Connecting I/O Module Interface Cables; Connecting Electrical Port Cables - 3Com Switch 7700 Installation Manual

5.7. Connecting I/O Module Interface Cables

This section describes how to connect electrical and optical cables.

5.7.1. Connecting Electrical Port Cables

The 48TX port uses the RJ-45 connector and category-5 twisted pair cable as transmission medium. The 8BT port
uses the RJ-45 connector, shown in Figure 18.
Use the following steps to connect the 48TX port:
1. Plug one end of the straight-through cable into the Ethernet RJ-45 port of the switch.
2. Plug the other end of the straight-through cable into the RJ-45 port of the hub or LAN Switch.
Figure 18 The RJ-45 connector
PIN #8
PIN #1
Note:
Ports on 48TX and 8BT modules support MDI/MDI-X auto-sensing.
Table 27 RJ-45 MDI port pin-outs
Pinout
1
2
3
4
5
6
7
8
Note:
Tx = Send data Rx = Receive data BI = Bi-directional data.
Table 28 RJ-45 MDI-X port pin-outs
Pinout
1
2
3
4
5
6
7
8
10Base-T/100Base-TX
Signal Function
Tx+ Send data
Tx- Send data
Rx+ Receive data
Reserved -
Reserved -
Rx- Receive data
Reserved -
Reserved -
10Base-T/100Base-TX
Signal Function
Rx+ Receive data
Rx- Receive data
Tx+ Send data
Reserved -
Reserved -
Tx- Send data
Reserved -
Reserved -
I N S T A L L I N G
1000Base-T
Signal Function
BIDA+ Send data to direction A
BIDA- Receive data from direction A
BIDB+ Send data to direction B
BIDC+ Receive data from direction C
BIDC- Send data to direction C
BIDB- Receive data from direction B
BIDD+ Send data to direction D
BIDD- Receive data from direction D
1000Base-T
Signal Function
BIDB+ Send data to direction B
BIDB- Receive data from direction B
BIDA+ Send data to direction A
BIDD+ Receive data from direction D
BIDD- Send data to direction D
BIDA- Receive data from direction A
BIDC+ Send data to direction C
BIDC- Receive data from direction C
H A R D W A R E
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