ITU M.390:1988
ITU M.390:1988 Numbering In Systems On Symmetric Pair Cable
Table of Contents
1Systemsproviding12telephonecarriercircuitsonasymmetricpairincable(1212)systems
2Systemsprovidingfivegroupsorless
2.1Numberinginsystemscomprisingbotherectand
invertedgroups
2.2Numberinginsystemswithinvertedgroups
2.3Systemswithfourgroups
3Systemsprovidingtwosuper-groups
3.1Alternativefrequencyarrangements
3.2Numberingofsuper-groups,groupsandchannels