Re: [hylafax-users] It was a good try at Open Source....

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2004.03.08 11:21 Frank Griffith wrote:
> Not to sound ungrateful, but if you solved the issue for me twice it
> went right over my head both times.

I didn't say I solved it.  I said I explained it and gave you advice.

> "But, they hang up. Guess they didn't want to really send you this
> fax."
>
> I'm trying to figure out how that solved my problem....

It wasn't supposed to solve anything.  It was meant to explain the 
corrupt page.  You never continued the threads long enough or provided 
us with enough useful debugging information to let us help you solve 
it.  If you receive a page of corrupt TIFF and request retransmission 
and then the sender chooses to hang up then the last page will be 
corrupt.  If faxing between two stations regularly ends up with a 
corrupt page, but between other stations there is no problem, then 
there's likely a problem with the modulator on the HylaFAX modem or 
with the modulator on the remote station, or there's something 
seriously wrong with connectivity (noise, static).

To test, you swap hardware with a different make and model.  If the 
error persists then the problem probably has to do with connectivity.  
If it doesn't, then you blame it on a flaky modem.  Almost all USRs are 
flaky in one way or another.  Swapping a USR with a USR isn't debugging.

> I then went to the front office and from another fax machine (in the
> same area code) sent this server 2, 3, and 10 page faxes without a
> hitch. The next morning they tried again from the out of town offices
> and we got garbage again. So we had them send it to the fax machine in
> our receiptionist office and had no problems, no matter how many pages
> or how many times they resend.

Most fax machines support ECM.  HylaFAX 4.1.8 and earlier does not 
support ECM in Class 1 and then only in Class 2 if the modem supports 
it internally.  HylaFAX CVS HEAD does support ECM in Class 1.  So you 
could have used CVS to have seen the real crutch of the matter as far 
as corrupt data went.

> In another reply you said to swap out the modem. The modem works fine
> because it does all the other tasks we ask of it.

Your logic here is not sound.  I can have a car that drives well in all 
gears but 5th, but when used in 5th gear it fails.  Is my car still 
considered to be working fine?  You have a modem that works well with 
all senders except the one you had problems with.

> I tested it
> thoroughly, but knowing it could be anything, I did swap out the
> modem. Same results. I thought it could be something like noisy phone
> lines so we swapped those out too. Same results.

So why didn't you reply after doing this saying that it did not help?

> We brought in a standard $100 fax machine and put it on the same phone
> line and it works everytime. This is what they meant by "we told you
> so!" and what I meant by saying the issue was never resolved.

Again, most fax machines support ECM, so the fax reception is done in a 
completely different way.  It's like comparing a photocopier to a 
scanner - they are similar, but they don't work the same.

Lee.

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