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Conductor
White w/blue stripe
Blue w/white stripe
White w/orange stripe
Orange w/white stripe
White w/green stripe
Green w/white stripe
White w/brown stripe
Brown w/white stripe
Crossover cables are used to connect switches to other switches or CABs directly to the CM-1.
A crossover cable is terminated the same way as a normal cable, except that the TX and RX
pins are swapped at one end to allow the transmit pair of one device to connect to the receive
pair of the other.
Normally, this crossover action is done within the switch, which is why you use a
straight-through cable most of the time. It is very easy to tell the difference between a
crossover cable and a straight-through cable by looking at the conductors in the 8P8C modular
(RJ-45) connectors. If the wiring is identical at both ends, you are looking at a straight-through
cable. If it is different, you most likely have a crossover cable, or possibly, an incorrectly
terminated cable. Look carefully at the color of the conductors.
Note: Some switches include uplink ports. These ports are intended to serve as a connection to
another switch. As such, the uplink port is wired to use a straight-through cable instead of
requiring a crossover cable. On some switches, uplink ports share their connection with an
adjacent port, so be sure to read the manufacturer's instructions for proper use.
June 11, 2012
Wire pair
1
1
2
2
3
3
4
4
Version 1.6.4b.1
Connector pin
Function
5
Not used
4
Not used
1 (3 x-over)
TX +
2 (6 x-over)
TX -
3 (1 x-over)
RX +
6 (2 x-over)
RX -
7
Not used
8
Not used
CAB 4n Hardware Manual
27
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