Re: 1D/2D

[Steve Williams <steve@genie96.com>]

> 
> > And the failures, rather systematically, look like:
> > 
> > 101462.331@some.com                0     0:00    0.0    2    2400 2-D MMR
> > A.Deans@some.ac.uk                 0     0:00    0.0    3    2400 2-D MMR
> > C.L.Nicholls@some.ac.uk            0     0:00    0.0    1    2400 2-D MMR
> > 
> > Is this a known issue with the MultiModems, or should I be digging deeper?
> 
> These look like you aren't getting a connection at all.  You might check the
> log directory for the phone numbers in question to see what really
> happened.  Several months back someone posted some modem init commands
> that were supposed to help with Multitech reliability but I seem to
> have lost it.  Does anyone know where it might be in the archives?
> 
> Les Mikesell
>   les@mcs.com

Here is the post that I think you are referring to....however, it only
mentions receiving, not sending.  From the tone of the post, it would
appear that Multitech is quite cooperative.  If TPC.INT has enough 
faxes failing consistently, you should have a bunch of log files to 
give them, once you find the right person to give them to.

As an aside, I have put in the "patch" mentioned below, though our ZDX
is send only.   I have no problems with the ZDX, but in checking my Logs, very
few of my faxes actually go out 2D encoded.

Not sure what is going on.

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>  Sender: owner-flexfax@celestial.com
>  Date: Wed, 18 Sep 96 14:11:03 EDT
>  Message-Id: <9609181811.AA04503@aoi.ultranet.com>
>  From: Glenn Burkhardt <glenn@aoi.ultranet.com>
>  To: flexfax@sgi.com
>  Subject: MultiTech ZDX2834 modems
>  Sender: owner-flexfax@celestial.com
>  Precedence: bulk
>  Status: RO
>  
>  I've been working with MultiTech support, and we've found out how to
>  improve the ZDX 2834's ability to receive faxes.  The receive threshold
>  in negative decibels is determined by the S38 register.  Its factory
>  default value is 43; changing it to 35 makes it possible to receive
>  faxes from our AT&T 3510D fax machine (and probably many others).  
>  
>  The command "ATS38=35" will change the value of the S register.
>  The command "AT&F9" will prevent the factory default value from being
>  loaded should the command "AT&F" be issued.  So, recommend this
>  one-time, out of the box, initialization for the modem:
>  
>  AT&F
>  ATS38=35
>  AT&F9
>  AT&W0
>  
>  The explanation they had was that when carrier was dropped as part of the
>  normal facsimile handshaking, noise on the line was above the receive
>  threshold level, making the modem think that carrier hadn't be dropped.
>  Eventually, the T2 timer expired, and the modem reported "+FHNG:73"
>  (T.30 T2 timeout, expected page not received (code 73) ).  Increasing
>  the modem's receive threshold to -35db keeps the noise level below the 
>  carrier, at least for my fax machine and phone lines
>  
>  I earlier reported seeing 
>  
>  	"REMOTE HANGUP: Unspecified Transmit Phase B error code 20)"
>  
>  errors during fax transmissions with the ZDX.  These were in fact due to
>  the phone number being incorrect (the 0 in the 011 international access
>  code had been omitted due to a typo in the config file).
>  
>  I currently know of no fax transmission failures with the ZDX2834 modem.
>  
>  MultiTech Support (800 972 2439) also invited anyone who's having
>  trouble to call them.
>  
>  

-- 
 	Steve Williams, Calgary, Alberta, Canada
 	Genie Computer Systems Inc.
 	steve@genie96.com