1000BASE-T Pin Assignments

All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use straight-through cables for all network connections to PCs or servers, or to other switches or hubs.

The table below shows the 1000BASE-T MDI and MDI-X port pinouts. These ports require that all four pairs of wires be connected. Note that for 1000BASE-T operation, all four pairs of wires are used for both transmit and receive. Use 100-ohm Category 5, 5e or 6 unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for 1000BASE-T connections. Also be sure that the length of any twisted-pair connection does not exceed 100 meters (328 feet).

Table B-2. 1000BASE-T MDI and MDI-X Port Pinouts

Pin

MDI Signal Name

MDI-X Signal Name

1

Bi-directional Data One Plus

Bi-directional Data Two Plus

 

(BI_D1+)

(BI_D2+)

2

Bi-directional Data One Minus

Bi-directional Data Two Minus

 

(BI_D1-)

(BI_D2-)

3

Bi-directional Data Two Plus

Bi-directional Data One Plus

 

(BI_D2+)

(BI_D1+)

4

Bi-directional Data Three Plus

Bi-directional Data Four Plus

 

(BI_D3+)

(BI_D4+)

5

Bi-directional Data Three Minus

Bi-directional Data Four Minus

 

(BI_D3-)

(BI_D4-)

6

Bi-directional Data Two Minus

Bi-directional Data One Minus

 

(BI_D2-)

(BI_D1-)

7

Bi-directional Data One Plus

Bi-directional Data One Plus

 

(BI_D4+)

(BI_D3+)

8

Bi-directional Data Four Minus

Bi-directional Data Three Minus

 

(BI_D4-)

(BI_D3-)

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MRV Communications MR2228-S2C manual 1000BASE-T Pin Assignments