ITU G.232:1988
ITU G.232:1988 12-channel Terminal Equipments
Table of Contents
1Attenuationdistortion2Limitsfortheresponseoutsidetheband300to
3400Hz
3Group-delaydistortion
4Stabilityofvirtualcarrierfrequencies
5Carrierleak
5.1Carrierleakswithinthebasicgroupband
60-108kHz
5.2Carrierleaksoutsidethebasicgroupband
60-108kHz
6Protectionagainstharmfulvoltagesurges,clicks,
etc.
7Linearity
8Amplitudelimiting
9Cross-talk
9.1Intelligibleinter-circuitcross-talk
9.2Unintelligiblecross-talkbetweenadjacent
channels
9.3Go-to-returnintelligiblecross-talkofany
channelwithinagroup
9.4Stationcabling
10Noise
11Level,impedanceandreturnlossataudio-frequency
terminals
12Levels,impedanceandreturnlossatthehigh-frequency
terminals
13Protectionandsuppressionofpilots
13.1Protectionandsuppressionofthegroupreference
pilot
13.2Protectionandsuppression,ofthesuper-group
referencepilots
13.3Mutualinterferencebetweenpilotsandout-band
signaling
14Interruptioncontrol
ANNEXA-Calculationoftheattenuationnecessaryfor
protectionorsuppressionofpilots
A.1Disturbanceoftelephonebygroupreference
pilots
A.2Interferenceattheendofasupergrouplink
oragrouplinkduetoheuseofasupergroup
referencepilot
ANNEXB-Exampleofreciprocalprotectionofpilots
andoutbandsignalling
B.1Protectionofpilots
B.2Protectionofsignalling
References