Re: [hylafax-users] [hylafax-devel] Re: Re: Distinctive ring & cid

[Lee Howard <faxguy@deanox.com>]

At 08:13 PM 6/21/01 -0400, Jay R. Ashworth wrote:
>On Thu, Jun 21, 2001 at 08:03:12PM -0400, Jay R. Ashworth wrote:
>> Fact: TR-TSY-000030 *requires* that that the CNID burst be sent
>> *between* the first and second rings sent to the station.
>> 
>> It can't ever be sent before the first ring, because most boxes sleep
>> until they hear ring signal.
>> 
>> It can't be sent later because people won't wait.
>
>And I apologize; I meant to add that it can't be sent *during* the ring
>because it would be way too expensive to design circuitry to extract
>the 1V P-P 201 modem signal off the edge of the 90VAC ring signal.

The CID man page update reads the way it does rather than specifying that
CNID data comes between rings 1 and 2 because CNID delivery timing is
different on ISDN, or so I gather.  But, we're talking analog here, so...

Lee.



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