Reference Manual

Glossary
Channel Combination A physical channel on an air interface
carrying a defined set of logical channels.
Channel group A channel group is a group of dedicated
logical channels to a specific MS.
CM Control Module (for TMA)
CMD Digital Radio Communication Tester
CMRU Central Main Replaceable Unit. Main RU.
The RBS is physically connected to the
Base Station Controller (BSC) via the
CMRU. There is only one CMRU in each
RBS.
CNU Combining Network Unit
Compr Compressor
CON LAPD concentrator
LAPD concentration is used to reduce the
number of required physical links between
the BSC and BTS.
Config Configuration
Co-siting Co-siting is the operation of a radio base
station in GSM together with the radio
base station in Total Access
Communication System (TACS) or Nordic
Mobile Telephone system (NMT) on the
same site by sharing common equipment.
CPI Communication and Power Interface
CPI Customer Product Information
CPU Central Processing Unit
CRC Cyclic Redundancy Check
CS Coding Scheme
CSA Canadian Standards Association
CSES Consecutive Severely Errored Second
CSU Channel Service Unit
CU Combining Unit (RU in CDU_D)
CXU Configuration Switch Unit
Dannie ASIC in the TRU
DB DataBase
472 (485)
EN/LZT 720 0008 P2A
2001-11-28
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Preliminary