A communication system of the present invention utilizes ring detection circuitry
on both sides of an isolation barrier. More particularly, the ring detection circuitry
may include ring burst circuitry on the phone line side of the isolation barrier
and ringer timing circuits on the powered side of the isolation barrier. The digital
burst peak signal may be transmitted through the isolation banier to the finger
timing circuits. By splitting the ring detection circuitry so that the ringer timing
circuits are placed on the powered side of the isolation barriers, a significant
reduction in the power usage on the phone line side of the barrier related to the
ring detection function may occur. The outputs of the ringing timing circuits may
be provided to circuits on either side of the isolation barrier. Thus, the ring
detection function may be accomplished in a system utilizing an efficient bidirectional
capacitive barrier while still minimizing power usage on the line side of the barrier.
