3com S7906E Guide D’Installation Rapide
3-14
10Base-T/100Base-TX
1000Base-T
Pin
Signal
Function
Signal
Function
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-
Tx = Transmit data
Rx = Receive data
BI = Bi-directional data
Table 3-3 RJ-45 MDI-X interface pinouts
10Base-T/100Base-TX
1000Base-T
Pin
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-
Pins 1 and 2 (negative), 3 and 6 (positive) are used for external PoE power supply.
Connection procedure
1) Plug one end of the network cable into the Ethernet RJ-45 jack of the switch to be connected.
2) Plug the other end of the cable into the RJ-45 port of the peer device.