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.
  • One of two possible signaling states, such as tone or no tone and ground connection versus battery connection. Note that if off-hook pertains to one state, on-hook pertains to the other.
  • The active state (i.e., a closed loop (short circuit between the wires) of a subscriber line or PBX user loop)
  • An operating state of a communications link in which data transmission is enabled either for (a) voice or data communications or (b) network signaling.

    • On an ordinary two-wire telephone line, off-hook status is communicated to the telephone exchange by a resistance short across the pair. When an off-hook condition persists without dialing, for example because the handset has fallen off or the cable has been flooded, it is treated as a permanent loop or permanent signal.

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

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    This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Off-hook

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