[hylafax-users] Re: Bad code word at scanline with Zylex U1496E

[Dmitry Bely <dbely@mail.ru>]

___cliff rayman___ <cliff@genwax.com> writes:

> i am getting this Bad code word at scanline problem on about 10% of my
> received faxes..
> we are using: MODEM ZYXEL U1496E/V 6.19 P
> 
> has anyone else gotten this modem to work with consistent results?

Yes, works great for me.

> if not, is there any consensus on a modem that does work well for both
> sending and receiving?
> 
> below is my current config.  i have toggled the ECM line (last line).

ECM is *not* implemented in this modem (despite +FCC responce), so better
disable it again ASAP.

> tried 38400 and 19200.  and also tried the class2.0 interface.  i still
> get the bad code word error message on about 10% of my faxes.:
> CountryCode:            1
> AreaCode:               818
> FAXNumber:              1.818.764.3878
> LongDistancePrefix:     1
> InternationalPrefix:    011
> DialStringRules:        etc/dialrules
> ServerTracing:          1
> SessionTracing:         11
> RecvFileMode:           0644
> LogFileMode:            0644
> DeviceMode:             0600
> RingsBeforeAnswer:      1
> #SpeakerVolume:         medium
> SpeakerVolume:          low
> GettyArgs:              "-h %l %s"
> LocalIdentifier:        GENWAX
> TagLineFont:            etc/lutRS18.pcf
> TagLineFormat:          "From %%l|%c|Page %%p of %%t"
> NoCarrierRetrys:        3
> MaxRecvPages:           25
> ModemType:              Class2          # use class 2 interface
> ModemRate:              19200           # 38.4 works fine
> ModemFlowControl:       rtscts          # default
> ModemNoFlowCmd:         AT&H0           # disable flow control
> ModemHardFlowCmd:       AT&H3           # hardware flow control
> ModemSoftFlowCmd:       AT&H4           # software flow control
> ModemSetupDTRCmd:       AT&D2           # DTR off causes modem to hang
> up
> ModemSetupDCDCmd:       AT&C1           # DCD tracks carrier
> ModemSetupAACmd:        AT+FAA=1        # enable in current class
> ModemSendFillOrder:     LSB2MSB         # as expected
> ModemRecvFillOrder:     MSB2LSB         # opposite of what makes sense
> Class2RecvDataTrigger:  "\022"          # a la 2388-B
> ModemResetCmds:         AT&B1&N0&S0*F0S18=3S38.3=1S39=0

Useless stuff. Use

ModemResetCmds:         ATZS38.3=1

instead.

> ModemDialCmd:           ATDT%s          # no '@' 'cuz then busy not
> recognized
> NoCarrierRetrys:        3               # retry 3 times on no carrier
> ModemSetVolumeCmd:      "ATM0 ATM1L1 ATM1L3 ATM1L5 ATM1L7"
> PagerSetupCmds:         AT&K0&N15       # use V.22 at 1200 bps (PageNet)
> 
> #Class2DCCQueryCmd:     "!(0,1),(0-5),(0-4),(0-2),(0,1),(0),(0),(0-7)"
> 
> example error message:
> Fax3Decode2D: recvq/fax15356.tif: Bad code word at scanline 133 (x
> 1728).
> Fax3Decode2D: recvq/fax15356.tif: Bad code word at scanline 135 (x
> 1728).
> Fax3Decode2D: recvq/fax15356.tif: Bad code word at scanline 222 (x
> 1728).
> Fax3Decode2D: recvq/fax15356.tif: Bad code word at scanline 223 (x
> 1728).
> Fax3Decode2D: recvq/fax15356.tif: Uncompressed data (not supported) at
> scanline 224 (x 349).
> Fax3Decode2D: recvq/fax15356.tif: Bad code word at scanline 226 (x
> 1438).
> --snip 30 lines
> Fax3Decode2D: recvq/fax15356.tif: Uncompressed data (not supported) at
> scanline 776 (x 650).
> Fax3Decode2D: recvq/fax15356.tif: Bad code word at scanline 777 (x
> 1728).

Fax transmission is not reliable, and errors sometimes happen. The quality
checking is not enabled in your config, so Hylafax just stores received
data "as is" with errors. I recommend you the following (will likely be
included into the new Hylafax beta):

[---cut---]
#
# ECM is not implemented in U1496 despite AT+FCC=? says
#
Class2DCCQueryCmd:	"!(0,1),(0-5),(0-4),(0-2),(0,1),(0),(0),(0-7)"
#                                                          
# Quality Checking is not implemented in U1496 despite AT+FCQ=? says
#                                                          
Class2CQQueryCmd:       "!(0),(0)"
#
# Disable unnecessary, not implemented and possibly dangerous commands
#
Class2BORCmd:           "AT"
Class2PIECmd:           "AT"                               
Class2PHCTOCmd:         "AT"                               
Class2TBCCmd:           "AT"                               
[---cut---]

Also note what with current Hylafax you will suffer from "endless RTN" bug, 
but it's quite another story :-)

Hope to hear from you soon,
Dmitry




____________________ HylaFAX(tm) Users Mailing List _______________________
 To unsub: mail -s unsubscribe hylafax-users-request@hylafax.org < /dev/null