Nortel 1100 安装指导
Appendix A Technical specifications 197
Nortel VPN Router Installation — Hardware Options
The connector on the T1/E1 CSU/DSU WAN interface card accommodates an
8-pin RJ-48 modular patch cord. These cables are sold as Category 5, or Ethernet,
cables.
8-pin RJ-48 modular patch cord. These cables are sold as Category 5, or Ethernet,
cables.
Use cable that is wired in accordance with EIA-568-A wiring style. This wiring
style ensures that a twisted pair inside the patch cord carries the transmit signal
(pins 4 and 5) and the receive signal (pins 1 and 2). Nortel strongly recommends
that you use professionally manufactured patch cords.
style ensures that a twisted pair inside the patch cord carries the transmit signal
(pins 4 and 5) and the receive signal (pins 1 and 2). Nortel strongly recommends
that you use professionally manufactured patch cords.
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. You cannot interchange the T1/E1 CSU/DSU crossover cable and the
Ethernet crossover cable.
cable. You cannot 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.
Note: Nortel does not supply an interface cable with the
T1/E1 CSU/DSU WAN interface card.
Table 27
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