AT&T 555-230-894 manual Bl-W

Wiring Information

1 2 3 4 5 6 7 8

Figure E-2. A Telephone Line Jack in a 4-Wire Configuration

Table E-1. Pinouts on 8-Pin Line Jack

Modular Wall Jack Wiring
Pin	Pair	Color	Description
1	2	W-O	4-Wire Output
2	2	O-W	4-Wire Output
3	3	W-G	4-Wire Input
4	1	BL-W	2-Wire (Tip)
5	1	W-BL	2-Wire (Ring)
6	3	G-W	4-Wire Input
7	4	W-BR	Adjunct Power -48V
8	4	BR-W	Adjunct Power Common

NOTE:

Regardless of configuration, all wiring between the switch and the wall jack must consist of twisted-pairs. Use the supplied line cord with the telephone, or use an AT&T approved equivalent. An 8-wire modular cord must be used for all 4-wire and 2-wire installations requiring auxiliary power for adjuncts such as a hands-free speaker/microphone.

September 1995 Issue 1 E-3