JPH04247755A - Ordering line changeover system - Google Patents

Abstract

PURPOSE:To attain talking between a transmitter and a receiver and to prevent howling even when communication is disabled at one part of an ordering line by providing a specific line changeover system to an ordering line network. CONSTITUTION:A coupling means 300 superimposes a transmission signal from a relevant transmitter 3 onto reception signals reached from ordering lines 1 at both sides and sends the result to an opposite ordering line respectively via switch means 100,200. When the communication of one of the ordering lines is disabled, two sets of branch coupling circuits 5 connecting to the lines disconnects the communication disable line with the switch means 100, 200 and connects the other ordering line to the system thereby attaining the talking through the ordering line network entirely. Moreover, when all the ordering lines are normal, one ordering line of any of the branch coupling circuits 5 is disconnected to prevent occurrence of howling.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meeting line switching system in a meeting line network in which a plurality of transmitters and receivers are connected in a circular manner by a meeting line capable of communicating in both directions.

[0002] Maintenance and maintenance of a communication system in which a plurality of communication terminal stations are connected in a ring through transmission paths and each communication terminal station communicates with each other.
In order to conduct the test, each communication terminal station is equipped with a transmitter and receiver for meetings, and a meeting line network is established in which each transmitter and receiver are connected in a circular manner by a meeting line that allows communication in both directions. .

0003

2. Description of the Related Art FIG. 6 is a diagram showing an example of a conventional meeting line network. In FIG. 6, a meeting line 1 that can communicate in both directions is connected in a ring, and transmitters (T
) 3 and the receiver (R) 4 are connected to the branching and coupling circuit 2, respectively.
It is connected to meeting line 1 via.

[0004] Each branching/coupling circuit 2 sends a transmission signal sent from the corresponding transmitter (T) 3 to the meeting line 1. Each transmission signal sent from each branching/coupling circuit 2 is transmitted to all the branching/coupling circuits 2 via the meeting line 1.

[0005] Furthermore, each branching/coupling circuit 2 branches all outgoing signals transmitted via the meeting line 1 and transmits them to the corresponding receiver (R) 4.

[0006]

[Problems to be Solved by the Invention] As is clear from the above explanation, in a conventional meeting line network, each transmitter (T
) 3 is sent to the meeting line 1 which is connected in a ring by each branching and coupling circuit 2.
Since the transmitting signal is transmitted to each receiver (R) 4 via the transmitter, there is a problem in that the transmitting signal causes howling, making it difficult to make a telephone call.

In order to solve this problem, it is considered to disconnect the meeting line 1 connected in a ring at one point.
In such a state, if a failure occurs at any point on the meeting line 1 and communication becomes impossible, the meeting line 1 will be separated into two sections, and any transmitter (T) 3 and receiver (R) 4 will be disconnected. It becomes impossible to make a meeting call between each other, and it no longer plays the role of a meeting line network.

[0008] The present invention makes it possible to carry out a meeting call between all transmitters and receivers, and to prevent howling from occurring, even if communication becomes impossible at any point on the meeting line. The purpose is to configure a meeting line network.

[0009]

Means for Solving the Problems FIG. 1 is a diagram showing the principle of the present invention. In FIG. 1, 1 is a meeting line that can communicate in both directions, 3 is a transmitter, and 4 is a receiver.

Reference numeral 5 denotes a branching/coupling switching circuit provided corresponding to each transmitter 3 and receiver 4 according to the present invention. 1
00 and 200 are opening/closing means provided in each branch coupling switching circuit 5 according to the present invention.

Reference numeral 300 denotes coupling means provided in each branch coupling switching circuit 5 according to the present invention. Reference numeral 400 denotes branching means provided in each branching/coupling switching circuit 5 according to the present invention. The meeting line 1 cascades each branching/coupling switching circuit 5 in a circular manner.

0012

[Operation] The opening/closing means 100 and 200 connect and disconnect the meeting line 1 connected to the branch coupling switching circuits 5 on both sides adjacent to each other.

[0013] The coupling means 300 is connected to the corresponding transmitter 3.
The transmitting signal sent from the terminal is superimposed on the receiving signal arriving from the meeting lines 1 on both sides, and is sent to the meeting lines 1 on the opposite side via the opening/closing means 100 and 200, respectively.

The branching means 400 transfers the receiving signals arriving from the meeting lines 1 on both sides to the meeting lines 1 on the opposite side, and branches the receiving signals to the corresponding handsets 4.
to communicate.

Note that the opening/closing means 100 and 200 disconnect one meeting line 1 and switch the other meeting line 1 in any one of the branching/coupling switching circuits 5 when all meeting lines 1 can communicate normally. The meeting line 1 is connected, and in all other branching/coupling switching circuits 5, the meeting lines 1 on both sides are connected.

