Nortel Networks 1100, 1050 The cable operates properly if you do not connect pins 3, 6, 7, and

Appendix A Technical specifications 55

Table 23 provides the T1/E1 CSU/DSU cable pinouts for a crossover connection.

Table 23 T1/E1 CSU/DSU cable pinouts for crossover connection

Standard-wired		Pair number	Special-wired
end 8-pin male	Signal name	and conductor	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

The cable operates properly if you do not connect pins 3, 6, 7, and 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 provides the T1/E1 CSU/DSU cable pinouts for a straight-through connection.

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

Nortel VPN Router Installation — VPN Router 1010/1050/1100