Table of Contents
Advertisement
C
ABLES
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-X and MDI Port Pinouts
Pin
MDI-X Signal Name
1
Bi-directional Data Two Plus (BI_D2+)
2
Bi-directional Data Two Minus (BI_D2-)
3
Bi-directional Data One Plus (BI_D1+)
4
Bi-directional Data Four Plus (BI_D4+)
5
Bi-directional Data Four Minus (BI_D4-)
6
Bi-directional Data One Minus (BI_D1-)
7
Bi-directional Data Three Plus (BI_D3+)
8
Bi-directional Data Three Minus (BI_D3-)
1000BASE-T Cable Requirements
All Category 5 UTP cables that are used for 100BASE-TX connections
should also work for 1000BASE-T, providing that all four wire pairs are
connected. However, it is recommended that for all critical connections, or
any new cable installations, Category 5e (enhanced Category 5) or 6 cable
should be used. The Category 5e and 6 specifications include test
parameters that are only recommendations for Category 5. Therefore, the
first step in preparing existing Category 5 cabling for running
B-4
MDI Signal Name
Bi-directional Data One Plus (BI_D1+)
Bi-directional Data One Minus (BI_D1-)
Bi-directional Data Two Plus (BI_D2+)
Bi-directional Data Three Plus (BI_D3+)
Bi-directional Data Three Minus (BI_D3-)
Bi-directional Data Two Minus (BI_D2-)
Bi-directional Data Four Plus (BI_D4+)
Bi-directional Data Four Minus (BI_D4-)
Advertisement
Table of Contents
Troubleshooting
