Nortel Networks 2750 manual Modem interface card, modem interface card

Appendix A Technical specifications 97

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

PHONE LINE

Included in the accessory box is a 7-foot RJ-11 cable to attach to a telephone jack.

Nortel VPN Router Installation — VPN Router 2750