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Nortel Networks 2700 User Manual

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  Appendix A  Technical specifications
NN46110-311 02.01
The cable operates properly if you do not connect pins 3, 6, 7, and 8.
 provides the T1/E1 CSU/DSU cable pinouts for a straight-through 
connection.
5
TXDA->RXDA
wht/blu pair 1A
1
6
not used
green pair 3B
6
7
not used
wht/brn pair 4A
7
8
not used
brown pair 4B
8
Caution: For crossover connections, do not use Ethernet cable. If you 
use Ethernet cable the T1/E1 CSU/DSU does not work to specifications. 
This condition can corrupt data.
Table 30   
T1/E1 CSU/DSU cable pinouts for straight-through connection
Nortel termination
Remote termination
Signal
Pin # to Pin #
Signal
Receive A (RXDA)
1
1
Receive A (RXDA)
Receive B (RXDB)
2
2
Receive B (RXDB)
not used
3
3
not used
Transmit B (TXDB)
4
4
Transmit B (TXDB)
Transmit A (TXDA)
5
5
Transmit A (TXDA)
not used
6
6
not used
not used
7
7
not used
not used
8
8
not used
Table 29   
T1/E1 CSU/DSU cable pinouts for crossover connection (continued)
Standard-wired 
 
end 8-pin male
Signal name
Pair number 
 
and conductor
Special-wired
 
end 8-pin male