Maxim Integrated 73M1822/73M1922 Implementers Guide - Manual (Page 18)

73M1822/73M1922 Implementer’s Guide UG_1x22_052
18 Rev. 1.0
Begin @ ring_timer expires
1. If (ring_last - ring_first) < 150 ms Polarity Reversal Event
2. Else Ring Burst
a. ring_duration = ring_last – ring_first
b. ring_frequency – 2* ring_count / ring_duration)
End
@ ring_timer
expires
If(ring_last –
ring_first) <
150ms
RING_BURST
End
Polarity
Reversal
TRUE