JPS6248166A - Operation test system for digital subscriber circuit - Google Patents

Abstract

PURPOSE:To attain a test with simple constitution by providing a means for changing over in a pseudo way the operating mode of a large-scale integrated circuit as a component with respect to plural digital subscriber circuits to the terminal controller mode. CONSTITUTION:A signal processing section 9-1 is controlled by generating a mode changeover signal from a line processor 11-1 in a digital subscriber circuit 3-1 to change over a selector 13-2 at the same time. Then a signal pattern for operating test is sent from a random pattern sending circuit 30-2 to a digital subscriber circuit 3-2 via a network 4. The said signal is sent to the digital subscriber circuit 3-1 and the signal reaching a network interface 10-1 via a transmission terminator 8-1 of the said circuit and the signal processing section 9-1 is returned at the entrance and inputted once again to the signal processing section 9-1. The signal reaches the transmission terminator 8-1 and further the network 4 from the signal processing section 9-1 and is received by a random reception circuit 30-3. Thus, the operating test of the digital subscriber circuit 3-2 is conducted.

Description

[Detailed Description of the Invention] [Summary] Switching the operation mode of a large-scale integrated circuit (LSI) used for signal processing inside a co-digital subscriber circuit, making the circuit pseudo-correspond to a terminal control device, This method tests the operation of a digital subscriber circuit in collaboration with other digital subscriber circuits connected in parallel.

[Industrial Field of Application] The present invention relates to an operation test method for digital subscriber circuits that allows convenient operation tests of digital subscriber circuits connected between an electronic exchange and a digital terminal.

[Conventional technology]

Data terminals and electronic computers were connected to electronic exchanges, and digital subscriber circuits began to be connected in addition to analog subscriber circuits for connecting conventional analog telephones. The digital subscriber circuit includes data terminals,
In addition to an electronic computer, a digital telephone can of course be connected. However, for ordinary data terminals/electronic computers, it is necessary to insert a terminal control device as shown in the conventional system configuration diagram shown in FIG. In FIG. 3, numeral 1 is the data terminal DTE, 2 is the terminal control unit DSU, and 3-1 is the data terminal DTE.
．． 3-2 is a digital subscriber circuit DLC14 is a network NW, 5 is a digital telephone device, 6 is a signal reception distribution device SRD, and 7 is a central processing unit CPR.

Digital subscriber circuit 3-1.3-2 (DLC) is
Data terminal 1 (DTE) and terminal control device 2 (
DSU) has been inserted and connected and is operating. When connecting to the digital telephone 5 (installed), the terminal control device 2
There is no need to insert a (DSU).

(This is because the main operating parts of the terminal control device 2 are built into the digital telephone 5.) [Problems to be solved by the invention] Digital subscriber circuit 3-1.3-2 (DLC) When testing the operation, use the digital telephone 5 (position).
Alternatively, it was necessary to connect the terminal control unit 22 (DSU). It is a digital subscriber circuit 3-
This is because the internal configuration of L3-2 (DLC) is as shown in FIG. In FIG. 4, 2 is a terminal control device DS, U, and 3 is a digital subscriber circuit DL.
C18 is a transmission termination unit LT, 9 is a signal processing unit CT which normally uses a large-scale integrated circuit, and 10 is a network interface NWINF.

11 is a line processor LPR that exchanges signals with the central processing unit 7, and 12 is a central processing unit interface CPl'l INF.

Further, 21 is a signal processing unit CT in the terminal control device 2;
2 indicates the transmission termination section LT. As shown in FIG. 4, the signal processing unit 9 (CT) has the same circuit configuration as that in the digital subscriber circuit 3 and the signal processing unit 21 in the terminal control device 2. is operated permanently in slave mode. Since a large number of digital subscriber circuits 3 (DLC) are connected to the exchange network 4 (NW), when testing their operation, it is necessary to check the signals that have passed through two signal processing units with different operation modes.

Therefore, on the terminal side of the digital subscriber circuit 3 (DLC), there is either a terminal control unit 2 (DSU) or a digital telephone 5.
It was necessary to connect the (installation).

An object of the present invention is to provide an operation test method for a digital subscriber circuit that can be tested with a simple configuration by using only the digital subscriber circuit without connecting a terminal control device or a digital telephone to the terminal side. be.

[Means for Solving the Problems] FIG. 1 is a block diagram showing the configuration of the present invention, and only the digital subscriber circuit is shown. In Figure 1,
3-1 is a digital subscriber circuit slightly modified in the present invention, 3-2.3-3.3-4 is the same digital subscriber circuit as the conventional one, and 8-1 8=2 is a transmission termination section LT.
, 9-1.9-2 is a signal processing unit CT, 10-1.10-
2 is NF by network interface N, 11-L
11-2 is line processor LPR112-L 1
2-2 is a central processing unit interface CPRINF,
13 1 is a control signal line of the line processor 11-1, which is a large-scale integrated circuit (signal processing unit 9-1) as a component.
13-2 shows an example in which a selector 13-2 adds the essential requirements for a means for pseudo-switching the operation mode of a device (within a terminal) to a terminal control device mode as a means for switching as described above.

