Table 29 T1/E1 Csu/Dsu Cable Pinouts For Crossover Connection - Nortel 1750 Install Manual

94 Appendix A Technical specifications
You connect the T1/E1 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.
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Table 29

Table 29 T1/E1 CSU/DSU cable pinouts for crossover connection

Standard-wired
end 8-pin male
1
2
3
4
5
6
7
8
The cable operates properly if you do not connect pins 3, 6, 7, and 8.
NN46110-316 02.01
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. D not interchange the T1/E1 CSU/DSU crossover cable and the
Ethernet crossover cable.
provides the T1/E1 CSU/DSU cable pinouts for a crossover connection.
Signal name
RXDA<-TXDA
RXDB<-TXDB
not used
TXDB->RXDB
TXDA->RXDA
not used
not used
not used
Caution: For crossover connections, do not use Ethernet cable. If you
use Ethernet cable, the T1/E1 CSU/DSU does not work to specifications,
and this condition can corrupt data.
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
Special-wired
end 8-pin male
5
4
3
2
1
6
7
8