Ricoh B079, Service Manual

Page: 810 / 948

NCU PARAMETERS
B547 102 SM
Address Function Unit Remarks
6805BE
to
6805C6
Not used Do not change the
settings.
6805C7 Bits 0 to 3 – Not used.
Bit 4 – V.34 protocol dump
0: Simple, 1: Detailed (default)
Bits 5 to 7 – Not used.
6805C8
to
6805D9
Not used Do not change the
settings.
6805DA T.30 T1 timer 1 s
6805E0
bit 3
Maximum wait time for post
message 0: 12 s
1: 30 s
1: Maximum wait time for
post message
(EOP/EOM/MPS) can be
changed to 30 s.
Change this bit to “1” if
communication errors
occur frequently during
V.17 reception.
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: – 0.5 x N
680552/680554
–3.5 dBm
– 0.5 x N
680555
dBm
Low frequency tone: – 0.5 x (N
680552/680554
+ N
680553
) –3.5 dBm
– 0.5 x (N
680555
+ N
680553
) dBm
NOTE: N
680552
, for example, means the value stored in address 680552(H)