Chapter 1. Introduction
61200.080L1-1
FXS+ Dual Voice Option Module
1
Chapter 1
Introduction
FXS+ DUAL VOICE OVERVIEW
The FXS+ Dual Voice (FXS+) option module is one of
the option modules available for use with the ADTRAN
TSU 100/600. The FXS+ module provides two 2-wire
voice-grade interfaces serving as the source of line-
current and ringing voltage to a telephone or station
interface. The FXS+ may serve as the station-side of a
foreign exchange fxs/fxo application.
When used with an ADTRAN FXO+, analog message-
waiting functions may be extended over the T-span to an
analog message-waiting telephone. The FXS+ card
provides the necessary voltages to light the message-
waiting light.
The FXS+ may also be paired with another FXS+ to
provide a hot-line or private line automatic ringdown
(PLAR) function to a remote location at the far end of
the T-span. When the FXS+ is used in the Tandem
mode, it can be set to accept phone service directly from
a toll switch (e.g., 1-800 services, Megacom
®
) using E &
M signaling on the T-span. It may also be used to
provide trunk services to a PBX from a local switch. The
FXS+ is intended for use in applications where the
2-wire port wiring remains on premises. Signaling and
interfaces comply with portions of EIA/TIA-464-A,
T1.401, and AT&T Pub. 41458 and Pub. 43801.
The FXS+ option module also accepts the FXS+ plug-on
board to provide up to four FXS+ functional ports per
option slot used.
