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Private Telecommunication Networks - signalling at the S reference point - data link layer protocol (PTN SSIG-L2)

4th edition, June 1993

This Standard specifies the characteristics of the data link layer protocol for use on the D-channel at the S reference point provided by a Private Telecommunication Network (PTN). The purpose of the data link layer protocol is to convey information between network layer entities using the D-channel.

This Standard is applicable to Terminal Equipment (TE) (including Terminal Adaptors) and Private Telecommunication Network Exchanges (PTNXs) interconnected at the S reference point.

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Technical CommitteeTC32


  • ECMA-105, 1st edition, September 1985Download
  • ECMA-105, 2nd edition, December 1987 Download
  • ECMA-105, 3rd edition, June 1990Download