Connect the GND terminal (with a black wire) of the DC power cord of the switch to the terminal RTN and fasten the mounting nut with socket wrench.

Step 5: Cover the terminal posts and fasten the mounting screws.

Step 6: Connect the other end of the DC power cord to the connection terminal for power input to the switch.

Figure 4-8 DC power cord connection (for example, S7506 Switch)

4.6.4 Connecting PoE Power Cord

Follow these steps to connect the PoE power cord:

Step 1: Loosen the mounting screw of the PoE terminal block on the rear panel of the switch.

(1) PoE external power input: NEG(-)

(2) (+)PoE external power input: NEG(+)

(3) COM port (external power monitor)

Figure 4-9 Rear panel of S7506 XGbus

Step 2: Insert the -48V OT terminal of the DC power cord to the NEG (-) terminal of the switch and fasten the mounting screw; insert the other end to the NEG (-) terminal of the external PoE power supply.

(1) AC input socket	(2) DC output terminal: NEG(-)
(3) DC output terminal: RTN(+)	(4) RS232 serial port

Figure 4-10 Front panel of external PoE power supply (PSE2500-A1)

Step 3: Insert the GND OT terminal of the DC power cord to the RTN (+) terminal of the switch and fasten the mounting screw; insert the other end to the NEG (-) terminal of the site power.

Step 4: Insert the PGND OT terminal of the DC power cord to the grounding screw of the switch and fasten the mounting screw; insert the other end to the grounding bar for the switch.

& Note:

For the detailed installing of PSE2500-A1 external PoE power system, see the manual shipped with PSE2500-A1.

4.7 Installing Cabling Rack

For your convenience, cabling racks are shipped together with S7500 Series Switches. Take the following steps to install the rack.

Step 1: Face the I/O card slot of the switch;

Step 2: Attach the provided fixing brace to the left (opposite side toward the fan frame) of the switch;

Step 3: Insert the provided wiring channel into the brace and fasten the screws.

Figure 4-11 (S7506 Switch) Wire channel location

4.8 Installing Card of a Switch

S7500 Series Ethernet Switch cards, including LPU and SRPU, are hot-swappable.

Step 1: Wear an ESD wrist strip which is well grounded and take a card out of the packet.

Step 2: Using a Phillips screwdriver to remove the blank filler panel from the chassis slot where you plan to install the card.

Step 3: Hold the ejector levers of the card with both hands and push them outward, align the card with the guides in the chassis and slide it gently into the slot. Push the card until positioning pin on its handle bar touches the hole in the chassis.

Step 4: Press the ejector levers inward and seat the pin on the handle bar into the positioning hole in the chassis.

Step 5: Fasten the captive screws to fix the card, using the Phillips screwdriver.

& Note:

Save the removed blank panel for future use.

4.9 Interface Cabling

4.9.1 Connecting Console Cable

I. Introduction

Console cable is an 8-core shielded cable. One end of the cable is a crimped RJ-45 connector, which is to be plugged into the console port of the switch. The other end is furnished with a DB-9-hole connector. You can select either of them based on your actual requirements to fit in with the 9-pin serial interface at the configuration terminal. The following figure illustrates the console cable.

Figure 4-12 Console cable

Table 4-2 Console cable pinout

RJ-45	Signal	Direction	DB-25	DB-9
1	RTS	←	4	7
2	DTR	←	20	4
3	TXD	←	2	3
4	CD	→	8	1
5	GND	—	7	5
6	RXD	→	3	2
7	DSR	→	6	6
8	CTS	→	5	8

II. Connecting console cable

Take the following steps to connect the console cable, when configuring the switch on the terminal.

Step 1: Plug the DB-9 female plug of the console cable to the serial port of the PC or the terminal where the switch is to be configured.

Step 2: Connect the RJ-45 connector of the console cable to the console port of the switch.

4.9.2 Connecting AUX Cable

AUX cables are used for the S7500 Series Ethernet Switches remote dial-up configuration by Modem.

I. Introduction

AUX cable is an 8-core shielded cable. One end of the cable is an RJ-45 interface of RS-232, which can be plugged into the switch Console port. The other end is furnished at the same time with a DB-9-pin connector and a DB-25-pin connector of which users can choose one to plug into the DB-9-hole or DB-25-hole socket on the Modem according to the actual requirements. The following figure illustrates the AUX cable.

Figure 4-13 AUX cable

Table 4-3 AUX cable pinout

RJ-45	Signal	Direction	DB-25	DB-9
1	RTS	→	4	7
2	DTR	→	20	4
3	TXD	→	2	3
4	CD	←	8	1
5	GND	—	7	5
6	RXD	←	3	2
7	DSR	←	6	6
8	CTS	←	5	8

II. Connecting AUX Cable

Step 1: Plug the RJ-45 connector of the AUX cable into Console port of the switch.

