Science Fair Project Encyclopedia
Busy verification
Busy verification: In a public switched telephone network, a network-provided service feature that permits an attendant to verify the busy or idle state of station lines and to break into the conversation.
A 440 Hz tone is applied to the line for 2 seconds, followed by a 0.5 second burst every 10 seconds, to alert both parties that the attendant is connected to the circuit.
Last updated: 10-11-2005 05:43:02
10-26-2009 08:16:03
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details