Nortel Networks 2750 Manuale Utente
Appendix A Technical specifications 95
Nortel VPN Router Installation — VPN Router 2750
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.
network using a straight-through cable or a crossover cable, depending on how the
service provider wired its jack.
•
For a straight-through connection, you can use a standard Category 5
(Ethernet) straight-through cable.
(Ethernet) straight-through cable.
•
For a crossover connection, you cannot use a standard Category 5 crossover
cable. Do not interchange the T1/E1 CSU/DSU crossover cable and the
Ethernet crossover cable.
cable. Do 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.
The cable operates properly if you do not connect pins 3, 6, 7, and 8.
Table 30
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,
and this condition can corrupt data.
use Ethernet cable, the T1/E1 CSU/DSU does not work to specifications,
and this condition can corrupt data.