1-8. BLOCK DIAGRAM PRESENTATION. (CONT)
This circuit functions only when a 570 Hz seize or release acknowledge signal is received from a switching facility. The circuit performs
the five following functions:
When acknowledge signals are received, the circuit provides a delay to allow time for seize or release tones to be transmitted to a
Stops the tone ringer circuit while an acknowledge signal is being received.
Energizes the latch circuit while the seize acknowledge signal is being received.
Energizes the release timer discharge circuit 800 milliseconds after a release acknowledge signal Is received from the switching facility.
Energizes the acknowledge delay timer circuit which stops the tone ringer circuit for 450 milliseconds after the acknowledge sequence.