Ricoh D117 Service Manual page 1192

Address
Bit 1 sets the level
of the call signal, Bit
6805E4
3 sets the call
signal impedance
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.
6805E5
Bit 7 Bit 6
0 0
0 0
0 0
1 0
1 1
SM
Function
0 R T = 0 (Low)
Bit 1
1 R T = 1 (High)
0 RZ = 0
Bit 3
RZ=1
1
(Composite)
0 Auto
Bit 0
1 Fixed
0 Us
Bit 1
1 Us
Bit 5 Bit 4 -
0 0
Not used
0 1 2.75 V
1 0 5.5 V
0 0 22 V
1 1 41.25 V
135
Unit Remarks
-
(High)
e RDTP
e RDTN
If any setting is changed,
select a setting that is
higher than the default
setting.
NCU Parameters
D649