Nortel Networks Accelar 1050 - Manual (Page 50)

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Appendix A Technical specifications
NN46110-313 02.01
Use cable that is wired in accordance with EIA-568-A wiring style. This wiring
style ensures that a twisted pair inside the patch cord carries the transmit signal
(pins 1 and 2) and the receive signal (pins 7 and 8). Nortel strongly recommends
that you use factory-made patch cords.
You connect the 56/64K CSU/DSU WAN interface card to the service provider
network using a straight-through cable or a crossover cable, depending on how the
service provider wired its jack.
• For a straight-through connection, you can use a standard Category 5
(Ethernet) straight-through cable.
• For a crossover connection, you cannot use a standard Category 5 crossover
cable. Do not interchange the 56/64K CSU/DSU crossover cable and the
Ethernet crossover cable.
Table 18 provides the 56/64K CSU/DSU cable pinouts for a crossover
connection.
The cable operates properly if you do not connect pins 3, 4, 5, and 6.
Table 18 56/64K CSU/DSU cable pinouts for crossover connection
Nortel termination Remote termination
Signal Pin # to Pin # Signal
Transmit tip 1 7 Receive tip
Transmit ring 2 8 Receive ring
not used 3 3 not used
not used 4 4 not used
not used 5 5 not used
not used 6 6 not used
Receive tip 7 1 Transmit tip
Receive ring 8 2 Transmit ring
Caution: For crossover connections, do not use Ethernet cable. If you
use Ethernet cable, the link cannot be established.