Digital Subscriber System No. 2

The Digital Subscriber System No.. 2 ( DSS2 ) is a by ITU- T in Recommendation Q.2931 Digital Subscriber Signalling System No.. 2 - User - Network Interface ( UNI) layer 3 specification for basic call / connection control standardized signaling protocol for dial-up connections over ATM broadband networks. It is designed for use between an ATM terminal and the user network interface, and contains the necessary elements for point-to -point connections as well as point-to- multipoint connections. The connection request can be requested a specific data transfer rate of the connection, and also a traffic class, which guarantees for certain transmission qualities contains (for example, CBR and VBR). DSS2 has remained meaningless in practice because the nearly identical signaling protocol of the ATM UNI signaling has prevailed Forum.

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