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TAP_and_YIPL_Collection_CD.iso
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SPECIALX.TON
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1992-02-29
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21 lines
Date: Friday, 18 October 1985 22:20-MDT
From: covert%castor.DEC at decwrl.DEC.COM (John Covert)
To: TELECOM at MIT-MC
Re: S.I.T.s (Special Information Tones)
The first two tones can vary, but the last tone is always the same.
This provides a binary encoding indicating four different meanings.
Tone 1 Tone 2 Tone 3
Low: 913.8 Hz 1370.6 Hz
High: 985.2 Hz 1428.5 Hz 1776.7 Hz
Low tone is always 274 ms, High is 380 ms
Category: Reorder Low High
Vacant Code High Low
No Circuits High High
Intercept Low Low
/john