Teltone m-392 Guida Utente

Many of the terms in this glossary were defined with the assistance of Newton’s Telecom
Dictionary, by Harry Newton. To order a copy, call 1-800-LIBRARY or write to: Telecom
Library Inc., 12 West 21 Street, New York, New York 10010.

The standard single-line touch-tone desk telephone.

A feature of telephone systems that allows a caller to dial one or two digits to place a call. The system translates
the digits to the actual number being called. Also known as “speed dialing”.

A signal generated by the central office indicating that the line you are calling is busy.

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.

Telephone company facility where subscriber’s lines are joined to switching equipment for connecting other
subscribers to each other, locally and long distance. (Also called CO.)

Business telephone service offered by a local telephone company from a local central office. Centrex is leased
to businesses as a substitute for a business-owned PBX or key telephone system.

A calling tone issued by a fax device to inform a terminating point that the incoming call is from a facsimile
machine.

Cutoff On Disconnect. This signal, a momentary break of greater that 800mS, is issued by the Central Office
Switching Equipment to attempt a Forced Disconnect.

A decibel is a unit of measure of signal strength.

Dual-tone multi-frequency. Push-button telephone signaling. When you touch a button on a push-button pad, it
makes a tone, actually a combination of two tones, one high-frequency and one low-frequency.

A setting programmed by Teltone. You can change this value with one of the programming commands. If
necessary, you can use the Restore Defaults command to return to factory defaults.

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).

One of two types of switched trunks (outside lines) typically leased from telephone companies, the other type
being “loop start”. A ground start trunk initiates an outgoing trunk seizure by applying a local resistance up to
550 ohms from ground to the tip conductor.

A person who tries to break into computer or telephone systems, usually by a series of trial-and-error attempts
to break the password.

40-400-00015, Rev. 

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