3 Definitions and abbreviations

08.563GPPBSC-BTS Layer 2SpecificationTS

The following abbreviations and acronyms are used in the present document.

Ai Action indicator

BCF Base Station Control Function

BSC Base Station Controller

BTS Base Transceiver Station

C/R Command/Response field bit

GSM Global System for Mobile communication

L2ML Layer 2 Management Link

LAPD Link Access Procedure on the D-Channel

MPH- Communication between Management and PHysical layer

MS Mobile Station

N(S) Send sequence variable

O&M Operation and Maintenance

OML Operation and Maintenance Link

PH- Communication between data link layer and PHysical layer

PLMN Public Land Mobile Network

Ri Reference number

RSL Radio Signalling Link

SAP Service Access Point

SAPI Service Access Point Identifier

SMS Short Message Service

TEI Terminal Endpoint Identifier

TRX Transceiver

XID EXchange IDentification