Table of Contents

Chapter 4 Hardware Installation. 4-1

4.1 Confirming the Installation Preparations. 4-1

4.2 Installation Flowchart 4-1

4.3 Mounting the Switch to the Designated Position. 4-2

4.3.1 Mounting the Switch onto a 19” Standard Rack. 4-2

4.3.2 Mounting the Switch on the Tabletop. 4-3

4.4 Installing Modules of the Switch. 4-3

4.5 Connecting the Grounding Cable and Power Cables. 4-3

4.5.1 Connecting the Grounding Cable. 4-3

4.5.2 Connecting the AC Power Cable. 4-5

4.5.3 Connecting the DC Power Cable. 4-6

4.5.4 Connecting the PoE Power Cable. 4-8

4.6 Connecting Interface Cables. 4-9

4.6.1 Connecting the Console Cable. 4-9

4.6.2 Connecting the COM Port Cables. 4-10

4.6.3 Connecting Category-5 Cables. 4-11

4.6.4 Connecting Fibers. 4-12

4.7 Cabling. 4-14

4.7.1 Table-Mounted Switch. 4-14

4.7.2 Rack-Mounted Switch. 4-14

4.8 Cable Binding. 4-14

4.8.1 Use of Labels. 4-14

4.8.2 Precautions for Cable Binding. 4-14

4.9 Checking the Installation. 4-18

 

Chapter 4  Hardware Installation

The S7502 is designed for indoor application and must be fixed when applied.

4.1  Confirming the Installation Preparations

l           Make sure that you have read Chapter 3 carefully.

l           All requirements introduced in Chapter 3 have been met.

4.2  Installation Flowchart

Figure 4-1 Installation flowchart of the switch

 

 

4.3  Mounting the Switch to the Designated Position

4.3.1  Mounting the Switch onto a 19” Standard Rack

The S7502 has an integrated chassis and should operate indoors.

Figure 4-2 Mount an S7502 Ethernet switch onto a 19” standard rack

Take the following installation steps.

Step 1: Confirm the following before installation:

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

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

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

Step 3: With two people lifting the switch at both sides slowly, move the switch to a place in front of the rack.

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: Fasten the angle sets on the 19-inch columns to seat the switch in the chassis.

4.3.2  Mounting the Switch on the Tabletop

Step 1: Confirm the following before installation:

l           The table is firm enough to hold the switch and cables.

l           No obstacles around the table that may interfere with the installation.

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

Step 2: With two people lifting the switch at both sides slowly, position the switch to a place in front of the table.

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

4.4  Installing Modules of the Switch

Common modules of the switch include the cards, power module, and fan frame. For detailed installation procedures, see Chapter 6 “Hardware Maintenance”.

4.5  Connecting the Grounding Cable and Power Cables

4.5.1  Connecting the Grounding Cable

 

 

 

I. Common grounding environment

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

Step 2: Set the grounding cable connector shipped with the switch around the grounding screw.

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

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

 

 

II. Other grounding environment

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 grounding cable to the grounding screw of the grounding strip and fasten the captive nuts. The grounding cable of a switch shall be connected to the project ground of the equipment room.

 

 

Figure 4-3 Connect the grounding cable to the grounding strip

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 grounding cable should be welded with the angle iron (steel pipe) and the joint should be processed against eroding.

Figure 4-4 Connect the grounding cable to the grounding body nearby

l           If there is no grounding strip and no grounding body can be buried, and the Ethernet switch is AC powered, you can 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 Connect the grounding cable through AC PE wire

4.5.2  Connecting the AC Power Cable

 

 

(1) AC input socket	(2) Power LED
(3) Handle of power module	(4) Power switch
(5) Bail latch

Figure 4-6 S7502 power module

The power module has AC input socket with bail latch and a power LED on its front panel (The LED is described in 6.1.2).

Step 1: Pull up the bail latch to the right. The bail latch is on the left side of the panel.

Step 2: Insert the AC power cable which is shipped with the switch into the AC input socket of the power supply module.

Step 3: Push back the bail latch to keep the power cable from being removed.

Step 4: Insert the other end of the power cable into the site power socket.

4.5.3  Connecting the DC Power Cable

 

 

(1) Power switch	(2) Power LED
(3) Handle of power module	(4) DC power socket
RTN: -48 V working ground	-48V: -48 V DC power
PGND: protection ground (You do not need to connect it because it is connected to the chassis from inside the power module).

Figure 4-7 S7502 DC power module

Follow these steps to connect the DC power cable:

Step 1: Install the DC power plug components.

Figure 4-8 DC power plug

As shown in Figure 4-8, first insert two cables into the appropriate holes through dust-proof shield, and then fix the cables separately by using screws 1 and 2. Make sure that the positive and negative ends of the cable are inserted appropriately in accordance with the silkscreen print on the holes.

Fix the dust-proof shield by screws 3 and 4 by using a small flathead screwdriver, see Figure 4-8.

Enlace the two cables to the polarizing key at the back of the dust-proof shield using the cable tie, as shown in Figure 4-8.

Step 2: After installing connector component, directly insert the component into DC socket on the cabinet (Note that the component cannot be inserted in the wrong direction), and then fix the screws 1 and 2 carried by the connector itself to the appropriate holes on the cabinet socket using a small flathead screwdriver.

