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Appendix A: 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 Touch-Tone desk telephone.
ACK
Shorthand term for the DTMF ACKnowledement issued by a CPE device to request sending of
the FSK Caller ID information
Busy Tone
A signal generated by the Central Office indicating that the line you are calling is busy.
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.
CAS
CPE Alerting Signal - BellCore term for tone used to alert CPE equipment of Call Waiting,
asking for ACKnowledgement prior to sending Caller ID.
Central Office
Telephone company facility where subscribers’ lines are joined to switching equipment for
connecting other subscribers to each other, locally and long distance. (Also called CO.)
CIDCW
Caller ID in Call Waiting - BellCore term for Caller ID sent during an active call
DTMF
Also called Touch-tone. Dual-tone multi-frequency. Push-button telephone signaling.
Forced disconnect
Method used by the telephone company to clear a line. When the called party goes on-hook, the
Central Office returns an open (that is, drops loop current) of at least 800 ms to the calling party.
This is also known as Calling Party Control (CPC), or Cutoff On Disconnect (COD), or
Disconnect Supervision.
FSK
Frequency Shift Keying - A modulation technique that defines bits 0 and 1 as different
frequencies for use in analog data transmissions
Ground start
One of two types of switched telephone lines (outside lines) typically leased from telephone
companies, the other type being loop start. A ground start telephone line initiates an outgoing
telephone line seizure by applying a local resistance up to 550 ohms from ground to the tip
conductor.
Key Telephone System
A telephone system in which the telephones have multiple buttons that permit a user to select
outgoing or incoming Central Office phone lines directly.
Loop start
One of two types of switched telephone lines (outside lines) typically leased from telephone
companies, the other type being ground start. A loop start telephone line is seized by connecting
a low resistance between the tip and ring (both wires) of the telephone line. This occurs
whenever a telephone or modem goes off-hook. If you need to find out if a line is loop start, call
the telephone company.
TLS-5 Reference Manual
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