Gestetner B147, Service Manual

Page: 845 / 1081

BIT SWITCHES
SM 51 B603
Fax Op
tion
B60
3
Communication Switch 01 SP No. 1-104-002
No FUNCTION COMMENTS
0 ECM
0: Off 1: On
If this bit is set to 0, ECM is switched off for all
communications.
In addition, V.8 protocol and JBIG compression are
switched off automatically.
1 Not used Do not change the setting.
2
to
3
Wrong connection prevention
method
Bit 3 Bit 2 Setting
0 0 None
0 1 8 digit CSI
1 0 4 digit CSI
1 1 CSI/RTI
(0,1) - The machine will disconnect the line without
sending a fax message, if the last 8 digits of the
received CSI do not match the last 8 digits of the
dialed telephone number. This does not work when
manually dialed.
(1,0) - The same as above, except that only the last
4 digits are compared.
(1,1) - The machine will disconnect the line without
sending a fax message, if the other end does not
identify itself with an RTI or CSI.
(0,0) - Nothing is checked; transmission will always
go ahead.
Note: This function does not work when dialing is
done from the external telephone.
4-5 Not used Do not change the settings.
6
to
7
Maximum printable page length
available
Bit 7 6 Setting
0 0 No limit
0 1 B4 (364 mm)
1 0 A4 (297 mm)
1 1 Not used
The setting determined by these bits is informed to
the transmitting terminal in the pre-message
protocol exchange (in the DIS/NSF frames).
Communication Switch 02 SP No. 1-104-003
No FUNCTION COMMENTS
0 Burst error threshold
0: Low 1: High
If there are more consecutive error lines in the
received page than the threshold, the machine will
send a negative response.
The Low and High threshold values depend on the
sub-scan resolution, and are as follows.
Resolution 100 dpi 200 dpi 400 dpi
3.85 l/mm 7.7 l/mm 15.4 l/mm
Low settings 6 12 24
High settings 12 24 48
1 Acceptable total error line ratio
0: 5% 1: 10%
If the error line ratio for a page exceeds the
acceptable ratio, RTN will be sent to the other end.
2 Treatment of pages received
with errors during G3 reception
0: Deleted from memory
without printing
1: Printed
0: Pages received with errors are not printed.