AT&T 555-230-894 Wiring Information, Figure E-1. a Telephone Line Jack in a 2-Wire Configuration

Installing the 9400-Series Telephones

NOTE:

The 3BIC and 3BEW protectors can be used only for 2-wire installations. They cannot be used for 4-wire installations.

These telephones are not for residential use. They are for business systems applications only. Use in a residential environment could result in an electrical short circuit when the telephone wiring is set up to provide other applications, for example, for appliance control or power transformers. The AC power used in these applications may create a safety hazard by placing a direct short circuit across the telephone wiring.

Wiring Information

The 9403 and the 9434 telephones work in both 2-wire and 4-wire configurations. The 9410 telephone works only in the 2-wire digital communications protocol (DCP) configuration. Wiring is also discussed in Chapter 9, "Install and Wire Telephones and Other Equipment".

Figure E-1and Figure E-2show an enlargement of a telephone 8-pin line jack in a 2-wire and a 4-wire configuration, respectively. Table E-1below these figures describes the pins on this jack.

Figure E-1shows power requirements in a 2-wire installation. Switch connections must be on pair 1 (Pins 4 and 5).

1 2 3 4 5 6 7 8

Figure E-1. A Telephone Line Jack in a 2-Wire Configuration

Figure E-2shows power requirements in a 4-wire installation. Switch connections must be on pair 2 (Pins 1 and 2) and pair 3 (Pins 3 and 6).

E-2September 1995 Issue 1