JPS5921161A - Folding test system - Google Patents

Abstract

PURPOSE:To reduce the working quantity and to prevent a fault generated by a misoperation, by performing a folding test through a spare system of a digital electronic exchange which is under a service stop state. CONSTITUTION:A folding signal T which permits a folding connection of a signal receiving/distributing device 5 and a service stop signal OS which shows the service stop of a spare system which is delivered when a channel device 2-1 is under working as a using system are supplied, and a selecting circuit 9 of a circuit individual part 3 within a channel device 2-0 is driven via a gate 10. The gate 10 is set to a conductive state by the signal T of an ordinary device 5. Under such conditions, the device 2-0 has a fault and is separated from an exchange, and the device 2-1 starts its working as an in use system. Thus the device 2-1 delivers the signal OS to drive the circuit 9. Then a signal receiving route 11 of a circuit corresponding part 1 connected to the part 3 is cut off, and a signal transmitting route 12-0 is connected to attain a folding connection to the part 3. Therefore a folding connection line is automatically set without requiring any operation when a folding test is applied to the device 2-0.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical field of the invention The present invention relates to a loopback test method, in particular, a single line handling section,
In addition, the present invention relates to a loopback test method in a digital electronic exchange in which at least the portion in contact with the line corresponding section adopts a duplex system configuration.

(b) Technical background FIG. 1 is a diagram showing an example of a digital electronic exchange to which the present invention is applied. In FIG. 1, only the line corresponding section and communication path device of the digital electronic exchange, which are the object of the present invention, are shown.

The line correspondence section 1 is provided for each transmission system device accommodated in the digital electronic exchange, and each has a single-layer configuration. The communication path device 2 includes a line individual section 3, a switch section 4, and a signal reception distribution device 5, and has a duplex configuration (in addition, when distinguishing each communication path device 2, the communication path device 2
-0 and communication path device 2-1). A plurality of line individual sections 3 are provided corresponding to the line corresponding sections 1, and time-division multiplex the signals transmitted from each corresponding line corresponding section 1 via the signal receiving path 11 and guide them to the switch section 4. The signals transmitted from the switch unit 4 are time-division multiplexed and separated, and transmitted to each corresponding line corresponding unit 1 via the signal transmission path 12. The switch unit 4 mutually exchanges signals from each line individual unit 3 in a time division manner. The signal reception and distribution device 5 distributes various command information transmitted from the central control device 6 that controls switching connections of the digital electronic exchange to each part in the communication path device 2, and also transmits information indicating the operating status of each part. The information is transmitted to the central control device 6. Normally, one of the duplex communication path devices 2 (for example, the communication path device 2-0) operates as the active system, and the other (for example, the communication path device 2-0) operates as the active system.
For example, the communication path device 2-1) is on standby as a standby system. Each line corresponding unit 1 transmits signals arriving from transmission system equipment to the working and protection system communication path devices 2-0 and 2-1 via the signal receiving path 11, and Signal transmission path 1 from path devices 2-0 and 2-1
The built-in selection circuit 7 selects only the signals transmitted from the active channel device 2 and transmits them to the transmission system device.

In such a state, if a fault or the like occurs in the active communication path device 2-0 and it becomes inoperable, the central control unit 6 immediately starts operating the backup communication path device 2-1 as the active system. After that, it is necessary to disconnect the affected communication line device 2-0 from the digital electronic exchange, perform diagnostic repair, and restore the standby state as a standby system as soon as possible. As a diagnostic method for accurately discovering the fault location in the affected communication path device 2-0, the signal receiving path 12-0 from each line individual section 3 to the corresponding line corresponding section 1 is looped back and the signal receiving path 12-0 is routed back from the line corresponding section 1 to the line. After connecting to the signal reception path 11 leading to the individual section 3, the diagnostic signal transmitted from the central control device 6 is transmitted to the signal reception distribution device 5, the switch section 4, the individual line section 3, and the signal transmission path 12- connected back. It is known that the signal is received again by the central control unit 6 via the signal reception path 11 and the signal reception path 11, and is compared with the transmitted signal.

(c) Prior Art and Problems FIG. 2 is a diagram showing an example of this kind of conventional folding test method. In FIG. 2, only one set of each of the line handling section 1 and the line individual section 3 in the communication path device 2 is shown, and the others are omitted. In FIG. 2, terminals T1 to T4 are provided on signal transmission paths 12-0 and 12-1 and signal reception path 11 from each communication path device 2-0 and 2-1 to line correspondence section 1, respectively. . In the communication path device 2 which is currently in a normal state, terminals T1 and T2 and T3 and T4 are connected, respectively.
Signal transmission paths 12-0, 12-1 and signal reception path 1
1 connects the line correspondence section 1 and the line individual section 3.

As mentioned above, when the communication path device 2-0 is affected and a loopback test is performed by disconnecting it from the digital electronic exchange, the terminals T1 and T2 and T3 and T4 of the communication path device 2 are disconnected, respectively. By connecting terminals T1 and T3, the signal transmission path 12-0 and signal reception path 11 as described above are connected back.

As is clear from the above explanation, in the conventional loopback test method, terminals T1 to T4 are connected to the signal transmission path 12 and the signal reception path 11 that connect each line corresponding section 1 and the line individual section 3 in the communication path device 2. When carrying out a fold-back test, it is necessary to change the connection between the terminals T1 to T4, which increases the size of the device and increases the amount of work, and there is a risk of failure due to incorrect connection change.

