Ricoh A230, Service Manual, Page: 797 / 1134

NCU PARAMETERS
4-72
A230/A231/A232 SM
NOTES
1. If a setting is not required, store FF in the address.
2. Italy and Belgium only
RAM address 48045E: 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.
480408 (if bit 0 = 1) or 480438 (if bit 2 = 1): tolerance for on or off state
duration (%), and number of cycles required for detection, coded as in address
480433.
48040B (if bit 0 = 1) or 48043B (if bit 2 = 1): on time, hex code (unit = 20 ms)
48040C (if bit 0 = 1) or 48043C(if bit 2 = 1): off time, hex code (unit = 20 ms)
3. Pulse dial parameters (addresses 48044A to 48044F) 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
480452/480454/480455
dBm
Low frequency tone: - 0.5 x (N
480452/480454/480455
+ N
480453
) dBm
Note: N
480452
, for example, means the value stored in address 480452(H)
6. 48044A: Europe - Between Ds opening and Di opening, France - Between Ds
closing and Di opening
48044D: 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 4804B5h. Tones which frequency is higher
than 1500Hz refer to the setting at 4804B6h.
8. Polarity change detection in transmission starts after dialing has been finished
in automatic dialing mode, or after Start key is pressed in manual dialing mode.
Polarity change detection in reception should be enabled in Spain.