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1. In telephony, the condition that exists when an operational telephone, or other user instrument, is not in use.
Note: On-hook originally referred to the storage of an idle telephone receiver, i.e., separate earpiece, on a hook that extended from a vertical post that supported the microphone also. The hook was mechanically connected to a switch that automatically disconnected the idle telephone from the network.
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. , open loop, of a subscriber or PBX user loop.
4. An operating state of a communicationsThe term communications is used in a number of disciplines: communications also known as communication studies is the academic discipline which studies communication. In geography, communications are the physical routes ( roads, rivers, canals, railways, 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 data transmissionData transmission is, very generally speaking, the conscious act of moving any kind of information from one space to another. Historically this could be done by courier, a chain of bonfires or semaphores, and later by Morse code over copper wires. In rece is disabled and a high- impedanceIn electrical engineering, impedance is a measure for the manner and degree a component resists the flow of electrical current if a given voltage is applied. It is denoted by the symbol Z and is measured in ohms. Impedance differs from simple resistance i, i.e., open circuitThere are many kinds of circuit An electric circuit interconnects electrical elements. Examples in electronics include printed circuits integrated circuits digital circuits Series and parallel circuits Telecommunication circuits A sport circuit is a close, is presented to the 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. by the end instrumentIn 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. telephony telecommunications.(s).
Note: During the on-hook condition, the link is responsive to ringing signals.
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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