Address
limit (high byte)
PABX busy tone frequency lower
680529
limit (low byte)
68052A
Busy tone ON time: range 1
68052B
Busy tone OFF time: range 1
68052C
Busy tone ON time: range 2
68052D
Busy tone OFF time: range 2
68052E
Busy tone ON time: range 3
68052F
Busy tone OFF time: range 3
680530
Busy tone ON time: range 4
680531
Busy tone OFF time: range 4
Busy tone continuous tone
680532
detection time
Busy tone signal state time tolerance for all ranges, and number of cycles
required for detection (a setting of 4 cycles means that ON-OFF-ON or
OFF-ON-OFF must be detected twice).
Tolerance (±)
680533
Bit 1: 0, Bit 0: 0 = 75% Bits 2 and 3 must always be kept at 0.
Bit 1: 0, Bit 0: 0 = 50% Bits 2 and 3 must always be kept at 0.
Bit 1: 0, Bit 0: 0 = 25%
Bit 1: 0, Bit 0: 0 = 12.5%
Bits 7, 6, 5, 4 - number of cycles required for cadence detection
International dial tone frequency
680534
upper limit (high byte)
International dial tone frequency
680535
upper limit (low byte)
680536
International dial tone frequency
SM
Function
121
NCU Parameters
Unit
Remarks
contain FF(H), tone
detection is disabled.
20 ms
-
20 ms
If both addresses
Hz (BCD)
contain FF(H), tone
detection is disabled.
Hz (BCD)
If both addresses
D346