The Digital Subscriber Signalling System No.1 (DSS1) is a suite of protocols that provides the means for users to invoke the full range of services and capabilities available from the Integrated Services Digital Network (ISDN).
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Digital Subscriber Signalling System No.1 (DSS1) – Layer 3 Overview (formerly T1.615-1992 (R2009) )
The Alliance for Telecommunications Industry Solutions , 03/01/1992
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