Nortel Networks NN43001-301 - Manual (Page 191)

191
Echo canceller installation
Contents
The section contains information on the following topics:
"Introduction" (page 191)
"Echo canceller operating parameters" (page 191)
"Echo canceller initialization procedures" (page 191)
"PRI to Echo canceller pin assignments" (page 192)
"Electromagnetic Interference" (page 192)
Introduction
Echo cancellers are required only in cases where satellite transmission is
being used. The echo canceller detects the length of the loop, and cancels
out transmission reflections (which result in audible echoes of voices on
satellite-carried calls).
Echo canceller operating parameters
The operational parameters of the echo canceller must be:
• Data transfer rate: 4800 baud
• System unit number: 1
• Display timeout: active
• Failures before alarm: 3
Echo canceller initialization procedures
Each of the 24 channels on the echo canceller must be initialized as shown
here:
• Bypass: OFF
• Off-hook: ON
Nortel Communication Server 1000
ISDN Primary Rate Interface Installation and Commissioning
NN43001-301 02.03 Standard
Release 5.5 7 December 2007
Copyright © 2003-2007, Nortel Networks
.