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ETSI GTS GSM 08.56
- Digital cellular telecommunications system; Base Station Controller - Base Transceiver Station (BSC - BTS) interface; Layer 2 specification (GSM 08.56)
- standard by European Telecommunications Standards Institute, 12/01/1996
- Publisher: ETSI
$11.00$21.51
This Global System for Mobile communications Technical Specification ( GTS) specifies the link layer used for signalling on the A-bis interfa ce between Base Station Controller (BSC) and Base Transceiver Station (BTS). The use and general aspects of the A-bis interface are describe d in GSM 08.51 and the interface aspects in GSM 08.52. The Link Access Procedure on the D-channel (LAPD) specification used o n the A-bis interface in the GSM PLMN is a subset of the ETS 300 125 w hich in turn has less options than the CCITT Recommendation Q.921. This description contains first the protocol definitions and second th e services provided by the layer 2 to the layer 3.