Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request
From: motcid!segal%cell.mot.COM@uunet.uu.net (Gary Segal)
Newsgroups: comp.dcom.telecom
Subject: Re: How Were Telephone Sounds Chosen?
Message-ID: <2060@accuvax.nwu.edu>
Date: 11 Dec 89 18:54:51 GMT
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martin@cod.nosc.mil (Douglas W. Martin) writes:

>     Also, can anyone supply information about the frequency,
>duration, etc. for the off-hook alarm signal?

The off-hook warble tone comes on after about 18 seconds.  It is a
composite of a 1400Hz tone and a 2060Hz tone at about -12dBm.  It is
on for 0.1 second and then off of 0.1 second.

While I'm at it...

Ringback is 440Hz & 480Hz, 2.0 seconds on, 4.0 seconds off, -12dBm.
Busy is 480HZ & 620Hz, 0.5 sec on, 0.5 sec off, -12dBm.
Reoder is busy twice as fast (0.25 on, 0.25 off).

Off course, the above is only sometimes true, and only then in the
USA.


Gary Segal, Motorola C.I.D.			1501 W. Shure Drive
 ...!uunet!motcid!segal				Arlington Heights, IL 60004
Disclaimer: The above is all my fault.		+1 708 632-2354