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Information about On Hook

In telephony, the term on-hook has the following meanings:
  1. 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 telephone receiver, i.e., separate earpiece, on a switchhook. The weight of the receiver depresses the spring loaded switchhook thereby disconnecting the idle instrument (except its bell) from the telephone line.
  2. One of two possible signaling states, such as tone or no tone, or ground connection versus battery connection. Note: if on-hook pertains to one state, off-hook pertains to the other.
  3. The idle state, i.e., an open loop of a subscriber line or PBX user loop.
  4. An operating state of a communications link in which data transmission is disabled and a high impedance, or "open circuit", is presented to the link by the end instrument(s). Note: during the on-hook condition, the link is responsive to ringing signals.


The act of going on-hook is also referred to as releasing the line or channel.

This article contains material from the Federal Standard 1037C (in support of MIL-STD-188), which, as a work of the United States Government, is in the public domain.


See also disconnect supervision.
In telecommunication, telephony (IPA pronunciation: [tə'lɛfəˌni]) encompasses the general use of equipment to provide voice communication over distances, specifically by connecting telephones to each other.
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The telephone is a telecommunications device which is used to transmit and receive sound (most commonly speech). Most telephones operate through transmission of electric signals over a complex telephone network which allows almost any phone user to communicate with almost anyone.
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In telecommunications, a user is a person, organization, or other entity that employs the services provided by a telecommunication system, or by an information processing system, for transfer of information.
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Headphones (also known as earphones, earbuds, stereophones, headsets, or by the slang term cans) are a pair of tiny loudspeakers, or less commonly a single speaker, with a way of holding them close to a user's ears and a means of connecting them
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worldwide view.
For the Electric Light Orchestra song, see .
A telephone line or telephone circuit (or just line or circuit within the industry) is a single-user circuit on a telephone communications system.
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In telecommunication, signalling (UK spelling) or signaling (US spelling) has the following meanings:
  • The use of signals for controlling communications.

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Ground may refer to:
  • The surface of the Earth
  • Soil, a mixture of sand and organic material present on the surface of the Earth
  • Ground (electricity), in electrical engineering, something that is connected to the Earth or at the voltage defined as zero (in the U.S.

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An electrical connection between discrete points allows the flow of electrons, (current). A pair of connections is needed for a circuit.

Between points with a low voltage difference between them, direct current flow can be controlled by a switch.
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In telephony, the term off-hook has the following meanings:
  1. The condition that exists when a telephone or other user instrument is in use, i.e., during dialing or communicating.

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In telephony, the local loop (also referred to as a subscriber line) is the physical link or circuit, that connects from the demarcation point of the customer premises to the edge of the carrier, or telecommunications service provider, network.
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Private Branch eXchange (PBX) is a telephone exchange that serves a particular business or office, as opposed to one that a common carrier or telephone company operates for many businesses or for the general public.
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Telecommunication is the transmission of signals over a distance for the purpose of communication. In modern times, this process typically involves the sending of electromagnetic waves by electronic transmitters, but in earlier times telecommunication may have involved the use of
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data link is the means of connecting one location to another for the purpose of transmitting and receiving data. It can also be an assembly, consisting of parts of two data terminal equipments (DTEs) and the interconnecting data circuit, that is controlled by a link protocol
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For other uses, see Data (disambiguation).


Debt, AIDS, Trade in Africa (or DATA) is a multinational non-government organization founded in January 2002 in London by U2's Bono along with Bobby Shriver and activists from the Jubilee 2000 Drop
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In telecommunications, transmission is the forwarding of signal traffic over distances that are too great to be simply connected by a twisted pair wires. Techniques available now may be microwave link, satellite link, coaxial cable or fibre optic cable.
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Electrical impedance, or simply impedance, describes a measure of opposition to a sinusoidal alternating current (AC). Electrical impedance extends the concept of resistance to AC circuits, describing not only the relative magnitudes of the voltage and current, but also the
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An electronic circuit is an electrical circuit that also contains active electronic devices such as transistors or vacuum tubes. They can display highly complex behaviors, even though they are governed by the same laws as simple electrical circuits.
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In telecommunications an end instrument is a technical term for the piece of equipment connected to the wires at the end of a telecommunications link. In most cases, this is a telephone.
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Federal Standard 1037C, entitled Telecommunications: Glossary of Telecommunication Terms is a United States Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended.
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MIL-STD-188 is a series of U.S. military standards relating to telecommunications.

Purpose

Faced with “past technical deficiencies in telecommunications systems and equipment and software…that were traced to basic inadequacies in the application of
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A work of the United States government, as defined by United States copyright law, is "a work prepared by an officer or employee of the U.S. government as part of that person's official duties.
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Disconnect Supervision is a term in telephony, describing a situation whereby the called party indicates to the telephone exchange that the call is being disconnected by the called party by allowing loop current to flow in the line.
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