AT&T 555-230-894 用户手册
Wiring Information
September 1995 Issue 1
E-3
Figure E-2.
A Telephone Line Jack in a 4-Wire Configuration
NOTE:
Regardless of configuration, all wiring between the switch and the wall jack
must consist of twisted-pairs. Use the sup plied line cord with the telephone,
or use an AT&T approved equivalent. An 8-wire modular cord
must consist of twisted-pairs. Use the sup plied 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.
such as a hands-free speaker/microphone.
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
1 2 3 4 5 6 7 8