Reference Manual

Glossary
CCHs Control CHannels, for control
signalling.
⇒ Physical Channel ⇒ Channel
Combination
Logical RU A unit which can be referred to, but is not
a single physical unit. There are three
different kinds of logical RUs:
1. Buses
2. Antennas
3. Environment
LOS Loss Of Signal
LVD Low Voltage Directive
LVF Low Voltage Filter
MAC Medium Access Controller
MADT Mean Accumulated DownTime
Magazine A magazine is a reserved space in the
cabinet, which may hold one or more RUs.
Main RU A main replaceable unit is a replaceable
unit that contains one or more processors,
to which software can be downloaded
from the BSC.
MCB MultiCasting Box
MHS Modification Handling System
Ericsson trouble report database
MMI Man-Machine Interface
MO Managed Object
MR Measurement Receiver
MRT Mean Repair Time
MS Mobile Station
MSC Mobile services Switching Centre
GSM network unit for switching, routing
and controlling calls to and from the
Public Switched Telephone Network
(PSTN) and other networks.
MSTP Mobile Station Test Point
MTBF Mean Time Between Failure
478 (485)
EN/LZT 720 0008 P2A
2001-11-28
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Preliminary