Ring trip apparatus for a line circuit connected to dco switch

Details Ring trip apparatus for a line circuit connected to dco switch Ring trip apparatus for a line circuit connected to dco switch

H - Electricity

04

M

379/16

H04M 3/02 (2006.01)

Patent

CA 1134970

ABSTRACT A ring trip circuit adapted for use in a community office switching system that includes a call control processor and a port event processor. The call control processor and port event processor interact through a port storage unit that contains information corresponding to each telephone line con- nected to the switching system. The switching system also in- cludes a ringing generator for transmitting ringing signals onto a telephone line to a called party. Windings for a common bridge relay connect in circuit with each telephone line and diodes shunt the windings so the relay responds only to signals of one polarity. The contacts of the common bridge relay, therefore, reflect the duty cycle of the signal through the common bridge relay and this duty cycle varies when the called party goes off hook during a ringing burst. The common bridge relay produces a supervisory signal that is sampled and trans- ferred, for each telephone line, to a corresponding port stor- age area. A single ring trip analyzer sequentially monitors each port storage means during a ringing operation to determine whether the supervisory signal indicates that the called in- strument has been taken off hook. When this occurs, the ana- lyzer updates control information in a corresponding port stor- age area to control the state of a ring relay. The ring relay then opens and removes the ringing signal from the correspond- ing telephone line. The analyzer also detects offhook status during intervals between successive ringing bursts and during normal operations when a subscriber lifts a telephone off hook in order to place a call.

318600

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