SS-ETS-300138-1 › Historical Revision Information
Integrated Service Digital Network (ISDN) - Closed User Group (CUG) supplementary service - DigitalSubscriber Signalling System No. one (DSS1) protocol
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33.020 (Telecommunications in general Including infrastructure)
Designation Name
SS-ETS 300138-1
Revision Level
EDITION 1
Status
Superseded
Publication Date
Nov. 16, 1992
Language(s)
English