Re: [hylafax-users] MODEM Command Error

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

George H wrote:

> May 07 12:34:41.21: [31707]: RECV training at v.29 9600 bit/s
> May 07 12:34:41.21: [31707]: MODEM set XON/XOFF/DRAIN: input ignored,
> output generated
> May 07 12:34:41.21: [31707]: <-- [10:AT+FRM=96\r]
> May 07 12:34:41.79: [31707]: --> [7:CONNECT]
> May 07 12:34:46.30: [31707]: MODEM TIMEOUT: receiving TCF
> May 07 12:34:46.30: [31707]: <-- data [1]
> May 07 12:34:46.37: [31707]: --> [2:]
> May 07 12:34:46.37: [31707]: --> [2:OK]
> May 07 12:34:46.37: [31707]: MODEM set XON/XOFF/DRAIN: input ignored,
> output disabled
> May 07 12:34:46.37: [31707]: <-- [9:AT+FRS=7\r]
> May 07 12:35:04.31: [31707]: --> [10:NO CARRIER]


Well, let me explain what that says.

It says that after receiving DCS (indicating an intent to use V.29 9600 
bps) we then started listening for V.29 9600 bps carrier and heard it 
and trained with it at 12:34:41.79.  If we are to trust the modem then 
the sender did not drop the carrier for at least 4.5 seconds (TCF 
training is only supposed to be 1.5 seconds long).  HylaFAX told the 
modem to abort TCF reception and to then await the carrier drop 
(AT+FRS=7).  That carrier drop was finally detected at 12:35:04.31, 22 
seconds later, at which point the modem was then on-hook.

As it's an analogue modem I suspect that this represents an error with 
the modem itself.  I would counsel you the same way as I've been 
counselling USR users for a while now... avoid using +FRS entirely (your 
session has it used twice).  Please make sure that you have this in your 
modem config file:

#
# When using AT+FRS=n we see USR modems reset themselves in the middle 
of sessions
# this is not good.  So, we seem to work-around that problem by not 
using the
# command.  Unfortunately, this isn't an ideal thing.
#
Class1SwitchingCmd:     "<delay:7>"

Lee.

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