Manufacturer: Multi-Tech Systems Model: MT2834ZDX Model: MT2834ZDXF (version for French market) Model: MT2834ZDXG (version for German market) Model: MT2834ZDXK (version for UK market) Last Updated: Date: 1997/10/15 04:02:00 $
October, 1997
This modem is recommended for use with HylaFAX.
It has been mentioned, however, that the AT command &D3 is broken. The
workround is to use &C4 in place of &C1.
Glenn Burkhardt, with help from
Multitech support, passed on the following advice 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 351D fax machine (and
probably many others)>
The command ATS38=35 will change the value of the S38 register.
To prevent the factory default value from being loaded should a AT&F
command be issued, the command AT&F9 is needed.
The following, one-time, out of the box, initialization for the modem is
therefore recommended :
AT&F
AT&S38=35
AT&F9
AT&W0
The explanation they had was that when the carrier was dropped as part of
the normal facisimile handshaking, noise on the line was above the receive
threshold level, making the modem think that the carrier had not been
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.