Specifications

HYLAFAX-CONFIG(5F) HYLAFAX-CONFIG(5F)
and the subsequent retransmisisons than it is to allowthe communication speed to slowdown
(where the demodulation may still not produce an ideal data stream, anyway).
Class1TCFRecvHackCmd
If receive failures occur due to +FCERROR just prior to TCF data reception, setting
Class1TCFRecvHackCmd to AT+FRS=1 may help.
Class1TCFRecvTimeout
The maximum time to wait, in milliseconds, for the first byte and again for the entirety of the
Training Check (TCF)message data that is receivedduring the training phase of the facsimile
reception protocol.
Class1TMConnectDelay
The time, in milliseconds, to delay after receiving CONNECT following +FTM before sending
image data. T.31 8.3.3 requires the modem to respond with CONNECT before the modulation
training pattern. If transmission begins before the remote has successfully completed its own
modulation training pattern then data, especially during TCF,could be lost. Manymodems do not
followT.31 in this regard, and thus the default is zero; howeverits use with such modems would
likely have a negligible effect.
Class1ValidateV21Frames
Whether or not to use the FCS bits of receivedV.21 HDLC frames to check the validity of the
frame itself. Most Class 1 modems perform this check independently (per T.31 7.4) and do not
require this feature to be enabled.
CLASS 2 AND 2.0 MODEM CONFIGURATION PARAMETERS
The following parameters are specific to the configuration of Class 2- and Class 2.0-style modems:
Class2Cmd
The command to set the modem into Class 2/2.0 operation.
Class2AbortCmd
The command to use to abort an established session. After using this command to abort a session,
the fax software will send ModemOnHookCmd and then reset the modem by dropping DTR .
Class2APCmd
Alargely unused option for modems supporting ITU-T.32, Class 2.1, standards. This command
would be used to enable sending and receiving SUB, SEP,and PWD frames.
Class2APQueryCmd
Alargely unused option for modems supporting ITU-T.32, Class 2.1, standards. This command
would be used to query the capabilities of sending and receiving SUB, SEP,and PWD frames.
The value ‘‘none’’may be used if the modem does not support any Class2APQueryCmd.
Class2BORCmd
The command to setup the bit order of sent and receivedfacsimile data. Usually the command
‘‘AT+FBOR=0’’ isused so that data is sent and receivedin direct bit order (LSB2MSB). Some
modems, such as the Everex24/96D, must use reversed bit order for Phase B and D data
exchanges to avoid a bug that results in garbage data being placed in the padding of EOL codes.
The bit order specified by this command must correspond to the settings of the ModemSendFil-
lOrder and ModemRecvFillOrder parameters.
Class2BUGCmd
The command to use to enable or disable the tracing of HDLC frames sent and receivedbythe
modem. This tracing information should be returned to the host in ‘‘+FHR:’’ and ‘‘+FHT:’’ status
strings. Note that manyClass 2 modems do not support this facility,which is largely used for
diagnostic purposes. The value ‘‘none’’may be used if the modem does not support any
Class2BUGCmd.
Class2CIGCmd
The command used to set a polling identifier.This string is inserted into the format ‘‘%s="<id>"’’.
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