D-Link DFE-908X User Guide - Page 36

Crossover Cables

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Contact 1 2 3 4 5 6 7 8 MDI-X Signal RD+ (receive) RD- (receive) TD+ (transmit) Not used Not used TD- (transmit) Not used Not used MDI Signal TD+ (transmit) TD- (transmit) RD+ (receive) Not used Not used RD- (receive) Not used Not used Crossover Cables When cascading or connecting the hub to another switch, bridge, or hub through the UTP port, a modified crossover cable is necessary. With a crossover cable, two pairs of wires are switched at one connector end. Carry out the following steps to create a customized, crossover twisted-pair cable: 1. Leave one end of the cable as is, with the RJ-45 connector intact. The wiring at just one end of the cable needs to be modified. 2. At the other end of the cable, connect wires 1 and 2 to contacts 3 and 6, respectively. Likewise, connect wires 3 and 6 to contacts 1 and 2. Refer to the following diagram: 24 Cables and Connectors

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Cables and Connectors
24
Contact
MDI-X Signal
MDI Signal
1
RD+ (receive)
TD+ (transmit)
2
RD- (receive)
TD- (transmit)
3
TD+ (transmit)
RD+ (receive)
4
Not used
Not used
5
Not used
Not used
6
TD- (transmit)
RD- (receive)
7
Not used
Not used
8
Not used
Not used
Crossover Cables
When cascading or connecting the hub to another switch, bridge, or hub
through the UTP port, a modified crossover cable is necessary. With a
crossover cable, two pairs of wires are switched at one connector end.
Carry out the following steps to create a customized, crossover twisted-pair
cable:
1.
Leave one end of the cable as is, with the RJ-45 connector intact.
The wiring at just one end of the cable needs to be modified.
2.
At the other end of the cable, connect wires 1 and 2 to contacts 3
and 6, respectively. Likewise, connect wires 3 and 6 to contacts 1
and 2. Refer to the following diagram: