Re: [hylafax-users] failed to receive all pages of multipage fax

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2004.07.22 10:40 George Bell wrote:
> Log follows for failed fax reception.
> Faxmodem: MT5634ZPX-PCI
> operating in Class 1 (not 1.0)
> Hylafax version 4.2.0beta1
>
> The sender was a Panasonic Fax Machine
>
> What could have caused the T.30 T2 timeout ?

> Jul 22 13:02:27.73: [ 2006]: <-- [9:AT+FTH=3\r]
> Jul 22 13:02:28.68: [ 2006]: --> [7:CONNECT]
> Jul 22 13:02:28.68: [ 2006]: RECV send MCF (message confirmation)
> Jul 22 13:02:28.69: [ 2006]: RECV FAX (000000182): from 6098835087,
> page 2 in
> 0:31, INF, 3.85 line/mm, 2-D MR, 14400 bit/s
> Jul 22 13:02:28.69: [ 2006]: <-- HDLC<3:FF C8 31>
> Jul 22 13:02:29.11: [ 2006]: --> [2:OK]
> Jul 22 13:02:29.12: [ 2006]: MODEM input buffering enabled
> Jul 22 13:02:29.12: [ 2006]: <-- [11:AT+FRM=146\r]
> Jul 22 13:02:30.70: [ 2006]: --> [7:CONNECT]
> Jul 22 13:02:30.70: [ 2006]: RECV: begin page
> Jul 22 13:02:38.05: [ 2006]: RECV: 175 total lines, 3 bad lines, 1
> consecutive
> bad lines

Notice that 175 lines is a VERY short page (at 98 lpi that's not quite 
2").  Your logging isn't turned up high enough for us to see which 
lines are actually corrupt, but I would suspect that at least the last 
line (#175) would be corrupt.

In this circumstance, I assume that some noise occurred on the line 
that made the modem sense a carrier drop.

> Jul 22 13:02:38.06: [ 2006]: RECV: end page
> Jul 22 13:02:38.06: [ 2006]: --> [10:NO CARRIER]

Indeed, the modem detected a carrier drop.  However, the sender is 
probably still sending image data...

> Jul 22 13:02:38.06: [ 2006]: <-- [9:AT+FRH=3\r]
> Jul 22 13:02:38.54: [ 2006]: --> [7:CONNECT]
> Jul 22 13:02:39.11: [ 2006]: --> [19:15 11 9A 1A D5 75 17 95 41 CA E4
> 96 AB 49
> 00 3F 14 10 03]
> Jul 22 13:02:39.11: [ 2006]: --> [5:ERROR]
> Jul 22 13:02:39.11: [ 2006]: MODEM Command error
> Jul 22 13:02:39.11: [ 2006]: FCS error

Yup.  Lots of this is going to happen until the sender stops sending 
page data.  Unfortunately, if it happens for too long, then we'll hang 
up (which is what happened in your case, but it also looked like the 
sender hung up, too).

In other words, there was some line problem, or more likely, some 
problem with the modulator on the sender or the demodulator on the 
receiver, and so we got disconnected.  If it is reproducible, then 
worry about it more.  Otherwise, ignore it if you can.

Lee.

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