Ricoh FAX2900L Service Manual page 130

NCU PARAMETERS
NOTES
1. If you change the NCU country code and exit the service mode, the bit switch
country code (System Bit Switch 0F) will automatically be changed to the same
country code.
2. If a setting is unnecessary, store FF in the address.
3. In, Europe, if the country code is not specified, set it to UK (02).
4. Italy and Belgium only
RAM address 81E55E: 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 change.
81E508 (if bit 0 = 1) or 81E538 (if bit 2 = 1): tolerance for on or off state
duration (%), and number of cycles required for detection, coded as in address
81E533.
81E50B (if bit 0 = 1) or 81E53B (if bit 2 = 1): on time, hex code (unit = 20 ms)
81E50C (if bit 0 = 1) or 81E53C(if bit 2 = 1): off time, hex code (unit = 20 ms)
5. Pulse dial parameters (addresses 81E54A to 81E54F) are the values for 10
PPS. If 20 PPS is used, the machine automatically compensates.
6. The first ring may remain undetected until 1 to 2.5 wavelengths after the time
specified by this parameter.
7. 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 81E552(H)
81E552
8. 81E54A: Europe - Between Ds opening and Di opening, France - Between Ds
closing and Di opening
81E54D: Europe - Between Ds closing and Di closing, France - Between Ds
opening and Di closing
9. The actual inter-digit pause (pulse dial mode) is the sum of the periods
specified by the RAM addresses 81E54A, 81E54D, and 81E54E.
/ dBm
81E552 81E554
/ + N
81E552 81E554 81E553
4-50
21 May, 1999
) dBm