Nortel Networks NN43001-301 Echo canceller installation, Echo canceller operating parameters

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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

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