Nortel Networks 1750 manual V.90 modem interface card, Phone, Line

90 Appendix A Technical specifications

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.

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 the 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 “T1/E1 CSU/DSU cable pinouts for crossover connection” on page 88. For information about the cable pinouts for a straight-through connection, see “T1/E1 CSU/DSU cable pinouts for straight-through connection” on page 89.

V.90 modem interface card

The V.90 modem interface card has two RJ-11 connectors that provide the signals to interface to an incoming telephone line and to telephone equipment. The following figure shows the V.90 modem interface card.

Figure 32 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.

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