Ricoh D146 Service Manual page 1944

Address
PSTN dial tone permissible drop
68050C
time
68050D PSTN wait interval (LOW)
68050E PSTN wait interval (HIGH)
PSTN ring-back tone detection
68050F
time
PSTN ring-back tone off detection
680510
time
PSTN detection time for silent
680511 period after ring-back tone
detected (LOW)
PSTN detection time for silent
680512 period after ring-back tone
detected (HIGH)
PSTN busy tone frequency upper
680513
limit (high byte)
PSTN busy tone frequency upper
680514
limit (low byte)
PSTN busy tone frequency lower
680515
limit (high byte)
PSTN busy tone frequency lower
680516
limit (low byte)
PABX dial tone frequency upper
680517
limit (high byte)
PABX dial tone frequency upper
680518
limit (low byte)
PABX dial tone frequency lower
680519
limit (high byte)
PABX dial tone frequency lower
68051A
limit (low byte)
D163
Function
168
Unit
-
Detection is disabled if
20 ms
this contains FF.
20 ms -
20 ms -
20 ms -
If both addresses
Hz (BCD) contain FF(H), tone
detection is disabled.
If both addresses
Hz (BCD) contain FF(H), tone
detection is disabled.
If both addresses
Hz (BCD) contain FF(H), tone
detection is disabled.
If both addresses
Hz (BCD) contain FF(H), tone
detection is disabled.
Remarks
SM