Ricoh A250 Service Manual page 524

NCU PARAMETERS
NOTES
1. If a setting is not required, store FF in the address.
2. Italy and Belgium only
RAM address 68045E: 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.
680408 (if bit 0 = 1) or 680438 (if bit 2 = 1): tolerance for on or off state
duration (%), and number of cycles required for detection, coded as in address
680433.
68040B (if bit 0 = 1) or 68043B (if bit 2 = 1): on time, hex code (unit = 20 ms)
68040C (if bit 0 = 1) or 68043C (if bit 2 = 1): off time, hex code (unit = 20 ms)
3. Pulse dial parameters (addresses 68044A to 68044F) 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
Low frequency tone: - 0.5 x (N
Note: N , for example, means the value stored in address 680452(H)
680452
6. 68044A: Europe - Between Ds opening and Di opening, France - Between Ds
closing and Di opening
68044D: 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 6804B5h. Tones which frequency is higher
than 1500Hz refer to the setting at 6804B6h.
A250
680452/680454/680455
680452/680454/680455
4-62
dBm
+ N ) dBm
680453
SM