Ricoh B230 Service Manual page 1053

Address
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
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.
68050B (if bit 0 = 1) or 68053B (if bit 2 = 1): on time, hex code (unit = 20 ms)
68050C (if bit 0 = 1) or 68053C (if bit 2 = 1): off time, hex code (unit = 20 ms)
3. Pulse dial parameters (addresses 68054A to 68054F) are the values for 10 pps. If 20
pps is used, the machine automatically compensates.
4. The first ring may not be detected until 1 to 2.5 wavelengths after the time specified
by this parameter.
5. The calculated level must be between 0 and 10.
The attenuation levels calculated from RAM data are:
High frequency tone:
SM
Function
(Composite)
0 Auto
Bit 0
1 Fixed
0 Use RDTP
Bit 1
1 Use RDTN
Bit 5 Bit 4
0 0 0
0 0 1
0 1 0
0 0 0
1 1 1
103
NCU Parameters
Unit Remarks
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
B786