H3C Technologies H3C SR6600 User Manual

Page 75

Table 29 RJ-45 MDI port pinouts

10Base-T/100Base-TX 1000Base-T

Signal Function

1 Tx+

Sends

data

BIDA+

Bi-directional data
cable A+

2 Tx- Sends

data

BIDA-

Bi-directional data
cable A-

3 Rx+

Receives

data

BIDB+

Bi-directional data
cable B+

4 Reserved

N/A

BIDC+

Bi-directional data
cable C+

5 Reserved

N/A

BIDC-

Bi-directional data
cable C-

6 Rx- Receives

data

BIDB-

Bi-directional data

cable B-

7 Reserved

N/A

BIDD+

Bi-directional data
cable D+

8 Reserved

N/A

BIDD-

Bi-directional data
cable D-

Table 30 RJ-45 MDIX port pinouts

10Base-T/100Base-TX 1000Base-T

Signal Function

1 Rx+

Receives

data

BIDB+

Bi-directional data
cable B+

2 Rx- Receives

data

BIDB-

Bi-directional data

cable B-

3 Tx+

Sends

data

BIDA+

Bi-directional data
cable A+

4 Reserved

N/A

BIDD+

Bi-directional data
cable D+

5 Reserved

N/A

BIDD-

Bi-directional data
cable D-

6 Tx- Sends

data

BIDA-

Bi-directional data
cable A-

7 Reserved

N/A

BIDC+

Bi-directional data
cable C+

8 Reserved

N/A

BIDC-

Bi-directional data
cable C-

To ensure normal communication, the pins for sending data on one port must correspond to the pins for

receiving data on the peer port. When both of the ports on the two devices are MDI or MDIX, use a

crossover Ethernet cable; when one port is MDI and the other is MDIX, use a straight-through Ethernet

cable. To summarize, straight-through and crossover cables connect the following devices: