Ricoh D649 Field Service Manual page 131

Address
Bit 1 sets the level of
the call signal, Bit 3
6805E4
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
0
0
0
1
1
NOTES
1. If a setting is not required, store FF in the address.
2. Italy and Belgium only
RAM address 68055E: the lower four bits have the following meaning.
Bit 2 - 1: International dial tone cadence detection enabled (Belgium)
Bit 1 - Not used
Bit 0 - 1: PSTN dial tone cadence detection enabled (Italy)
If bit 0 or bit 2 is set to 1, the functions of the following RAM addresses are changed.
680508 (if bit 0 = 1) or 680538 (if bit 2 = 1): tolerance for on or off state
duration (%), and number of cycles required for detection, coded as in address 680533.
Function
0
Bit 1
1
0
Bit 3
1
0
Bit 0
1
0
Bit 1
1
Bit 6 Bit 5 Bit 4
0 0 0
0 0 1
0 1 0
0 0 0
1 1 1
Unit
RT=0 (Low)
RT=1 (High)
-
RZ=0 (High)
RZ=1
(Composite)
Auto
Fixed
Use RDTP
Use RDTN
If any setting is changed,
select a setting that is higher
-
than the default setting.
Not used
2.75 V
5.5 V
22 V
41.25 V
NCU Parameters
Remarks
129