ITU O.11:1992
ITU O.11:1992 Maintenance Access Lines Defines a number of test access lines for manual and automatic maintenance of international circuits.
Table of Contents
1General1.1Introduction
1.2Quietterminationtestline
1.3Testand/orcommunicationsaccessline
1.4Echosuppressortestline
1.5Loop-backtestline
1.6Echocancellertestline
1.7ATMENo.2testlines
1.8Busyflashsignaltestline
2Methodofaccess
2.1Addressinformation
3Specificationsforthetestlineapparatus
3.1Tonesourcecharacteristics(quiettermination
andloop-backtestlines)
3.2Transmittedlevelandtimingintervals(quiet
terminationandloop-backtestlines)
3.3Impedance
3.4Returnloss
3.5Frequencyresponse
3.6Loop-backtestlineleveladjustment
3.7Digitalloop-backtest
4Signallingsystemtestlinetestsequence
4.1Circuitseizure
4.2Testlineanswer
4.3Testlinenotequipped
References