ITU G.108.2:2007
ITU G.108.2:2007 Transmission Planning Aspects Of Echo Cancellers Provides guidance for the transmission planning aspects in conjunction with the deployment of echo cancellers in the network.
Table of Contents
1Introduction2References
3Definitions
4Abbreviationsandacronyms
5Conventions
6Echocontrolintelecommunicationnetworks
6.1Echocontroldevices
6.2GeneralechocontrolconsiderationsfromaPSTNperspective
6.3Additionalechocontrolconsiderationsfromtheperspective
ofinterconnectednetworks(e.g.,privatenetworks,
theInternet)
6.4Application-relatedechocontrolconsiderations
6.5Voicebanddatamodemconstraints
7Applicationrulesandoperationalconstraints
7.1Publicnetworktransmissionplanning
7.2Delayconsiderations
7.3Provisioningoftheecho-pathcapacityandecho-path
characteristics
7.4Echocancellertransmissionplanningformultiple
interconnectednetworks(e.g.,public,private,Internet)
8Networkandserviceevolutionaryconsiderations
8.1Bittransparencyofechocancellers
8.2Non-linearitiesandtime-varianteffectsintheechopath
8.3Lowbit-ratecodingbetweentandemcancellers
8.4Tandemingofechocancellers
8.5Convergencespeed
8.6Acousticechocontrolandenvironments
8.7Newcircuit-switchedservice
8.8Comfortnoise
9SpecialCMEnetworkingconsiderations
9.1Detailedinteraction
9.2Possiblesolutions
AppendixI-Echo-pathdispersiontime
I.1Echo-pathcharacteristicsfrommeasurementsinNorth
America
AppendixII-Multipletailcircuits
II.1Multipletailsinatypicalbridgedtelephonecall
(NorthAmerica)