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Cables
B-4
B
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-X and MDI 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-X and MDI Port Pinouts
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. 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.”
Note that when testing your cable installation, be sure to include all patch cables
between switches and end devices.
1000BASE-T MDI-X and MDI Port Pinouts
Pin MDI-X Signal Name MDI Signal Name
1 Bi-directional Data Two Plus (BI_D2+) Bi-directional Data One Plus (BI_D1+)
2 Bi-directional Data Two Minus (BI_D2-) Bi-directional Data One Minus (BI_D1-)
3 Bi-directional Data One Plus (BI_D1+) Bi-directional Data Two Plus (BI_D2+)
4 Bi-directional Data Four Plus (BI_D4+) Bi-directional Data Three Plus (BI_D3+)
5 Bi-directional Data Four Minus (BI_D4-) Bi-directional Data Three Minus (BI_D3-)
6 Bi-directional Data One Minus (BI_D1-) Bi-directional Data Two Minus (BI_D2-)
7 Bi-directional Data Three Plus (BI_D3+) Bi-directional Data Four Plus (BI_D4+)
8 Bi-directional Data Three Minus (BI_D3-) Bi-directional Data Four Minus (BI_D4-)