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Tilghman Lesher wrote:
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cite="mid200805271736.37552.tilghman@mail.jeffandtilghman.com"
type="cite">
<pre wrap="">On Tuesday 27 May 2008 17:17:41 John Novack wrote:
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<pre wrap="">Jared Smith wrote:
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<pre wrap="">On Tue, 2008-05-27 at 16:42 -0400, Dean Collins wrote:
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<pre wrap="">How do you get asterisk to send a 102 Milliwatt signal?
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<pre wrap="">The Milliwatt() dialplan application sends a 1000 Hz tone. (I'm still
waiting for the developers to agree that it should be 1004 Hz, but
that's another issue.)
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<pre wrap="">1004Hz has been the Telco standard for many a year.
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<pre wrap=""><!---->
You can already do that with simple dialplan:
exten => 8114,1,Answer
exten => 8114,n,PlayTones(1004/1000)
exten => 8114,n,Wait(300)
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<pre wrap="">Just another example of why the developers need to go to a basic Telco
school before reinventing the wheel ( sometimes incorrectly )
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<pre wrap=""><!---->
There is no need to insult the developers. Yes, there's a reason why the
typical milliwatt application is not exactly 1000Hz. I think we've actually
left the Milliwatt application the way that it is for historical reasons,
ironically enough.
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The sampling rate on a T1 for a DS0 is 8kHz and 1kHz is a harmonic of
8kHz and harmonic distortion can cause significant measurement errors.
So early on engineers tuned the test frequency to be slightly off to
keep harmonic distortion to a minimum when taking loss measurements.<br>
<br>
Lyle Giese<br>
<br>
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