ATIS Telecom Glossary
Wednesday, October 01, 2014

A B C D E F G H I
J K L M N O P Q R
S T U V W X Y Z  
Go
 
Glossary Home
Foreword
Introduction
Normative References
Using the ATIS Telecom Glossary
Annex A: Informative References
 
 
 
<< Back
on-hook
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 communications link in which data transmission is disabled and a high-impedance, i.e., 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. See on-hook state.

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
For more information on the work related to these definitions,
please visit the ATIS website and the ATIS Document Center