Nortel 1000 Features And Services Fundamentals page 433

China - Supervised Analog Lines
Contents
This section contains information on the following topics:
"Feature description" (page 433)
"Operating parameters" (page 434)
"Feature interactions" (page 435)
"Feature packaging" (page 436)
"Feature implementation" (page 436)
"Feature operation" (page 437)
Feature description
The China - Supervised Analog Lines feature provides two types of call
supervision signaling capabilities: battery reversal answer/disconnect
supervision and hook flash disconnect supervision. These forms of
supervision are provided to terminal devices connected to analog ports in
the system.
Battery Reversal Supervision
Battery reversal answer and disconnect supervision signaling is used for
calls originating from the terminal device. It provides both far-end (the called
party) answer supervision and far-end disconnect supervision signals to
the terminal device. It does not apply to incoming calls terminating at the
terminal device.
In the idle state, the analog port in the system provides ground signal on
the tip lead and battery on the ring lead. This polarity is maintained during
dialing and ringing at the far end. When the far end answers, the battery
and ground connections are reversed. The reverse battery is maintained
while the call is established. When the far end disconnects, the battery and
ground connections are reverted to the idle state to signal that the far end
Copyright © 1994–2008, Nortel Networks
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Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
433