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1. In telephony, the condition that exists when an operational telephone instrument or other user instrument is in use, i.e., during dialing or communicating.
Note: Off-hook originally referred to the condition that prevailed when the separate earpiece, i.e., receiver, was removed from its switchhook, which extended from a vertical post that also supported the microphone, and which connected the instrument to the line when not depressed by the weight of the receiver.
2. One of two possible signaling states, such as tone or no tone and ground connection versus battery connection.
Note: If off-hook pertains to one state, on-hook pertains to the other.
3. The active state, i.e. , closed loop, of a subscriber or PBX user loop.
4. An operating state of a communications linkThe term link can refer to: One element of a chain. one conection betwen 2 objects. one new name used instead of the original name of a file. customary unit of length equal to one hundredth of a chain. A connection between two components of a network. in which dataA datum is a statement accepted at face value (a "given"). Data is the plural of datum''. A large class of practically important statements are measurements or observations of a variable. Such statements may comprise numbers, words, or images. Etymology T transmissionIn communications, transmission is the act of transmitting electrical messages (and the associated phenonomena of radiant energy that pass through media). In telecommunication, the term transmission has the following meanings: 1. The dispatching, for rece is enabled either for (a) voice or dataA datum is a statement accepted at face value (a "given"). Data is the plural of datum''. A large class of practically important statements are measurements or observations of a variable. Such statements may comprise numbers, words, or images. Etymology T communications or (b) networkA wide variety of systems of interconnected components are called networks . Specific examples include: television networks transport networks, roads, railroads, shipping routes and airlines, pipelines (gas, petroleum, water, sewage), electric circuits a signaling.
Source: from Federal Standard 1037CFederal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. This docu and from MIL-STD-188MIL-STD-188 is a series of U. military standards relating to telecommunications. Documents 100 Common Long Haul and Tactical Communication System Technical Standards. 105 Interoperability and Performance Standards for the All Digital Tactical-To-Strategic
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