ADTRAN 1200103L2, Руководство пользователя

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Chapter 1. Introduction
61200.103L2-1 FXO+ Dual Voice Option Module User Manual
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Chapter 1
Introduction
FXO+ DUAL VOICE OVERVIEW
The FXO+ Dual Voice (FXO+) option module is one of
the option modules available for use with the
ADTRAN TSU 100/120/600. The FXO+ module
provides two 2-wire voice-grade interfaces serving as
the loop termination for central office line current and
ringing voltage.
The FXO+ module emulates a telephone or station
interface. It responds to signaling from the digital
signal, level 1 (DS1) stream by providing loop closure
or ring ground to the 2-wire interface. The condition
of tip-ground and ringing on the 2-wire interface is
converted to signaling out the DS1 stream. The FXO+
may serve as the office side of a foreign exchange
FXO/FXS application. The FXO+ may be used with
the ADTRAN FXS+ to implement message-waiting
with analog message-waiting phones that need -150
VDC to light the message lamp. The FXO+ module
features on-hook data transmission for passing Caller
ID data from the 2-wire interface to the DS1 stream.
When the FXO+ is used in the dial pulse terminate
(DPT) mode with E&M signaling on the DS1 stream, it
extends the central office side of an analog direct
inward dial (DID) trunk to the customer premises.
The FXO+ may be used to connect to the station side
of a private branch exchange (PBX). Signaling and
interfaces comply with portions of EIA/TIA-464-A