Ricoh D009 Service Manual page 976

NCU Parameters
Address
Here is a summary of the fixed voltage settings (1:
Fixed) for an externally connected line.
Bit 7
0
0
0
1
1
Bit 1 sets the level of
the call signal, Bit 3
6805E4
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.
Bit 7
0
0
0
D346
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
Bit 6 Bit 5
0 0
0 0
0 1
Unit
-
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
Bit 4 -
0 Not used
1 2.75 V
0 5.5 V
130
Remarks
-
If any setting is changed,
select a setting that is
higher than the default
setting.
SM