Telephone Line Emulator User’s Manual
40-400-00020, Rev. M
123
Glossary
Some terms in this glossary were defined with the assistance of Newton’s Telecom
Dictionary. To order a copy, call 1-800-LIBRARY or write to: Telecom Library Inc., 12
West 21 Street, New York, New York 10010.
2500 set
The standard single-line touchtone desk telephone.
ACK
Shorthand term for the DTMF ACKnowledgement issued by a CPE device to request
sending of the FSK Caller ID information
ADSI
Analog Display Services Interface. Defines a protocol on the flow of information between
something (a switch, a server, a voice mail system, a service bureau) and a subscriber’s
telephone, PC, data terminal or other communicating device with a screen.
AST
Advanced Screen Telephony, see ADSI.
Busy Tone
A signal generated by the Central Office indicating that the line you are calling is busy.
Cadence
In voice processing, cadence is used to refer to the pattern of tones and silence intervals
generated by a given audio signal. Examples are busy and ringing tones. A typical
cadence pattern is the US ringing tone, which is two seconds of tone followed by four
seconds of silence. Some other countries, such as the UK, use a double ring, which is two
short tones within about a second, followed by a little over two seconds of silence.
Call Progress Tone
A tone sent from the switch to tell the caller of the progress of the call. Examples are
audible ringing, re-order, busy, timing, etc.
Call Progress Tone Programming
Call progress tones may be single or dual frequencies with individually adjustable
amplitudes. With a selection of “Single Tone” the system will only generate the first tone.
With a selection of “Tone 1 and Tone 2” the system will generate both tones with the
specified frequencies and amplitudes. With a selection of “Tone 1 X Tone 2” the system
will generate Tone 1 modulated by Tone 2. In this implementation only the fundamental
and upper side tone are generated, both at the amplitude programmed for Tone 1.
Call Waiting
Call Waiting is a feature of phone systems that lets you know someone is trying to call
you.
Caller ID
Information about who’s calling and/or their phone number is passed to your phone and is
displayed on special Caller ID equipment.
CAS
CPE Alerting Signal - Bellcore term for tone used to alert CPE equipment of Call Waiting,
asking for ACKnowledgement prior to sending Caller ID.
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