Compaq W25 - Manual (Page 13)

2/221 02-FGB 101 327 Uen B – November 2007 13
Parameter Description
jbig JBIG should be used, (reduces bandwidth).
(True|False)
Ecm Specifies if ECM should be used or not.
(True|False)
extended_
roundtrip Enables the support of dealing with extended
round trip delays (True|False)
data_wait_time This parameter indicates the time for internal
buffering appropriate V.21, ECM and non-ECM
page data in the case if the end of line or the end
of the HDLC frame is not detected. The value
range is from 0 up to 100. The default value is to
set to 50 which is of 500 ms buffering. One unit is
of 10 ms. After the Data Wait Time T.38 starts with
the modulation also if not all data is received
low_rate_
recovery_
packets This parameter is used for the Redundancy and
the FEC error Correction Mode on a UDP
transmission for V.21. The parameter indicates the
number of additional recovery data packets send
during a low rate Fax transmission (control data).
The value can be between 0 and 4.
high_rate_
recovery_
packets This parameter is used for the Redundancy and
the FEC error Correction Mode on a UDP
transmission for V.17, V.29, and V.27. The
parameter indicates the number of additional
recovery data packets send during a high rate Fax
transmission (image data). The value can be
between 0 and 4.
To show the current configuration for T.38, use the following command:
cf show ims.media.codec.t38
ims.media.codec.t38.forward_error_correction false
.max_bit_rate 14400
.local_tcf false
.fill_bit_removal false
.transcoding_mmr false
.transcoding_jbig false
.ecm true
.extended_roundtrip false
.data_wait_time 500
.low_rate_recovery_packets 4
.high_rate_recovery_packets 1
Depending on radio network characteristics, there might be a need for fine
tuning T.38.
ECM (Error Correction Mode) may need to be reconfigured since ECM is
sensitive for packet loss, it might be necessary to disable this.