Ricoh D131 Service Manual page 1081

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:

– 0.5 x N
680552

– 0.5 x N
680555
Low frequency tone:

– 0.5 x (N
680552

– 0.5 x (N
680555

N
680552
6. 68054A: Europe - Between Ds opening and Di opening, France - Between Ds closing and Di
opening
68054D: Europe - Between Ds closing and Di closing, France - Between Ds opening and Di
closing
7. Tone signals which frequency is lower than 1500Hz (e.g., 800Hz tone for AI short protocol)
refer to the setting at 6805B5h. Tones which frequency is higher than 1500Hz refer to the
setting at 6805B6h.
8. 68054A, 68054D, 68054E: The actual inter-digit pause (pulse dial mode) is the sum of the
period specified by the RAM addresses 68054A, 68054D, and 68054E.
SM
/ –3.5 dBm
680554
dBm
/ + N ) –3.5 dBm
680554 680553
+ N ) dBm
680553
, for example, means the value stored in address 680552(H)
189 D619