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Appendix A Technical specifications 55
Nortel VPN Router Installation — VPN Router 1010/1050/1100
Table 23 provides the T1/E1 CSU/DSU cable pinouts for a crossover connection.
The cable operates properly if you do not connect pins 3, 6, 7, and 8.
Table 24 provides the T1/E1 CSU/DSU cable pinouts for a straight-through
connection.
Table 23 T1/E1 CSU/DSU cable pinouts for crossover connection
Standard-wired
end 8-pin male Signal name
Pair number
and conductor
Special-wired
end 8-pin male
1 RXDA<-TXDA wht/org pair 2A 5
2 RXDB<-TXDB orange pair 2B 4
3 not used wht/grn pair 3A 3
4 TXDB->RXDB blue pair 1B 2
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 the data.
Table 24 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