FIG. 3 is a diagram showing another example of the conventional folding test method. In FIG. 3, each line individual section 3 in the communication path device 2 is provided with a selection circuit 9 for return connection.

The selection circuit 9 selects the signal receiving path 11 from the line corresponding section 1 from two inputs, the signal receiving path 11 from the normal line corresponding section 1 and the signal transmitting path 12 from the line individual section 3, and selects the signal receiving path 11 from the line corresponding section 1. Connected to 3. When carrying out a return test on the call path device 2-0, a signal from the return call path device 2 that specifies the line individual section 3 to be connected back is sent from the typewriter device 8 attached to the central control device 6. The command is transmitted to the reception distribution device 5, and command information for connection is input. The central control unit 6 reaches the designated line individual unit 3
The selection circuit 9 corresponding to the selection circuit 9 is driven. The selection circuit 9 is a signal receiving path 11 from the line corresponding section 1 connected to the individual line section 3.
and signal reception path 12-0 from individual line section 3.
By connecting , loopback connection to the individual line section 3 is achieved.

As is clear from the above explanation, in the conventional foldback test method, it is necessary to input predetermined command information from the typewriter device 8 each time a foldback test is performed, which also increases the amount of work and may result in incorrect commands. Inputting information may cause problems.

(d) Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of the conventional loopback test method as described above, to reduce the amount of work when setting loopback connections as much as possible, and to prevent failures due to incorrect connection changes. The objective is to economically realize a fold-back test method that prevents as much as possible.

(e) Structure of the Invention The object of the present invention is to provide a digital electronic exchange having a system configuration in which the line handling section is single-layered and at least the part that contacts the line handling section is duplexed, when the backup system of the duplexing section is out of service. means is provided for connecting a signal transmission path from the protection system to the line correspondence section back to a signal reception path from the line correspondence section to the protection system by transmitting a signal indicating that the protection system exists from the working system. This is achieved by enabling the standby system in the out-of-service state to perform diagnostic tests.

(f) Examples of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a diagram showing a folding test method according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 4, a selection circuit 9 provided in each line individual unit 3 in the communication path device 2-0 selects a return signal T that allows return connection from the signal reception distribution device 5, and a selection circuit 9 provided in each line individual section 3 in the communication path device 2-0. The device 2-1 is driven through a gate 10 to which is input a service stop signal OS indicating that the standby system is in a service stop state, which is output when the device 2-1 is operating as an active system. The return signal T from the normal signal receiving and distributing device 5 makes the gate 10 conductive. In such a state, when the communication path device 2-0 is damaged and disconnected from the digital electronic exchange, and the communication path device 2-1 starts operating as the active system, the communication path device 2-1 receives the service stop signal. The OS is output and each selection circuit 9 is driven through the conductive gate 10 of the communication path device 2-0. As a result, each selection circuit 9 disconnects the signal receiving path 11 from the line corresponding section 1 connected to the individual line section 3, and connects the signal transmission path 12-0 from the individual line section 3, as in FIG. By doing so, loopback connection to the individual line section 3 is achieved. Therefore, when performing a return test on the communication path device 2-0, a return connection path is automatically set without requiring any operation. If it is necessary to prevent the setting of the return connection path for some reason, the return signal T from the signal reception distribution device 5 can be blocked from the gate 10 by inputting the required command information from the typewriter device 8. By changing the state, the communication path device 2
The service stop signal OS output from -1 is the selection circuit 9.
driving is prohibited.

As is clear from the above explanation, according to this embodiment, the call path device 2-0 in the service outage state automatically returns the call back by the service outage state OS output from the active call path device 2-1. Testing is now possible, no operation is required to set the return connection path, and failures due to erroneous operations are prevented.

It should be noted that FIG. 4 is merely one embodiment of the present invention, and for example, the configurations of the line handling section 1 and the communication path device 2 are not limited to those shown, and many other modifications may be considered. However, the effects of the present invention do not change in either case. Further, the duplexed portion connected to the line correspondence section 1 is not limited to the communication path device 2, and many other modifications may be considered, but the effects of the present invention will not change in any case.

(g) Effects of the Invention According to the present invention, in the digital electronic exchange, a state in which a loopback test is possible for the standby system in which the service of the duplexed part adjacent to the line corresponding part is out of service is somehow controlled. Settings are automatically made without the need for any errors, preventing failures caused by erroneous operation, and eliminating the need for terminals for changing connections, promoting downsizing and economy.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a digital electronic exchange to which the present invention is applied, FIG. 2 is a diagram showing an example of a conventional loopback test method, and FIG. 3 is a diagram showing another example of a conventional loopback test method. , FIG. 4 is a diagram showing a folding test method according to an embodiment of the present invention. In the figure, 1 is a line support section, 2 is a communication path device, 3 is a line individual section, 4 is a switch section, 5 is a signal reception distribution device, and 6
is a central control unit, 7 and 9 are selection circuits, 8 is a typewriter device, 10 is a gate, 11 is a signal reception path, 12 is a signal transmission path, T1 to T4 are terminals, T is a return signal, and OS is a service stop signal. , is shown. Figure 1

Claims (1)

[Claims] In a digital electronic exchange that adopts a system configuration in which the line handling section is single-layered and at least the other portion that contacts the line handling section is duplexed, a signal indicating that the backup system of the duplexing section is in a service outage state is sent from the active system. By providing a means for connecting the signal transmission path from the protection system to the line support section back to the signal reception path from the line support section to the protection system, the service is stopped. A loop test method characterized by the preliminary system enabling diagnostic tests.