Glossary
HWU Hardware Unit
An HWU consists of one or more SEs. An
HWU is a functional unit within the RBS.
The HWU is either active (equipped with a
processor) or passive (without processor).
ID Identification
IDB Installation DataBase
IEC International Electric Commission
INT Internal
IS Interface Switch
I1A Internal Fault Map Class 1A
I1B Internal Fault Map Class 1B
I2A Internal Fault Map Class 2A
JTC Joint Technical Committee
LAPD Link Access Procedures on D-channel
LAPD is the data link layer (layer 2)
protocol used for communication between
the BSC and the BTS on the Abis
interface.
Abis layer 2 is sometimes used
synonymously with LAPD.
LBO Line Build Out
LED Light Emitting Diode
LLB Line Loop Back
LNA Low Noise Amplifier
Local bus The local bus offers communication
between a central main RU (DXU) and
distributed main RUs (TRU and ECU).
Local mode When the RU is in RU mode Local it is
not prepared for BSC communication.
Local/Remote switch Using the Local/Remote switch, an
operator orders the RU to enter Local or
Remote mode.
LOF Loss Of Frame
Logical Channel A logical channel represents a specified
portion of the informationcarrying
capacity of a physical channel.
EN/LZT 123 2697 R5A
1998-08-13
301 (306)
© Ericsson Radio Systems AB
— All Rights Reserved —
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