Table of Contents
1Scope
2References
3Definitions
4Abbreviations
5Digitalmodem
6Analoguemodem
6.1Datasignallingrates
6.2Symbolrate
6.3Scrambler
6.4Transmitter
7Interchangecircuits
7.1Listofinterchangecircuits
7.2Asynchronouscharacter-modeinterfacing
8Signalsandsequences
8.1FullPhase1
8.2ShortPhase1signalsandsequencesforthe
analoguemodem
8.3ShortPhase1signalsandsequencesforthe
digitalmodem
8.4FullandshortPhase2signalsandsequences
8.5Phase3signalsfortheanaloguemodem
8.6Phase3,signalsforthedigitalmodem
8.7Phase4,RateRenegotiationandFast
ParameterExchangesignalsfortheanaloguemodem
8.8Phase4,RateRenegotiationandFast
ParameterExchangesignalsforthedigitalmodem
8.9Modem-on-hold
9Operatingprocedures
9.1FullPhase1-Networkinteraction
9.2ShortPhase1-Networkinteraction
9.3FullPhase2-Probing/ranging
9.4ShortPhase2-Ranging
9.5Phase3-Equalizerandechocanceller
traininganddigitalimpairmentlearning
9.6Phase4-Finaltraining
9.7Retrains
9.8Raterenegotiation
9.9Fastparameterexchange
9.10Modem-on-hold
9.11Cleardown
10Testingfacilities Abstract
Provides information regarding digital and analogue modems for use on the Public Switched Telephone Network (PSTN) at data signalling rates up to 56 000 bit/s downstream and up to 48 000 bit/s upstream, with reduced start-up time on recognized connections. Also provides procedures to support modem-on-hold in response to call-waiting events or outgoing call requests.
