JPH0139010Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a central office line trunk call termination test device using a central office line direct switching circuit.

In a private branch exchange that accommodates conventional central office lines, the main distribution frame (abbreviation: MDF) is used to test the incoming call of the central office line trunk.
The function of the central office line trunk is tested by separating the terminal on the central office line side and the terminal on the trunk side using a test bullet, and placing both sides into a separately installed testing device, and transmitting a ringing signal to the central office line trunk from the test device. was. This required test ammunition and testing equipment, which led to increased costs and complicated testing procedures, among other problems.

The object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a central office line trunk call termination test system that is easy to operate and inexpensive.

A feature of the present invention is that when performing an incoming call test on a central office line trunk, the night direct switching device installed in the private branch exchange that accommodates the central office line is controlled by switching key information provided individually or in common, and the central office line is directly connected. Connect the extension terminal in which the night direct extension is accommodated as a general telephone and the trunk of the office line under test using the direct switching relay contact in the night direct switching device, and connect the extension terminal to the test equipment (e.g. telephone , a relay stand), the call is sent to the central office line trunk as a pseudo central office line incoming call, and an incoming call test on the central office line trunk can be easily performed.

A detailed explanation will be given below with reference to the drawings.

TSTE is test equipment, COT is central office trunk,
NW is exchange network, ATT is relay stand, MDF
indicates the main distribution board.

When performing a station line incoming test, pull the station line and station trunk into the TSTE using an MDF test weapon,
A pseudo incoming signal is sent from the TSTE, received by the central office line trunk, and then tested to see if it is connected to the relay stand through normal operation. For this reason, test ammunition was required for MDF, and testing equipment was also required, which resulted in poor operability and increased prices.

FIG. 2 is a relay system diagram showing an embodiment of the present invention. EXTA is a general extension telephone, IOT is a mutual extension trunk, NTSW is a night direct switching circuit, K ⁰ ~
K ² indicates the contact point of the internal switching relay. Also
EXTB is a telephone for answering incoming calls on the central office line during nighttime switching, and is normally housed in the line circuit indicated by T and used as a general telephone.

When an incoming call test on the central office line trunk is required, a separately provided switching key operates a K relay (not shown), and its contacts K ¹ and K ² switch the central office line to the direct telephone EXTB. After that, when a call is received from a regular telephone to the extension terminal T by extension interconnection, the ringing signal to the T terminal is sent to COT via K ⁰ , and the call signal is sent to the central office line trunk depending on whether or not it is connected to the relay board as an incoming call. It becomes possible to test incoming calls.

When testing after switching over at night, it is more reliable to call the extension terminal T from the relay console, make a pseudo-incoming call to the trunk of the central office line, answer it at another relay console, and confirm the normality of the call between the relay consoles. This makes it possible to test incoming calls on central office line trunks.

As described above, according to the present invention, by adding the K ⁰ contact shown in FIG. 2 to the night switching device,
It becomes possible to test incoming calls on central office line trunks without installing special test equipment or special construction work. Furthermore, if the main test is to be conducted only at night, a common night-time switching key can be used, eliminating the need for individual switching keys, further increasing economic efficiency.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a relay device used in a conventional central office line termination test, and FIG. 2 is a diagram of a relay device showing an embodiment of the present invention. NW...exchange network, COT...office line trunk, MDF...main distribution board, TSTE...test equipment, ATT...relay stand, EXTA...general telephone,
KXTB...Direct telephone, T...Extension terminal, IOT
...Extension mutual trunk, ^K0 to ^K2 ...Switching relay contact, NTSW...Night direct switching circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a private branch exchange equipped with a night direct switching circuit that connects and switches a telephone housed in an extension terminal to the central office line side using a relay contact, the night direct switching circuit includes: A relay contact is provided to switch the connection of the office line trunk from the office line side to the extension terminal to which the telephone was connected, and an incoming call to the extension terminal is connected to the office line trunk via the night direct switching circuit. Central office line trunk incoming call test equipment. 2. In the scope of claims for utility model registration, paragraph 1, it is stated that the relay for the relay contact for switching the connection of the telephone to the central office line side and the relay for the relay contact for switching the connection of the central office line trunk to the extension terminal are connected to a common A central office line trunk incoming call testing device that operates with a switching telephone key.