Step 2: Plug the DB-25 (or DB-9) connector of the AUX cable into the serial port of the analog Modem.

4.9.3 Connecting COM Port Cables

I. Introduction

COM port cable is an 8-core shielded cable. One end of the cable is crimped with an RJ-45 connector, for connection with the COM port of the switch; the other end is attached with a DB-9 (male) connector and can be inserted to 9-core (female) socket. The following figure illustrates the COM port cable.

Figure 4-14 COM port cable

Table 4-4 AUX cable pinout

RJ-45	Signal	Direction	DB-9
1	RTS		7
2	DTR		4
3	TXD		3
4	CD		1
5	GND	—	5
6	RXD		2
7	DSR		6
8	CTS		8

II. Connecting COM Port Cable

When the S7506 XGbus switch connects with the external PoE power supply, the switch can monitor the running state of the external PoE power supply through the COM port. Take the following steps to connect the COM port cable:

Step 1: Insert the DB-9 female plug of the COM port cable to the RS232 serial port of the PoE power supply.

Step 2: Connect the RJ-45 connector of the COM port cable to the COM port of the switch.

4.9.4 Connecting Category-5 Cables

I. Introduction to RJ-45 Connector

10Base-T/100Base-TX and 1000Base-T ports of S7500 Series Ethernet Switches match RJ-45 connectors, support MDI/MDIX auto-sensing, and adopt category-5 cables. The following figure illustrates the appearance and pinouts of RJ-45 connector.

Figure 4-15 RJ-45 connector

Table 4-5 RJ-45 MDI interface pinout assignment

Pinout	10Base-T/100Base-TX		1000Base-T
Pinout	Signal	Function	Signal	Function
1	Tx+	Send data	BIDA+	Bi-directional data cable A+
2	Tx-	Send data	BIDA-	Bi-directional data cable A-
3	Rx+	Receive data	BIDB+	Bi-directional data cable B+
4	Reserved	—	BIDC+	Bi-directional data cable C+
5	Reserved	—	BIDC-	Bi-directional data cable C-
6	Rx-	Receive data	BIDB-	Bi-directional data cable B-
7	Reserved	—	BIDD+	Bi-directional data cable D+
8	Reserved	—	BIDD-	Bi-directional data cable D-

& Note:

Tx = Transmit data

Rx = Receive data

BI = Bi-directional data

Table 4-6 RJ-45 MDI-X interface pinout assignment

Pinout	10Base-T/100Base-TX		1000Base-T
Pinout	Signal	Function	Signal	Function
1	Rx+	Receive data	BIDB+	Bi-directional data cable B+
2	Rx-	Receive data	BIDB-	Bi-directional data cable B-
3	Tx+	Send data	BIDA+	Bi-directional data cable A+
4	Reserved	—	BIDD+	Bi-directional data cable D+
5	Reserved	—	BIDD-	Bi-directional data cable D-
6	Tx-	Send data	BIDA-	Bi-directional data cable A-
7	Reserved	—	BIDC+	Bi-directional data cable C+
8	Reserved	—	BIDC-	Bi-directional data cable C-

& Note:

Pins 1 and 2 (negative), 3 and 6 (positive) are used for external PoE power supply.

II. Connecting Category-5 Cables

Step 1: Plug one end of the network cable into the Ethernet RJ-45 jack of the switch to be connected.

Step 2: Plug the other end of the cable into the RJ-45 port of the peer device.

4.9.5 Connecting Fiber

I. Introduction to Fiber Connector

Before connecting the fibers, make sure the type of the connector and the fiber are consistent with that of the optical interface.

Fiber connectors are indispensable passive components in optical fiber communication system. Their application enables the removable connection between optical channel, which makes optical system debugging and maintenance more convenient and transit dispatching more flexible. Among multiple fiber connectors, only SC, LC, and MT-RJ will be introduced here.

l MT-RJ fiber connector: It integrates two channels of light sources into a single fiber, which actually reduces the ports of a connector.

Figure 4-16 MT-RJ connector

l SC fiber connector

Figure 4-17 SC connector

l LC fiber connector

Figure 4-18 LC connector

II. Connecting Fiber

Step 1: Remove the protective cap of the fiber and clean the

Step 2: Remove the protective cap from the optical interface of the switch, and plug one end of the fiber into this interface.

Step 3: Connect the other end of the fiber connector to the corresponding device.

