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Appendix A Technical specifications 93
Nortel VPN Router Installation — VPN Router 2700
Figure 40 T1/E1 CSU/DSU WAN interface card (full-height card)
The connector on the T1/E1 CSU/DSU WAN interface accommodates an 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 factory-made 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.
• For a straight-through connection, you can use a standard Category 5
(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.
Table 29 provides the T1/E1 CSU/DSU cable pinouts for a crossover connection.
Note: Nortel does not supply the T1/E1 CSU/DSU WAN interface
cable with the WAN interface card.
Table 29 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
CS160012A