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ETSI TS 100 595
M00001162
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ETSI TS 100 595 Digital cellular telecommunications system (Phase 2+); BSC-BTS Layer 2; Specification (3GPP TS 08.56 version 8.0.1 Release 1999)
standard by European Telecommunications Standards Institute, 05/01/2002
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Full Description
The present document specifies the link layer used for signalling on the A-bis interface between BSC and BTS. The use and general aspects of the A-bis interface are described in 3GPP TS 08.51 and the interface aspects in 3GPP TS 08.52.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 ETS 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.