Ricoh B121 Service Manual page 497

Address
6805 BD
Modem turn-on level (incoming
signal detection level)
6805BE Not used
to
6805C6
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 Not used
to
6805D9
6805DA T.30 T1 timer
6805E0 Maximum wait time for post
bit 3 message
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.
SM
Function
59
NCU PARAMETERS
Unit Remarks
-37-0.5N
(dBm)
Do not change the
settings.
Do not change the
settings.
1 s
0: 12 s 1: Maximum wait time for
post message
1: 30 s
(EOP/EOM/MPS) can be
changed to 30 s.
Change this bit to "1" if
communication errors
occur frequently during
V.17 reception.
B620