Step 3: Check whether the power LED is ON. If the LED is ON, it indicates the power cable is properly connected.

4.5.4  Connecting the PoE Power Cable

(a) AC power input socket	(b) DC power output
(c) RS232 and RS485 interfaces	(d) Chassis grounding point

Figure 4-9 Appearance of the PSE

 

 

(1) Grounding screw	(2) RTN(+) terminal of of PoE power supply input
(3) NEG(-) terminal of PoE power supply input

Figure 4-10 Rear view of an S7502 PoE chassis

Follow these steps to connect the PoE power cable:

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

Step 2: Insert the -48V OT terminal of the DC power cable 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.

Figure 4-11 Rear panel of external PoE power supply (PSE2500-A3)

Step 3: Insert the GND OT terminal of the DC power cable to the RTN(+) terminal of the switch and fasten the mounting screw; insert the other end to the RTN(+) terminal on the rear panel of the external PoE power supply.

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

4.6  Connecting Interface Cables

4.6.1  Connecting the 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 (male) connector and can be inserted to the 9-core (female) socket. The following figure illustrates the Console cable.

Figure 4-12 A Console cable

Table 4-1 Console cable pinout

RJ45	Signal	DB-9	Signal
1	RTS	8	CTS
2	DTR	6	DSR
3	TXD	2	RXD
4	SG	5	SG
5	SG	5	SG
6	RXD	3	TXD
7	DSR	4	DTR
8	CTS	7	RTS

 

II. Connect a Console cable

Take the following steps to connect the Console cable when configuring the switch via a terminal.

Step 1: Plug the DB-9 female plug of the Console cable to the serial port of a PC or a 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.

 

 

4.6.2  Connecting the 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 female connector and can be inserted to 9-pin male connector. The COM port cable is the same as the Console cable.

For detailed description, see Figure 4-12 and Table 4-1.

II. Connect COM Port Cable

When connected to 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 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.

4.6.3  Connecting Category-5 Cables

I. Introduction

The 10Base-T/100Base-TX and 1000Base-T ports of an S7502 switch match RJ-45 connectors, and are MDI/MDIX auto-sensing. You can use category-5 cables to connect it. The following figure illustrates the appearance and pinouts of an RJ-45 connector.

Figure 4-13 An RJ-45 connector

Table 4-2 RJ-45 MDI port pinout

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

 

 

Table 4-3 RJ-45 MDI-X port pinout

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

 

II. Connect a Category-5 cable

Step 1: Plug one end of the category-5 cable into an Ethernet RJ-45 jack of the switch to be connected.

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

4.6.4  Connecting Fibers

I. Introduction

Before connecting the fibers, make sure the type of the connector and the fiber match that of the optical port.

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 reduces the actual ports that are in use of a connector.

Figure 4-14 An MT-RJ connector

l           SC fiber connector

Figure 4-15 An SC connector

l           LC fiber connector

Figure 4-16 An LC connector

II. Connect an optical fiber

Step 1: Remove the protective cap from the connector and clean the fiber end.

Step 2: Remove the optical port cover of the switch. Insert one end of the fiber into the optical port of the switch.

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

 

 

4.7  Cabling

4.7.1  Table-Mounted Switch

If the chassis of a switch stands alone, you do not have to care about the inside or outside cabinet cabling. All the port service cables can run along the left side of the chassis (cabling channel), and the chassis power cables can run upward or downward based on the specific conditions in the equipment room (lightning protection box, terminal bar etc).

4.7.2  Rack-Mounted Switch

For the switches are mounted in a 19-inch standard rack, the service cables can be bound to the cable binding rack at the left side of the chassis and be 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 cables run out of the rear left of the chassis and either on the cable rack or in the raised floor as near as possible based on the specific conditions in the equipment room (lightning protection box, terminal bar etc). 

4.8  Cable Binding

4.8.1  Use of Labels

Correctly edit the label and paste it to a proper place on the bound cables.

4.8.2  Precautions for Cable Binding

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

Figure 4-17 Cable binding example I

l           The radius of the curve at which a cable is bent should be no less than twice of the cable’s diameter. At the point where a cable runs out of a connector, the radius of the curve at which the cable is bent should be no less than five times of its diameter.

l           Cables of different type (that is, power cable, signal cable, grounding cable, etc.) 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 cable and signal cable should be no less than 30mm;

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 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. The following types of ties are provided: 100*2.5mm, 150*3.6mm, 300*3.6mm, 530*9mm, and 580*13mm;

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

Figure 4-18 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 4-19 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 cable and -48V power cable cannot be tied on the guides of any mobile components;

l           Keep excessive parts of power cables for those mobile components, such as grounding cable 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 4-20 Cable fixing example

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

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

l           The power cables 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 4-4 Tie-binding parameters

Cable bundle diameter (mm)	Space between bundles (mm)
10	80~150
10~30	150~200
30	200~300

 

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.

4.9  Checking the Installation

 

 

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

Table 4-5 Installation checklist

Items	Normal	Abnormal (Description)
ESD wrist strap
Console cable
Grounding cable
Power cable
SRPU
LPU
Fan tray