User Manual

AS4000 Central Terminal Installation and
Commissioning
IXL 001
605-0000-432
Issue 1.3a Date 18th October 1999
Page 8 of 10
Abbreviations
AC Alternating Current
AGC Automatic Gain Control
AU Analogue Unit
BER Bit Error Rate
CAS Channel Associated Signalling
CDMA Code Division Multiple Access
CPE Customer Premises Equipment
CRU Customer Radio Unit
CT Central Terminal
DC Direct Current
DMM Digital Multi Meter
DRS Digital Radio System
ERP Effective Radiated Power
HCI Human Computer Interface
ISDN Integrated Services Digital Network
ITU-T International Telecommunications Union -Telecommunications
LCU Level Control Unit
LD Loop Disconnect
LED Light Emitting Diode
MF Multi-Frequency
NTU Network Termination Unit
PC Power Control
POTS Plain Old Telephony Service (analogue)
PSU Power Supply Unit
RF Radio Frequency
Rx Receive
SC Shelf Controller
ST Subscriber Terminal
TU Tributary Unit
Tx Transmit
VDU Video Display Unit
VF Voice Frequency
Definitions
dBm Decibels relative to 1 milli-watt
dBr Decibels relative to the network PCM level
Downlink The communication channel from the CT to the ST
Uplink The communications channel from the ST to the CT
Symbols
IEC Earth