Caution:

When the optical interface has not been connected with a fiber connector or its dustproof cover is open, there might be some invisible radiation emitted from the optical interface. So do not stare into the optical interface directly.

Cover the optical interface if there is no connector plugged in.

4.10 Recommendation on Installation Cabling

4.10.1 Bench-Mounted Switch

For only selling an integrated chassis, you do not have to care about the cabling inside or outside the cabinet. All the interface service cables run on the left side of the chassis (cabling channel), and the chassis power cords (including AC and DC power cords) run by the rear chassis panel.

4.10.2 Rack-Mounted Switch

For the switches mounted in a 19-inch standard rack or B68-22 cabinet, the service cables are bound on the cable binding rack at the left side of the chassis and arranged to run on the cable rack or in the raised floor according to the situation in an exchange equipment room (whether the signal cable of the room is accessed from the cable rack on the top of the chassis or the cable channel under the floor.) Collect all the transit data signal cable connectors and locate them on the floor of the chassis (instead of any places outside the chassis for fear of unexpected damage). The power cords run out of the rear left of the chassis and either on the cable rack or in the raised floor as near as possible according to the situation in an exchange equipment room (concerning DC power distribution cabinet, lightning protection box, terminal strip and so on).

4.11 Cable Binding for Installation

4.11.1 Correctly Use the Labels

Correctly edit the label and paste it to the right place of the bound cables. For details, refer to the description of label usage in the appendix.

4.11.2 Precautions for Binding Cables

l Bind the cables straight in the cabinet. No twisting or bending.

Figure 4-19 Cable binding example I

l The cable body cannot be bent beyond twice of its diameter. The cable running out of a connector cannot be bent beyond five times of its diameter.

l Different cables (power cord, signal cable, ground wire, and so on.) should run and be bound separately in a cabinet. They cannot be bound together. If they are close to each other, you can cable them in a crossing way. For parallel cabling, the space between power cord and signal cable should be no less than 30 mm;

l The cable binding rack and cable channel inside and outside a cabinet should be smooth and stretch no sharp points.

l The metal hole through which a cable runs through should have a smooth and fully surface or an insulating bush;

l Use the right type of ties to bind the cables. Do not bind any cables with tied ties. H3C technologies provides the following types of ties: 100 x 2.5 mm (3.9 x 0.01 in), 150 x 3.6 mm (5.9 x 0.1 in), 300 x 3.6 mm (11.8 x 0.1 in), 530 x 9 mm (20.9 x 0.4 in), and 580 x 13 mm (22.8 x 0.5 in);

l Bind the cables with ties and cut the extra parts. Trim the cut and leave no sharp points. See the following figure:

Figure 4-20 Cable binding example II

l Before bending the cables, bind them first. Mind that no tie binds the bended part of any cables, for fear of cable core breaking due to excessive stress. See the following figure.

Figure 4-21 Cable binding example III

l The spare cables or excessive parts should be folded and bound and located at right places in a cabinet or on the cable channel. In the so-called right places, the running device will not be affected or damaged and the cables will not be damaged, either.

l 220V power cord and -48V power cord cannot be tied on the guides of any mobile components;

l Keep excessive parts of power cords for those mobile components, such as ground wire of doors, to free the cables from possible stress. When installing these components, make sure the excessive cables will not touch heat source, sharp point, or keen edges. Use high temperature cables near the heat sources;

l For the cable terminals fixed with screw thread, the screws or nuts should be fastened and prevented from loosing. See the following figure;

Figure 4-22 Cable fixing example

l Fix the terminal of harder power cords to free the terminal and the cable from stress;

l No tapping screw can be used to fasten the cabling terminals;

l The power cords of the same type and in the same direction should be bound together and kept clean and straight;

Follow the parameters defined in the following table for binding cables with ties.

Table 4-7 Tie-binding parameters

Cable bundle diameter (mm, in)	Space between bundles (mm, in)
10, 0.4	80 to150, 3.1 to 5.9
10 to 30, 0.4 to 1.2	150 to 200, 5.9 to 7.9
30, 1.2	200 to 300, 7.9 to 11.8

l No cable or bundle can tie a knot;

l The metal parts of crimping cold-pressed terminal blocks (such as air switch) cannot stretch beyond the blocks.

4.12 Check after Installation

Caution:

Confirm that you have turned off the power before checking, otherwise, improper connection will hurt people or the component of the switch.

After installing the switch, please check if the items listed in the following table are normal.

Table 4-8 Installation checking list

Items	Normal	Abnormal (Description)
ESD wrist strap	—	—
Console cable	—	—
Ground wire	—	—
Power cord	—	—
SRPU	—	—
LPU	—	—
Fan Frame	—	—

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