Telephone exchange apparatus, interface circuit used in the...

Details Telephone exchange apparatus, interface circuit used in the... Telephone exchange apparatus, interface circuit used in the...

Category

H - Electricity

Subcategory

04

Subsubcategory

Q

IPC codes

H04Q 3/00 (2006.01) H04M 7/00 (2006.01)

Type

Patent

Patent number

CA 2472697

Description

A telephone exchange apparatus which selectively sets an interface circuit connecting a communication line adapted to connect a telephone terminal and having a communication control function for the telephone terminal, and adapted to communicate between the communication line and another communication line by applying a voltage necessary for operation to the interface circuit includes a display which displays information representing an operating state of the interface circuit, in the interface circuit, a detector which detects whether the voltage applied to the interface circuit is more than a reference value, and generate a detection result, in the interface circuit and a controller which controls the display to display the information representing the operating state based on the detection result.

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