Maxim Integrated Teridian V.22 bis Linux Softmodem for 73M1822/73M1922 MicroDAA - Manual (Page 57)

UG_1x22_043 V.22 bis Linux Softmodem for 73M1x22 MicroDAA User Guide
Rev. 1.5 57
Double cadence:
The cadence has a regular On and Off time, A, followed by a On and Off time, B, and
provided that it meets the requirements in terms of frequency and level, it will be
considered as a valid call progress tone after a certain time of validation (see S67 or S23).
An example of this is the cadence for the Italian dial tone.
Double Cadence A and B
Cadence A min and max On time
Cadence A min and max Off time
Cadence B min and max On time
Cadence B min and max Off Time
+ Validation time