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Table 21
provides the T1/E1 CSU/DSU cable pinouts for a crossover connection.
Table 21 T1/E1 CSU/DSU cable pinouts for crossover connection
Standard-wired
end 8-pin male
Signal name
1
RXDA<-TXDA
2
RXDB<-TXDB
3
not used
4
TXDB->RXDB
5
TXDA->RXDA
6
not used
7
not used
8
not used
The cable will operate properly if pins 3, 6, 7, and 8 are not connected.
Caution: For crossover connections, do not use Ethernet cable. The
T1/E1 CSU/DSU will not work to specifications. Data may be corrupted.
Table 22
provides the T1/E1 CSU/DSU cable pinouts for a straight-through
connection.
Table 22 T1/E1 CSU/DSU cable pinouts for straight-through connection
Nortel Networks termination
Signal
Receive A (RXDA)
Receive B (RXDB)
not used
Transmit B (TXDB)
Transmit A (TXDA)
not used
not used
not used
Appendix A Technical specifications 45
Pair number
and conductor
wht/org pair 2A
orange pair 2B
wht/grn pair 3A
blue pair 1B
wht/blu pair 1A
green pair 3B
wht/brn pair 4A
brown pair 4B
Remote termination
Pin # to Pin #
Signal
1
1
Receive A (RXDA)
2
2
Receive B (RXDB)
3
3
not used
4
4
Transmit B (TXDB)
5
5
Transmit A (TXDA)
6
6
not used
7
7
not used
8
8
not used
Installing the Contivity 1010/1050/1100
Special-wired
end 8-pin male
5
4
3
2
1
6
7
8
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