Re: [hylafax-users] T.30 Error

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2004.07.27 01:27 hylafax-users-bounce@xxxxxxxxxxx wrote:
> Hi all,
> I will appreciate if someone can give me an advice for a little
> problem
> I had.
> Sometimes, receiving multi-page faxes, I get no answer to the AT+FRM
> command after MCF.

What kind of modem are you using?

>   Jul 27 04:00:37.89: [ 8299]: RECV: begin page
>   Jul 27 04:01:00.45: [ 8299]: RECV: 2371 total lines, 0 bad lines, 0
> consecutive bad lines
>   Jul 27 04:01:00.45: [ 8299]: RECV: end page
>   Jul 27 04:01:00.45: [ 8299]: --> [10:NO CARRIER]
>   Jul 27 04:01:00.45: [ 8299]: <-- [9:AT+FRH=3\r]
>   Jul 27 04:01:00.61: [ 8299]: --> [7:CONNECT]
>   Jul 27 04:01:01.74: [ 8299]: --> [2:OK]
>   Jul 27 04:01:01.74: [ 8299]: RECV recv MPS (more pages, same
> document)
>   Jul 27 04:01:01.74: [ 8299]: DELAY 150 ms

This 150 ms delay is 55 ms longer than T.30 allows.  Why have you made 
it so long?

>   Jul 27 04:01:01.89: [ 8299]: <-- [9:AT+FTH=3\r]
>   Jul 27 04:01:02.02: [ 8299]: --> [7:CONNECT]
>   Jul 27 04:01:02.02: [ 8299]: RECV send MCF (message confirmation)
>   Jul 27 04:01:02.02: [ 8299]: RECV FAX (00000440): from xxxxxx, page
> 1
> in 0:26, INF, 7.7 line/mm, 2-D MR, 14400 bit/s
>   Jul 27 04:01:02.02: [ 8299]: <-- data [3]
>   Jul 27 04:01:02.02: [ 8299]: <-- data [2]
>   Jul 27 04:01:03.21: [ 8299]: --> [2:OK]
>   Jul 27 04:01:03.21: [ 8299]: <-- [11:AT+FRM=146\r]
> * Jul 27 04:01:10.21: [ 8299]: <-- data [1]
> * Jul 27 04:01:10.24: [ 8299]: --> [2:OK]
>   Jul 27 04:01:10.24: [ 8299]: RECV keeping unconfirmed page

The modem is *supposed* to respond with CONNECT, ERROR, or +FCERROR 
before 7 seconds elapse.  However, it (like many, many other modems) 
doesn't always do this it seems, and this is usually because either 1) 
there is no carrier at all, e.g., the sender hung up, or 2) the sender 
already has raised the high-speed data carrier, and the requisite 
carrier flags are missed.

In this case I'd first suspect that the remote has hung up due to the 
150 ms delay being longer than allowed.

Lee.

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