Re: [hylafax-users] Sedlbauer ISDN card

[Lee Howard <faxguy@deanox.com>]

At 07:04 PM 8/16/01 +0200, Moritz Both wrote:
>
>Lee Howard <faxguy@deanox.com> wrote on Donnerstag, 16. August 2001:
>
>> [...]
>>>Aug 16 17:51:39.78: [ 5012]: DELAY 150 ms
>>>Aug 16 17:51:39.93: [ 5012]: <-- [9:AT+FTH=3\r]
>>>Aug 16 17:51:39.93: [ 5012]: --> [10:NO CARRIER]
>
>> Now we're not connected.  My guess would be that the remote didn't like our
>> 150 ms delay.  Try setting Class1SwitchingDelay to lesser settings (75, 0),
>> restart faxgetty, and then try again.  If this turns out to be the case,
>> please report what the greatest value was that functioned for you.
>
>Indeed, this works. I have made a binary search for the maximum
>possible value and here it is: 84. Also 0 works. What is the reason to
>do this delay anyway?

Good, it seems that the default delay needs to be changed to 75 ms.

In T.31 a delay is recommended between "switching carrier direction of
transmission", but it doesn't specify a length for the delay.  So I came up
with 150 ms by testing between two HylaFAX systems.  Yours is the first
report of the default Class1SwitchingDelay being too long, but I had
suspected that it was already.

Thanks.

Lee.



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