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| - A station or trunk is 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 d
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| abstract
| - 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, and may initiate the process of clearing. See also disconnect supervision.
- A station or trunk is on-hook
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