JPS61258599A - Multistage connection network - Google Patents

Abstract

PURPOSE:To attain prompt detection of a faulty portion and reduced costs by judging the result of continuity test under detecting state of continuity test signal in a detecting means of each switching network connected multistagewise. CONSTITUTION:When specified continuity test information is inputted for continuity test of the following communication path; communication wire 40n - matrix switch 10K of a switching network 1 - communication line 501 - matrix switch 201 of the switching network 2 - communication line 60y - matrix switch 30Y of the switching network 3 - communication line 701, detection circuits 13K, 231 and 33Y are in non-operating states against earth signals and no detection display signals are outputted to read circuit 90, provided that communication line is under normal condition. Then if a selector 92 is connected with continuity test signal generation circuit 93, the continuity test signal is detected and the signal is sent to the read circuit 90 through respective signal lines 5-7. When the read circuits 90 are unable to read the detection display signal from the signal line 7, the fault of communication wires 60y, switching points of the switches 30Y as well as a path of the communication line 701 can be judged promptly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multistage connection network, and more particularly to a multistage connection network that can efficiently perform continuity tests.

[Conventional technology]

In general, communication systems such as telephone exchanges that selectively connect multiple input communication lines and multiple output communication lines to form a communication path are multistage connections in which multiple switching networks (lattice networks) are cascaded in multiple stages. Has a net. In order to maintain the reliability of the communication paths in this multi-stage connection network, it is necessary to periodically conduct continuity tests. Therefore, in the past, detection circuits for detecting continuity test signals were connected to the output communication lines of the final stage switching network constituting the multi-stage connection network, respectively.
Based on the output signals from these detection circuits, the pass/fail of the continuity test is determined.

Next, a detailed explanation will be given with reference to FIG.

The figure shows a three-stage connection network in which switching networks 1, 2, and 3 are connected in cascade. The first-stage switching network 1 includes matrix switches 101 to 10K that selectively connect n input communication lines 401 to 4On and m output communication lines 501 to 50m, respectively.

The M switching networks 2 in the second stage have M switch stations,
``;l = 1'' Accommodate the output communication lines 501 to 50m of the switching network 1 with the same number as input communication lines, and select these input communication lines and y output communication lines 601 to 60y. Each of the Y switching networks 3 in the third stage connects the same numbered output communication arms 601 to 60Y of the M switching networks 2 to m inputs. Each of the matrix switches 301 to 30Y is provided as a communication line and selectively connects these input communication lines to g output communication lines 701 to 70g.

Gao, matrix switch 101~IOK, 201~2
0M, 301 to 30Y are space-divided matrix switches composed of mechanical switching elements or semiconductor switching elements.

When carrying out a continuity test of a multi-stage connection network configured in this way, the matrix switches 101-10 of the switching networks 1, 2.3 at each stage have 201-20M.

301 to 30Y are each selectively driven to form a switching point commonly referred to as a cross point. As a result, one communication path is set up. for example,
This communication path is the communication line 401-matrix switch 101
- Communication line 501 - Matrix switch 201 - Communication line 6
01-Matrix switch 301-If set by communication line 701, a continuity test signal is supplied to communication axis 401. This continuity test No. 1g is basically transmitted to the communication line 701 if the matrix switches 101, 201, and 301 in each stage of the switch are operating normally. This communication line 7
The continuity test signal appearing at 01 is output to the detection circuit 8 via the signal line 7. As a result, the detection circuit 8
A detection display signal (for example, a logical lightning 1 level signal) is outputted from the 17r detection circuit 9, and the 17r acquisition circuit 9 reads this signal. As a result,
The normality of the communication path just set is determined. At this time, if the reading circuit 9 is unable to receive the detection display signal for some reason, or if the detection display signal is received from the detection circuit 8 related to another communication path, it is determined that the test result is abnormal.

In addition, after restoring (opening) the set communication path, a continuity test signal is supplied to the communication line 401 of the matrix switch 101, and a detection display signal ( For example, the normality is determined by the reading circuit 9 reading the logic 10 I level signal.

[Problem that the invention seeks to solve]

However, in the continuity test of a multi-stage connection network as described above, a continuity test signal detection circuit is provided only for each output communication line of the final stage switching network, so it is necessary to set up and restore the communication path. Sometimes, even if an abnormal state is detected, it is not possible to immediately identify the location of the fault, that is, which switching point of the matrix switch in which stage the fault is.

This problem can be solved by providing detection circuits corresponding to the output communication lines of all stages of the switching network constituting the multi-stage connection network, but this will result in a significant increase in hardware. The circuit (K-m+M-y+y-g)
It is not economical because it requires several units.

[Means for solving problems]

The multi-stage connection network of the present invention includes switch-hanging means for selectively connecting a plurality of input communication lines and a plurality of output communication lines, and a continuity test signal appearing on the plurality of output communication lines. The continuity test is performed in the detection means of the switching network of each stage, and is configured by cascading a switching network including a selector means for outputting and a detection means for detecting the continuity test signal from the selector means. The present invention is characterized in that the continuity test is judged to be good or bad based on the detection state of the signal.

[Example] Next, an example of the present invention will be described with reference to the drawings.

