User Manual

AS4000 Access Concentrator
Installation and Commissioning
IXL 001
605-0000-453
Issue 1.2dr Date 7/02/00
Page 6 of 6
Abbreviations
AC Alternating Current
AGC Automatic Gain Control
AU Analogue Unit
A/D Analogue/Digital
CPE Customer Premises Equipment
CRU Customer Radio Unit
CT Central Terminal
CTU Concentrated Tributary Unit (Access Terminal Shelves)
CU Compression Unit
DA Demand Assignment
DC Direct Current
DMM Digital Multi Meter
DRS Digital Radio System
DTU Demand Assignment Tributary Unit
FA Fixed Assignment
ISDN Integrated Services Digital Network
ITU-T International Telecommunications Union -Telecommunications
LD Loop Disconnect
LED Light Emitting Diode
MF Multi-Frequency
MSTP Modem Shelf Termination Panel
MU Modem Unit
NTU Network Termination Unit
PC Power Control
PSU Power Supply Unit
RF Radio Frequency
SC Shelf Controller
SPU Signalling Processing Unit
ST Subscriber Terminal
Rx Receive
Tx Transmit
TU8 Tributary Unit Eight E1 ports
VDU Video Display Unit
VF Voice Frequency
XTU Exchange Tributary Unit (E1 protocol: CAS, V5.1, V5.2)