User Manual

RBS 2000Glossary
CCCH
Common Control CHannel
Channel combining the following common control
channels:
• PCH Paging CHannel
• RACH Random Access CHannel
• AGCH Access Grant CHannel
CCU
Climate Control Unit
CDU
Combining and Distribution Unit
CE
Conformité Européenne
cell An area of radio coverage identified by the GSM
network by means of the cell identity.
CEU
Coverage Extension Unit
CF
Central Functions
channel The common term channel denotes the virtual
connection, consisting of physical and logical channels,
between BSS and MS, during a call in progress.
 Logical Channel  Physical Channel
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
Macro = Control Module (for TMA)
Micro = Common Mode
CMD
Digital Radio Communication Tester
CMRU
Central Main Replaceable Unit.
The RBS is physically connected to the Base Station
Controller (BSC) via the CMRU. There is only one
CMRU in each RBS (DXU or IXU). In RBSs without
DXU or IXU the whole RBS is regarded as CMRU.
Macro: CMRU = DXU
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N/LZT 720 0283 Uen R2A