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Appendix A Technical specifications 97
Nortel VPN Router Installation — VPN Router 2750
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.
You connect the quad 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.
For information about the cable pinouts for a crossover connection, see Table 30
on page 95. For information about the cable pinouts for a straight-through
connection, see Table 31 on page 96.
V.90 modem interface card
The V.90 modem interface card has two RJ-11 connectors that provide the signals
needed to interface to an incoming telephone line and to telephone equipment.
Figure 42 shows the V.90 modem interface card.
Figure 42 V.90 modem interface card
Included in the accessory box is a 7-foot RJ-11 cable to attach to a telephone jack.
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