Ricoh B264 Service Manual page 823

G3 Switch 07
No FUNCTION
2 PSTN cable equalizer
to (rx mode: Internal)
3 Bit 3 Bit 2 Setting
0 0 None
0 1 Low
1 0 Medium
1 1 High
4 PSTN cable equalizer
(V.8/V.17 rx mode: External)
0: Disabled
1: Enabled
5-7 Not used
G3 Switch 08 - Not used (do not change the settings)
G3 Switch 09 - Not used (do not change the settings)
G3 Switch 0A
No FUNCTION
1 Maximum allowable carrier
drop during image data
reception
Bit 1 Bit 0 Value (ms)
0 0 200
0 1 400
1 0 800
1 1 Not used
2 Select cancellation of high-
speed RX if carrier signal lost
while receiving
0: Off
1: On
3 Not used
4 Maximum allowable frame
interval during image data
reception.
0: 5 s 1: 13 s
5 Not used
SM
COMMENTS
Use a higher setting if there is signal loss at higher
frequencies because of the length of wire between
the modem and the telephone exchange.
Also, try using the cable equalizer if one or more of
the following symptoms occurs.
•
Communication error with error codes such as
0-20, 0-23, etc.
•
Modem rate fallback occurs frequently.
Note: This setting is not effective in V.34
communications.
Keep this bit at "1".
Do not change the settings.
COMMENTS
These bits set the acceptable modem carrier drop
time.
Try using a longer setting if error code 0-22 is
frequent.
This switch setting determines if high-speed
receiving ends if the carrier signal is lost when
receiving during non-ECM mode
Do not change the settings
This bit set the maximum interval between EOL
(end-of-line) signals and the maximum interval
between ECM frames from the other end.
Try using a longer setting if error code 0-21 is
frequent.
Do not change the settings.
71
BIT SWITCHES
SP No. 1-105-008
SP No. 1-105-011
B779