Furthermore, when one of the meeting lines 1 is unable to communicate, the opening/closing means 100 and 200 are connected to each other in the two sets of branching/coupling switching circuits 5 connected by the meeting line 1 that has become unable to communicate. The meeting line 1 that has become disabled is disconnected and the other meeting line 1 is connected, and in all other branching/coupling switching circuits 5, the meeting lines 1 on both sides are connected.

[0017] Therefore, even if the meeting line connecting all the branch-coupling switching circuits is normal, howling will not occur because the annular connection is disconnected by the opening/closing means of a certain branch-coupling switching circuit. In addition, even if any of the meeting lines become unable to communicate, all the branching and coupling switching circuits will be interconnected by the meeting line, and it will be possible to fulfill the role of the meeting line network. becomes.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a meeting line network according to an embodiment of the present invention, FIG. 3 is a diagram showing an example of a branching and coupling switching circuit in FIG. 2, and FIG. 4 is a diagram showing an example of a normal call state in FIG. 2. FIG. 5 is a diagram showing an example of a switched call state in FIG. 2. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, branch-coupling switching circuits 5 are provided corresponding to four sets of transmitters (T) 3 and receivers (R) 4, and four sets of branch-coupling switching circuits 5 are provided. are connected in cascade in a circular manner by a meeting line 1, respectively.

The individual branch-coupling switching circuits are referred to as 51 to 54, and the meeting line connecting branch-coupling switching circuit 51 and branch-coupling switching circuit 52 is referred to as 112, and the same applies hereinafter. Each meeting line 1 is constructed of a four-wire system capable of bidirectional communication.

Each branch coupling switching circuit 5 has the configuration shown in FIG. 3, and the opening/closing means 10 in FIG.
Switches 51 and 52 are provided as 0, and FIG.
Switches 53 and 54 as opening/closing means 200 in
Further, as the coupling means 300 in FIG. 1, coupling circuits 55 and 56 and a branch circuit 58 are provided, and as the branching means 400 in FIG. 1, a coupling circuit 57 and branch circuits 59 and 50 are provided.

The connection state between each branching and coupling switching circuit 5 and the meeting line 1, the transmitter (T) 3 and the receiver (R) 4 will be explained using the branching and coupling switching circuit 51 as an example.
and 521 is an adjacent branch-coupling switching circuit 54.
A meeting line 141 is connected to the switches 531 and 541, and a meeting line 112 is connected to the adjacent branch coupling switching circuit 52.
Further, the transmitter (T) 31 is connected to a branch circuit 581, and the receiver (R) 41 is further connected to a coupling circuit 571.

The switches 511 and 521 are set to a conductive state when the switching signal SL is set to a logic "0", and are set to a cutoff state when the switching signal SL is set to a logic "1". set and also switch 5
31 and 541 are set to a conductive state when the switching signal SR is set to logic "0", and set to a cut-off state when the switching signal SR is set to logic "1".

When all the meeting lines 1 can communicate normally, the switching signal SL in a certain branching/coupling switching circuit (for example, the branching/coupling switching circuit 51) is logic "1" and the switching signal SR is logic "1". The switching signals SL and SR in the other branch-coupling switching circuits 52 to 54 are both set to logic "0".

Therefore, the switch 5 of each branch-coupling switching circuit 5
1 to 54, as shown in FIG. 4, only the switches 511 and 521 in the branch-coupling switching circuit 51 are set to the cut-off state, and the switches 531 and 541 in the branch-coupling switching circuit 51 and the other branch-coupling switching circuits 52 to 54 are set to the cut-off state. 54 switches 512 to 544 are all set to a conductive state.

In this state, the transmitting signal sent from the transmitter (T) 31 is transmitted to the switch 511 via the branch circuit 581 and the coupling circuit 551 in the branch coupling switching circuit 51. 511 is set to the cut-off state, it is not transmitted to the meeting line 141, but it is transmitted from the branch circuit 581 to the coupling circuit 561.
, the switch 531 and the right communication path of the meeting line 112 to the branch coupling switching circuit 52 , the switch 522 , the branch circuit 592 and the coupling circuit 572 .
is transmitted to the receiver (R) 42 via
From the branch circuit 592 to the coupling circuit 562 and the switch 53
2 and the right communication path of the meeting line 123, and is transmitted to the branching and coupling switching circuit 53, and the switch 523,
It is transmitted to the handset (R) 43 via the branch circuit 593 and the coupling circuit 573, and the branch circuit 593
The signal is transmitted from the coupling circuit 563 , the switch 533 , and the right communication path of the meeting line 134 to the branch coupling switching circuit 54 , the switch 524 , and the branch circuit 594 .
and the receiver (R) 44 via the coupling circuit 574.
At the same time, it is transmitted from the branch circuit 594 to the branch coupling switching circuit 51 via the coupling circuit 564, the switch 534, and the left communication path of the meeting line 141, but when the switch 521 is set to the cutoff state. Therefore, the handset (R) 4 is connected via the branch/coupling switching circuit 51.
1 and the meeting line 112.

