B-3
Twisted-Pair Cable and Pin Assignments
B
Crossover Wiring
If the twisted-pair cable is to join two ports and either both ports are labeled with an
“X” (MDI-X) or neither port is labeled with an “X” (MDI), a crossover must be
implemented in the wiring. (When auto-negotiation is enabled for any RJ-45 port on
these switches, you can use either straight-through or crossover cable to connect to
any device type.)
You must connect all four wire pairs as shown in the following diagram to support
Gigabit Ethernet connections.
Figure B-3 Crossover Wiring
1000BASE-T Pin Assignments
All 1000BASE-T ports on this switch 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_DA+) Bi-directional Data Two Plus (BI_DB+)
2 Bi-directional Data One Minus (BI_DA-) Bi-directional Data Two Minus (BI_DB-)
3 Bi-directional Data Two Plus (BI_DB+) Bi-directional Data One Plus (BI_DA+)
4 Bi-directional Data Three Plus (BI_DC+) Bi-directional Data Four Plus (BI_DD+)
White/Orange Stripe
Orange
White/Green Stripe
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
EIA
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