[Operation] When performing an operation test on the digital subscriber circuit 3-2, the line processor 11-1 of the digital subscriber circuit 3-1 controls its own signal processing unit 9-1 to change the operation mode. When the signal is transmitted through the connection line 13-1, the selector 13-2 is simultaneously switched. The signal from the signal processing section 9-1 (CT) to the network interface 10-1 (NWINF) is turned back at its entrance and is once again input to the signal processing section 9-1 (CT). At this time, the test signal is transmitted, for example, from the line processor 11-2 in the digital subscriber circuit 3-2, applied to the signal processing section 9-2 (CT), and transmitted from the transmission termination section 8-2 (LT). It is input to the digital subscriber circuit 3-1. Next, the transmission terminal section 8-1 (
LT) to the signal processing section 9-1 (CT). Due to the operation of the selector 13-2 mentioned above, the signal is transferred from the signal processing section 9-1 (CT) to the transmission termination section 8-1 (
LT), and then return to →transmission terminal section 8-2 (LT) - signal processing section 9-2 (CT). Therefore, when this signal is judged by the line processor 11-2, it is possible to judge whether the digital subscriber circuit 3-2 is good or bad.

Next, as for the digital subscriber circuit 3-3, by applying a signal from a line processor (not shown) in the same circuit to the digital subscriber circuit 3-1, the digital subscriber circuit 3-3 operates based on the returned signal in the same manner as described above. Conduct the test.

[Embodiment When co-operating co-digital subscriber circuit 3-2, 3-3, etc. with digital subscriber circuit 3-1 for operation testing, any one of co-digital subscriber circuits 3-2, 3-3 is further connected to a terminal. If it is possible to switch to the operation mode of the control device, it is possible to perform an operation test on everything including the digital subscriber circuit 3-1.

In addition to sending test signals from the line processor within its own circuit, testing can also be performed via the network 4 (NW). FIG. 2 is a diagram showing the configuration of such an embodiment. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same things, 30 is a network random pattern sending/receiving circuit, 3°-1 is a line processor, 30-2 is a random pattern sending circuit, and 30-3 is a network random pattern sending/receiving circuit. A random pattern receiving circuit is shown. A mode switching signal is issued from the line processor 11-1 in the digital subscriber circuit 3-1 to control the signal processing section 9-1 and simultaneously switch the selector 13-2. Next, a signal pattern for operation testing is sent from the random pattern output path 30-2 to the digital subscriber circuit 3-2 via the network 4 (NW). The signal is transmitted to the digital subscriber circuit 3-1, and is sent to the network interface 1 via the transmission termination section 8-1 and signal processing section 9-1 of the circuit.
The signal that has reached 0-1 is turned back at the entrance and can be input once again to the signal processing section 9-1 (CT). This signal is transmitted from the signal processing section 9-1 (CT) to the transmission termination section 8-1.
(LT), and further one transmission termination section 8-2 (LT)→
From the signal processing unit 9-2 (CT)→network interface 1O-2 (NgaINF), the signal further reaches the network 4 (NW) as indicated by the arrow, and can be received by the random pattern receiving circuit 30-3. Line processor 30-
1, the received signal is determined and the digital subscriber circuit 3
-2 operation tests can be performed.

[Effects of the Invention] Thus, according to the present invention, it is possible to switch one operation mode of a plurality of digital subscriber circuits and perform an operation test on the digital subscriber circuits in the normal operation mode. Therefore, even if a large number of terminal control devices and digital telephones are not prepared when a new electronic exchange is installed, it is possible to quickly and easily perform a test.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 3 is a diagram showing the principle configuration of an electronic exchange system, and FIG. 1 is a diagram showing a conventional configuration of an intermediate terminal control device/digital subscriber circuit; FIG. 1--Data terminal DTE 2-Terminal control unit DSU 3, 3-1.3-2. -・Digital subscriber circuit DL
C4...Network NW 5...-Digital telephone device 7-Central processing unit CPR 8, 22--Transmission termination unit LT 9.21-Signal processing unit CT 10-Network interface NWINF11-
Line processor LPR 12-/Central processing unit interface CPRINT13
-1-m-control signal line 13-2- selector

Claims (1)

[Claims] A terminal control device (2) that controls the terminal (1) and a digital subscriber circuit (3) are connected to the terminal (1) and the electronic exchange (4).
) In the operation test method for digital subscriber circuits (3) in a system connected between a plurality of digital subscriber circuits (3-1), (3-2), etc. connected to an electronic exchange (4),・Means for pseudo-switching the operating mode of a large-scale integrated circuit as a component to a terminal controller mode for some of the above (13)
-1) An operation test method for a digital subscriber circuit.