Ricoh D025 Service Manual page 1485

NCU Parameters
Address
Voltage setting to detect off-hook
for voltage/DP detection for an
externally connected line.
Here is a summary of the fixed voltage settings
(1: Fixed) for an externally connected line.
Bit 7
6805E3
0
0
0
1
1
Bit 1 sets the level
of the call signal, Bit
6805E4
3 sets the call
signal impedance
6805E5
Bit 0 sets the ring
detection method,
Bit 1 sets the ring
detection method
when fixed.
Here is a summary of the voltages for the
detection of off-hook for DP detection.
D393
Function
Bit 6 Bit 5 Bit 4
0 0 0
0 0 1
0 1 0
0 0 0
1 1 1
Bit 1
Bit 3
Bit 0
Bit 1
Unit
0: Auto
1: Fixed V
-
Not used
2.75 V
5.5 V
22 V
41.25 V
0 RT=0 (Low)
1 RT=1 (High)
0 RZ=0 (High)
RZ=1
1
(Composite)
0 Auto
1 Fixed
0 Use RDTP
1 Use RDTN
144
Remarks
communication errors
occur frequently during
V.17 reception.
Do not change these
settings
-
If any setting is changed,
select a setting that is
higher than the default
setting.
SM