US 5,210,740 A · Line switching equipment for switching a personal line to a backup ISDN line

Abstract

A terminal adapter portion sends and receives data of a data processing unit such as a data terminal device and information of a control portion through an ISDN line. The control portion responds to an externally supplied switching instruction to send switching instruction information to another line switching equipment or receive the information therefrom, through the ISDN line and to control a switching portion. The switching portion switches the data terminal device to either a personal line or the ISDN line depending upon the switching instruction. With this construction, it is possible to perform line switching control of two mutually opposing line switching equipments from either of them. Further, it comprises a line test portion for testing a line and a switching portion for switching the line test portion to either a personal line which is not connected to the data terminal device or the ISDN line, so that it is possible to easily perform a test of the personal line or the ISDN line without degrading on-line data communication.

Claims9

Dependent claims

Line switching equipment comprising:

DTE interface means connected to a data processing unit;
DCE interface means connected to a data line terminating service of a personal line;
terminal adapter means connected to an ISDN line for performing call sending control and call receiving control with respect to said ISDN line and performing interface conversion between input signals thereto and output signals therefrom;
switching means for selectively connecting said DTE interface means to either said DCE interface means or said terminal adapter means;
and
control means, responsive to an externally inputted signal and a control signal supplied from said ISDN line through said terminal adapter means, for controlling operations of said terminal adapter means and said switching means to send a confirmation signal associated with said control signal to said ISDN line through said terminal adapter means.

3 more elements

Line switching equipment comprising:

DTE interface means connected to a data processing unit;
DCE interface means connected to a data line terminating device of a personal line;
terminal adapter means connected to an ISDN line for performing call sending control and call receiving control with respect to said ISDN line and performing interface conversion between input signals thereto and output signals therefrom;
line test means for performing a test of said personal line through said DCE interface means and a test of said ISDN line through said terminal adapter means;
switching means including a first switch circuit for selectively connecting said DTE interface means to either said DCE interface means or said terminal adapter means and a second switch circuit for selectively connecting said line test means to either said DCE interface means or said terminal adapter means;
and
control means, responsive to an externally inputted signal and a control signal supplied from said ISDN line through said terminal adapter means, for controlling operations of said terminal adapter means, said line test means and said switching means to send a confirmation signal associated with said control signal to said ISDN line through said terminal adapter means.

4 more elements

Dependencies are inferred from the claim text.

Line switching equipment for switching a personal line to a backup ISDN line

Life of this patent

Line switching equipment for switching a personal line to a backup ISDN line

Life of this patent

Abstract

Claims9