Telco Abbreviations

Abbreviations and useful terms in Telecom.

FDMA    Frequency Division Multiple Access

TDMA    Time Division Multiple Access

CDMA    Code Division Multiple Access

BSS    Base Station Subsystem    

BSC    Base Station Controller    

BTS    Base Transceiver Station    

MSC    Mobile Services Switching Center

OMC    Operation and Maintenance Center

AUC    Authentication Center

EIR    Equipment Identification Register

HLR    Home Location Register    

VLR    Visitor Location Register    

MS    Mobile Station    

PSTN    Public Switched Telephone Network

PLMN    Public Land Mobile Network

EMS    Element Management System

INMS    Integrated Network Management System

NSU    Network Surveillance Unit

NCR    Network Change Request

PAT    Preliminary Acceptance Test

OMC    Operation and Maintenance Center

OSS    Operation Support System

ALV    Alarm List Viewer

TSC    Tendon MSC

TC    Transcoder

TRX    Transceiver

ODU    Outdoor Unit

IDU    Indoor Unit

Dip    Digital Interface Path

RSL    Receive Signal Level (For Transmission)

RWP    Running Without Power

BER    Bit Error Rate

VSWR    Voltage Standing Wave Ratio

MBL    Manually Blocked.

LMT    Local Maintenance Terminal

PMU    Power Management Unit

CDU    Combining and Distribution Unit