Nortel Networks 1750 manual The cable operates properly if you do not connect pins 3, 4, 5, and

Appendix A Technical specifications 83

The following table provides the 56/64K CSU/DSU cable pinouts for a crossover 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

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 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

Nortel VPN Router Installation — VPN Router 1750