Service manual

Bit Switches
D127/D128 5-54 SM Appendix
5 Not used Do not change the settings.
6
Parameter selection for dial tone
detection
0: Normal parameter
1: Specific parameter
0: This uses the fixed table in the ROM for
dial tone detection.
1: This uses the specific parameter
adjusted with SRAM (69ECBEH -
69ECDEH). Select this if the dial tone
cannot be detected when the "Normal
parameter: 0" is selected.
7 Not used Do not change the settings.
G3 Switch 08 - Not used (do not change the settings)
G3 Switch 09 [SP No. 1-105-008]
No FUNCTION COMMENTS
0-1
ISDN cable equalizer
(tx mode: Internal)
Bit 1: 0, Bit 0: 0 = None
Bit 1: 0, Bit 0: 1 = Low
Bit 1: 1, Bit 0: 0 = Medium
Bit 1: 1, Bit 0: 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.
Use the dedicated transmission parameters
for specific receivers.
Also, try using the cable equalizer if one or
more of the following symptoms occurs.
Communication error
Modem rate fallback occurs frequently.
 This setting is not effective in V.34
communications.