ITU M.560:1988
ITU M.560:1988 International Telephone Circuits - Principles, Definitions And Relative Transmission Levels
Table of Contents
1General2TheCCITTTransmissionPlan
2.1Principles
2.2Internationaltelephoneconnections
2.3Internationaltelephonecircuits,virtual
analogueswitchingpointsandrelative
transmissionlevels
3Accesspointsforline-upandmaintenancepurposes
Reference