ATIS 1000623.2014 (R2019)
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Digital Subscriber Signaling System No. 1 (DSS1) – Signaling Specification for the User Signaling Bearer Service
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. Formerly known as T1.623-1993(R2009).
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