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Re: Large number of errors with Hylafax and ZyXEL Omni modem
It's hard to make sense of the numbers below(at least for me), i've got a
small script "errorstats" which parses xferlog for errors grouping by type.
Download from http://www.trump.net.au/~rjc/hylafax/
For some numbers - we are using USR Couriers for sending and receiving.
>From the statistics gathered by my errorstats script no particular modem
error is occuring more than 20 times per thousand fax sent.
Transmit Phase B ~ 13/1000 (The modems are operating in Class 2.0)
Unknown Modem Problem ~ 17/1000
T1 Timeout ~ 6/1000
DCS Errors ~ 7/1000
EOP Errors ~4/1000
A number of other errors each less than 3 per 1000 fax sent
The negative retrain problem is occuring occasionally, it is worse than
other fax errors in that you always get a complaint from the other end
whereas with the other modems errors fail silently.
I've looked quickly into the source code and i think i can see where to
change the code to stop the retransmit _but_ i am not very keen to do this.
Firstly i am not sure this is the right thing to do and i dont currently
have a good test setup to check whether this is done correctly.
If i was in your situation i would 1) get some accurate data on how many
calls are failing and why 2) double check your configuration 3) get the
telephone company to check all your phone lines.
At 07:53 2/04/98 +0530, Shuvam Misra wrote:
>This is in continuation to earlier mails from myself and others on this
>topic. I'm running a TPC cell using Linux, Hylafax 4.0pl2, and a ZyXEL
>Omni O288S, as mentioned before. This is the statistical count of the
>Hylafax transfer figures for the last day:
> 52 0
> 39 2
> 6 3
> 13 4
> 1 5
> 1 6
> 2 7
> 1 9
> 1 10
> 1 11
> 1 12
> 1 13
> 1 14
>The first field is count or frequency, and the second is the number of
>people who sent a total number of pages as shown. So "52 0" means that
>52 people queued one or more jobs and could send only 0 pages. The
>second line is "39 2" which means that 39 people sent a total of 2 pages
>each. (This is the minimum length of most TPC jobs, because they have
>a cover page, and a short message page after that. This means that 39
>people sent one job each.) And so on.
>The total is 121 people, who have tried sending faxes out. Out of them
>52 people couldn't send out anything at all, as we can see. This is
>unacceptable by any standards, I would think. Harald Pollack has said that
>any public fax broadcaster will encounter about 40% failures. Another
>gentleman has been using Multitech modems and has reported 5 to 10%
>failures only. I am reporting about 45% faxes failed, which means perhaps
>60 to 80% of alls calls made, failing. (This is because each fax fails
>only after it has made several attempts to go through.)
>Another figure shows that 242 pages were transmitted successfully,
>but 313 error-calls were recorded. These errors exclude the ones where
>carrier couldn't be established. This means that each of these 313 calls
>were completed at the Telco level, and so will be billed to me. Is this
>typical? I am sure all TPC operators who use Hylafax will be getting
>their daily report from "faxcron". Can they send me a five line email
>just cutting out the day's "Total" line from yesterday's report, together
>with a line giving which area they operate in?
>Most of us run TPC as a voluntary service. We need to cut wasteful
>expenditure. We use Hylafax, and we need the Hylafax community to
>come together to figure out whether there is indeed any problem in
>the software which might be increasing errors, as Harald's and others'
>mails have hinted. I have not seen much discussion on the Hylafax
>mailing lists about these fundamental aspects of its behaviour; most of
>the discussion revolves around new setup problems, cover pages, and the
>like, which are important but are not of use in this specific case.
>Is Sam Leffler still active on this list or with this software? Is Matt
>Apitz or David Woolley or anyone else in a position to take up these
>issues and bring down the errors, specially with ZyXEL modems? One set
>of ZyXEL users who don't use Hylafax, swear by its fax implementation.
>Should all Hylafax users then switch out of ZyXEL to Multitech? Or
>should all TPC operators switch out of Hylafax?
>Hoping for more responses on this list,