Off-hook — In telephony, the term off hook has the following meanings: The condition that exists when a telephone or other user instrument is in use, i.e., during dialing or communicating. Note: off hook originally referred to the condition that prevailed… … Wikipedia
off-hook — 1. In telephone operations, the condition existing when the receiver or handset is removed from its switch. 2. One of the two possible signaling states such as tone or no tone, ground connection or battery connection. 3. The active state … IT glossary of terms, acronyms and abbreviations
Signaling (telecommunications) — In telecommunication, signaling (signalling in British spelling) has the following meanings: the use of signals for controlling communications the information exchange concerning the establishment and control of a telecommunication circuit and… … Wikipedia
Line signaling — is a class of telecommunications signaling protocols. Line signaling is responsible for off hook, ringing signal, answer, ground start, on hook unidirectional supervision messaging in each direction from calling party to called party and vice… … Wikipedia
Multi-frequency signaling — In telephony, multi frequency signaling (MF) is an outdated, in band signaling technique. Numbers were represented in a two out of five code for transmission from a multi frequency sender, to be received by a multi frequency receiver in a distant … Wikipedia
Dual-tone multi-frequency signaling — One of the few production telephone DTMF keypads with all 16 keys, from an Autovon Telephone. The column of red keys produces the A, B, C, and D DTMF events. Dual tone multi frequency signaling (DTMF) is used for telecommunication signaling over… … Wikipedia
Single-frequency signaling — (SF) is line signaling (in telephony) in which dial pulses or supervisory signals are conveyed by a single voice frequency tone in each direction. SF and similar systems were used in 20th century carrier systems.An SF signaling unit converts DC… … Wikipedia
On-hook — In telephony, the term on hook has the following meanings: The condition that exists when a telephone or other user instrument is not in use, i.e., when idle waiting for a call. Note: on hook originally referred to the storage of an idle… … Wikipedia
Telephone exchange — A telephone operator manually connecting calls with cord pairs at a telephone switchboard. In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central… … Wikipedia
telephone — telephoner, n. /tel euh fohn /, n., v., telephoned, telephoning. n. 1. an apparatus, system, or process for transmission of sound or speech to a distant point, esp. by an electric device. v.t. 2. to speak to or summon (a person) by telephone. 3.… … Universalium
