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APPENDIX 3 ABBREVIATIONS AND GLOSSARY OF TERMS
ACS
Call Control
Checksum Error
Destination Number The destination number is the number that is dialled to reach the called
Force Route
Hz
LED
mA
MF4 Dialling
ms
NU Tone
PABX
PIN
pps
Prefer Route
PSTN
RAM
REN
Ring
8380-383-115-BA
Issue 2, June 1999
Represents a burst of 400 Hertz tone transmitted over the phone to the
subscriber.
Access Control Sequence.
Toll Control.
An error that occurs when the sum value of the programming database is
changed by means other than conventional programming.
party.
The route can not be changed to another route by any means once the
decision has been made in the Search Tables.
Hertz.
Light Emitting Diode.
Milliamperes.
MF4 tone dialling.
Milliseconds.
Number Unobtainable Tone.
Public Automatic Branch Exchange.
Personal Identification Number.
Pulses per second.
A preferred route begins the routing process on the route indicated by
the action code. However, this route may be changed if another prefer,
force or select route action code is encountered within a Search Table.
Public Switched Telephone Network.
Random Access Memory.
Ringer Equivalence Number.
B-Wire.
Appendix 3 Abbreviations and Glossary of Terms
90
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