Service manual

Bit Switches
SM Appendix 5-55 D127/D128
Appendix:
Fax Trouble-
Shooting
Guide
2-3
ISDN cable equalizer
(rx mode: Internal)
Bit 3: 0, Bit 2: 0 = None
Bit 3: 0, Bit 2: 1 = Low
Bit 3: 1, Bit 2: 0 = Medium
Bit 3: 1, Bit 2: 1 = High
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.
 This setting is not effective in V.34
communications.
4
ISDN cable equalizer
(V.8/V.17 rx mode: External)
0: Disabled
1: Enabled
Keep this bit at “1”.
5-7 Not used Do not change the settings.
G3 Switch 0A [SP No. 1-105-011]
No FUNCTION COMMENTS
0-1
Maximum allowable carrier
drop during image data
reception (ms)
Bit 1: 0, Bit 0: 0 = 200
Bit 1: 0, Bit 0: 1 = 400
Bit 1: 1, Bit 0: 0 = 800
Bit 1: 1, Bit 0: 1 = Reserved
These bits set the acceptable modem carrier
drop time.
Try using a longer setting if error code 0-22 is
frequent.
2
Select cancellation of
high-speed RX if carrier signal
lost while receiving
0: Off
1: On
This switch setting determines if high-speed
receiving ends if the carrier signal is lost when
receiving during non-ECM mode