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TS 48.056 (RAN6)
BSC-BTS interface –
Layer 2 specification

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for a better overview, the Table of Contents (ToC) is reproduced
V15.0.0 (PDF)  2018/06  15 p.
V14.0.0  2017/03  16 p.
V13.0.0  2016/01  16 p.
V12.0.0  2014/09  16 p.
V11.0.0  2012/09  16 p.
V10.0.0  2011/04  16 p.
V9.0.0  2009/12  16 p.
V8.0.0  2008/12  16 p.
V7.0.0  2007/09  16 p.
V6.0.0  2005/02  16 p.
V5.0.0  2002/09  16 p.
V4.0.0  2001/05  16 p.
GSM Rel-99 v8.0.1  2002/06  16 p.
GSM Rel-98 v7.0.0  1999/06  16 p.
GSM Rel-97 v6.0.0  1998/10  16 p.
GSM Rel-96 v5.0.0  1996/10  16 p.
GSM Phase-2 v4.0.2  1994/09  16 p.
GSM Phase-1 v3.1.1  1992/02  15 p.

Rapporteur:  Mr. Andersen, Niels Peter Skov

This TS specifies the link layer used for signalling on the A-bis interface between BSC and BTS. The Link Access Procedure on the D-channel (LAPD) specification used on the A-bis interface in the GSM PLMN is a subset of the EN 300 125 which in turn has less options than the CCITT Recommendation Q.921. This description contains first the protocol definitions and second the services provided by the layer 2 to the layer 3.


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