This standard presents the procedures at the S or T reference point for D-channel access connection on basic rate interfaces and primary rate interfaces within the Integrated Services Digital Network (ISDN) to support ISDN user signalling bearer service.
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Digital Subscriber Signalling System Number 1 (DSS1) Signalling Specification for the User Signalling Bearer Service (formerly T1.623-1993 (R2009) )
The Alliance for Telecommunications Industry Solutions , 04/01/1993
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