Referring to FIG. 1, the multi-stage connection network of this embodiment includes a plurality of switching networks (lattice networks) 1, 2, and 3, respectively.
It consists of cascade connections. The first-stage switching network 1 is a matrix switch that selectively connects n input communication lines 401 to 40 fl and m output communication lines 501 to 50 m according to instructions from switch control circuits 111 to IIK, respectively. A selector (1/m selector) that selectively outputs continuity test signals connected to m output communication fFMs 501 to 5 Q m and appearing on these communication lines.
121-12 are provided. These selectors 121-1
2, a 1/m selection operation is performed according to instructions from the switch control circuits 111 to 11K, respectively. Furthermore, the switching network 1 includes detection circuits 131 to 13K that respectively detect continuity test signals output from the selectors 121 to 12K and output detection display signals to the signal line 5. The M switching networks 2 in the second stage accommodate the same numbered output communication lines 501 to 50m of the switching network 1 as input communication lines, and connect these input communication lines with y output communication lines. The lines 601 to 60y are connected to the switch control circuit 211, respectively.
Matrix switches 201 to 20M are selectively connected according to instructions from ~21M, and y output communication lines 60 respectively.
1 to 60y, and selectors (1/y selectors) 221 to 22M that selectively output continuity test signals appearing on these communication lines.

These selectors 221-22M perform a 1/y selection operation according to instructions from switch control circuits 211-21M, respectively. In addition, the switching network 2 has a selector 221
Detection circuit 231 that detects each of the continuity test signals output from ~22M and outputs a detection display signal to the signal line 6~
Equipped with 23M. Furthermore, one switching network 3 in the third stage has output communication lines 601 to 6 of M switching networks 2.
These input communication lines and g output communication lines 701 to 70 accommodate the same numbers of 0y as y input communication lines.
Matrix switches 301 to 3 selectively connect G and G according to instructions from switch control circuits 311 to 31Y, respectively.
0Y and selectors (1/g selectors) 321 to 3 connected to g output communication lines 701 to 70g and selectively outputting continuity test signals appearing on these communication lines.
2Y. These selectors 321-32Y perform a 1/g selection operation in response to instructions from switch control circuits 311-31Y, respectively.

Furthermore, the switching network 3 includes detection circuits 331 to 33Y that respectively detect continuity test signals output from the selectors 321 to 32Y and output detection display signals to the signal line 7. Here, matrix switches 101 to IOK, 20
Reference numerals 1 to 20M and 301 to 30Y are space-divided type MA) IJ switches similar to the conventional ones described above.

FIG. 1 also shows an example of a test circuit attached to conduct the continuity test of the multi-stage connection network described above, in which reference numeral 90 is a reading circuit for the detection display signal, and 91 and 92 are selectors (%). 93 is a continuity test signal generation circuit.

Next, a procedure for conducting a continuity test of the multi-stage connection network configured as described above will be explained. For example, communication line 4
0n- Matrix switch l0K of switching network 1
When conducting a continuity test on the communication path of communication line 501 - matrix switch 201 of switching network 2 - communication line 60y - matrix switch 30Y of switching network 3 - communication line 701, a predetermined continuity test signal is sent to the input/output circuit of the test equipment ( (not shown), this information is identified by a central controller (not shown). The central control unit first selects selectors 91, 92.12, 221. and transmits information for switching control of 32Y. As a result, the earth signal that has traced the selector 92 is supplied to the communication 140n of the matrix switch 10 via the selector 91. Also, selector 12K.

221 and 32Y are respectively switch control circuits 1
1, 211. The switching operation is performed under control from 31'Y and 31'Y. At this time, matrix switch 10K.

The switching points of 201 and 30Y are also set under control from the switch control circuit, and if the communication path is normal, the detection circuit 13, 231. and 33Y are all inactive with respect to the earth signal, so they do not output the detection display signal to the reading circuit 90. Subsequently, the selector 92 is connected to the continuity test signal generation circuit 93 under control from the central control device. Here, if the communication path is normal, the detection circuit 13 sends 231. and 33Y detect the continuity test signal and send the detection display signal to the signal line 5゜6.
, and 7 to the reading circuit 90.

If the reading circuit 90 cannot read the detection display signal from the signal line 7, the communication path 60y.

Switch of driven matrix switch 30Y - △1
It is possible to quickly determine that there is an abnormality in the communication point and the meridian of the communication channel 701. Similarly, continuity tests on other communication V paths can be sequentially performed. Note that the continuity test method described above is only an example, and other well-known methods may be used in combination. In the multi-stage connection network of the above embodiment, the number of detection circuits can be reduced to [K+M+Y]. on the other hand,
Although it is necessary to newly install a selector or the like in each switching network, this does not impair economic efficiency in any way compared to the conventional configuration in which a detection circuit is provided for each output communication line.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to provide a multi-stage connection network with an economical configuration that can quickly detect failure points in a continuity test.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. 1.2.3...Switching network, 101-10
K. 201-20M, 301-3 ('IY... Matrix switch, 121-12, 221-22M, 3
21-32Y...Selector, 131-13,
231~23M, 331~33 Y----detection circuit,
401-4 (lrl, 501-50m.

Claims (1)

[Claims] a switching means for selectively connecting a plurality of input communication lines and a plurality of output communication lines; a selector means for selectively outputting continuity test signals appearing on the plurality of output communication lines;
and detection means for detecting the continuity test signal from the selector means, the switching network is configured by cascading multiple stages, and the continuity is determined by the detection state of the continuity test signal in the detection means of the switching network in each stage. A multi-stage connection network characterized by allowing a test to be judged as good or bad.