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B-5
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).
Cable Testing for Existing Category 5 Cable
Installed Category 5 cabling must pass tests for Attenuation, Near-End
Crosstalk (NEXT), and Far-End Crosstalk (FEXT). This cable testing
information is specified in the ANSI/TIA/EIA-TSB-67 standard.
Additionally, cables must also pass test parameters for Return Loss and
Equal-Level Far-End Crosstalk (ELFEXT). These tests are specified in the
ANSI/TIA/EIA-TSB-95 Bulletin, “The Additional Transmission
Performance Guidelines for 100 Ohm 4-Pair Category 5 Cabling.”
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_D1+) Bi-directional Data Two Plus (BI_D2+)
2
Bi-directional Data One Minus (BI_D1-) Bi-directional Data Two Minus (BI_D2-)
3
Bi-directional Data Two Plus (BI_D2+) Bi-directional Data One Plus (BI_D1+)
4
Bi-directional Data Three Plus (BI_D3+) Bi-directional Data Four Plus (BI_D4+)
5
Bi-directional Data Three Minus (BI_D3-) Bi-directional Data Four Minus (BI_D4-)
6
Bi-directional Data Two Minus (BI_D2-) Bi-directional Data One Minus (BI_D1-)
7
Bi-directional Data Four Plus (BI_D4+) Bi-directional Data Three Plus (BI_D3+)
8
Bi-directional Data Four Minus (BI_D4-) Bi-directional Data Three Minus (BI_D3-)