Wiring Information - AT&T Callmaster Series Reference Manual

8434 and 8434DX Voice Terminal

Wiring Information

The 8434 and 8434DX voice terminals work in both 4-wire and 2-wire DCP configurations. The
table below describes the pins on an 8400-Series voice terminal LINE jack.
Notes: Regardless of which configuration is in use, ALL wiring between the PBX and the
terminal MUST consist of twisted-pairs, including the modular line cord. The line
cord must be a D8W, which consists of 4 twisted-pairs, or an AT&T approved
equivalent.
Twisted-pair wiring is used to make lines less sensitive to crosstalk. Therefore,
failure to use twisted pair wiring may result in less-than-optimum performance of
the terminal and may also contribute to problems with the line.
An 8-wire modular cord MUST be used for all 4-wire and any 2-wire installations
requiring auxiliary power.
3-286
LINE INTERFACE
PIN PAIR NAME
1 2 OD1
2 2 OD2
3 3 ID1
4 1 U-T
5 1 U-R
6 3 ID2
7 4 P1-
8 4 P2+
DESCRIPTION
4-Wire Output
4-Wire Output
4-Wire Input
2-Wire (Tip)
2-Wire (Ring)
4-Wire Input
Adjunct Power -48V
Adjunct Power Common