CIRCUIT FOR SHUNTING CENTRAL OFFICE LINE AT SERVICE INTERRUPTION IN KEY PHONE SYSTEM AND METHOD FOR RECOVERING CENTRAL OFFICE LINE FROM SERVICE INTERRUPTION SHUNTING

Title:

CIRCUIT FOR SHUNTING CENTRAL OFFICE LINE AT SERVICE INTERRUPTION IN KEY PHONE SYSTEM AND METHOD FOR RECOVERING CENTRAL OFFICE LINE FROM SERVICE INTERRUPTION SHUNTING

Document Type and Number:

Japanese Patent JPH09172659

Kind Code:

A

Abstract:

PROBLEM TO BE SOLVED: To continue the usage of a general telephone set in recovering power interruption by providing the usage sensing means of the general telephone set. SOLUTION: A chip terminal and ring terminal relays 106 and 108 changeover a trunk line connected to a key phone trunk line containing circuit 114 into the general telephone set 112 at the time of power interruption. A circuit 110 sensing the usage state of the general telephone set 112 exists between the general telephone set 112 and the relays 106 and 108 and the usage of the general telephone set at the time of power interruption recovery is continued by the sensing result.

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Inventors:

BOKU BUNKIYON

Application Number:

JP29622196A

Publication Date:

June 30, 1997

Filing Date:

November 08, 1996

Export Citation:

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Assignee:

SAMSUNG ELECTRONIC

International Classes:

H04M1/715; H04M19/00; H04Q3/58; (IPC1-7): H04Q3/58

Domestic Patent References:

JPH04126444A	1992-04-27
JPS61121594A	1986-06-09

Attorney, Agent or Firm:

Takeshi Takatsuki

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