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Appendix A Technical specifications 83
Nortel VPN Router Installation — VPN Router 1750
The following table 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.
The following table provides the 56/64K CSU/DSU cable pinouts for a
straight-through connection.
Table 23 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
Table 24 56/64K CSU/DSU cable pinouts for straight-through connection
Nortel termination Remote termination
Signal Pin # to Pin # Signal
Transmit tip 1 1 Transmit tip
Transmit ring 2 2 Transmit 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 7 Receive tip
Receive ring 8 8 Receive ring