Further, the transmitting signal sent from the transmitter (T) 32 is sent to a branch circuit 582 in the branch/coupling switching circuit 52.
, the coupling circuit 552 , the switch 512 , and the branch coupling switching circuit 5 via the left communication path of the meeting line 112 .
1, and is also transmitted from the branch circuit 582 to the branch coupling switching circuit 53 via the right communication path of the coupling circuit 562, the switch 532, and the meeting line 123, and the signal is transmitted to the branch coupling switching circuit 53. It is transmitted to the receiver (R) 43 via the branch circuit 593, the switch 533, and the right communication path of the meeting line 134 to the branch coupling switching circuit 54. , to the receiver (R) 44 via the branch circuit 594 and the coupling circuit 574, and from the branch circuit 594 to the coupling circuit 564 and the switch 53.
4 and the left communication path of the meeting line 141 to the branching/coupling switching circuit 51, but the switch 521
Since the is set to the cut-off state, the branch coupling switching circuit 5
The transmission signal of the transmitter (T) 32 is not transmitted to the receiver (R) 41 via the communication line 112, but is transmitted to the branching and coupling switching circuit 51 via the left communication path of the meeting line 112. , the switch 541 , the branch circuit 501 and the coupling circuit 571 to the receiver (R) 41 , and from the branch circuit 501 to the coupling circuit 551 to the switch 511 .
1 is set to a blocked state, it will not be transmitted to the meeting line 141.

Further, the transmitting signal sent from the transmitter (T) 33 is sent to a branch circuit 583 in the branch/coupling switching circuit 53.
, the coupling circuit 563, the switch 533, and the branch coupling switching circuit 5 via the right communication path of the meeting line 134.
4, and is also transmitted from the branch circuit 583 to the branch coupling switching circuit 52 via the left communication path of the coupling circuit 553, the switch 513, and the meeting line 123, and the signal is transmitted to the branch coupling switching circuit 52. It is transmitted to the receiver (R) 42 via the branch circuit 502 , the switch 512 , and the left communication path of the meeting line 112 to the branch coupling switching circuit 51 . , is transmitted to the handset (R) 41 via the branch circuit 501 and the coupling circuit 571, and is also transmitted from the branch circuit 501 to the switch 511 via the coupling circuit 551, but when the switch 511 is set to the cut-off state. Therefore, the transmitter (T) 33 is not sent to the meeting line 141, but is transmitted to the branching and coupling switching circuit 54 via the right communication path of the meeting line 134.
The transmission signal is transmitted to the receiver (R) 44 via the switch 524 , the branch circuit 594 , and the coupling circuit 574 , and is also transmitted from the branch circuit 594 to the coupling circuit 564 , the switch 534 , and the left direction of the meeting line 141 . The signal is transmitted to the branch/coupling switching circuit 51 via the communication path, but since the switch 521 is set to the cutoff state, the signal is transmitted to the receiver (R) 4 via the branching/coupling switching circuit 51.
1 and the meeting line 112.

Furthermore, the transmitting signal sent from the transmitter (T) 34 is sent to a branch circuit 584 in the branch/coupling switching circuit 54.
It is transmitted to the branch coupling switching circuit 51 via the left communication path of the coupling circuit 564, switch 534, and meeting line 141, and is transmitted from the branch circuit 584 to the coupling circuit 554, switch 514, and meeting line 13.
The signal is transmitted to the receiver (R) 43 via the left communication path of 4, and is transmitted to the receiver (R) 43 via the switch 543, the branch circuit 503, and the coupling circuit 573, and from the branch circuit 503 to the coupling circuit. 553
, the switch 513 and the left communication path of the meeting line 123 to the branch coupling switching circuit 52 , the switch 542 , the branch circuit 502 and the coupling circuit 572 .
is transmitted to the receiver (R) 42 via
From the branch circuit 502 to the coupling circuit 552 and the switch 51
2 and the left communication path of the meeting line 112 to the branching and coupling switching circuit 51, and the switch 541,
It is transmitted to the receiver (R) 41 via the branch circuit 501 and the coupling circuit 571, and the branch circuit 501
The signal is transmitted to the switch 511 via the coupling circuit 551, but is not sent to the meeting line 141 because the switch 521 is set to the cutoff state.

On the other hand, the transmitter (T
Since the switch 521 is in the cutoff state, the transmitting signal of ) 34 is sent to the receiver (R
) 41 and the meeting line 112.

As is clear from the above explanation, in the normal conversation state shown in FIG. However, the switch 5 in the branch-coupling switching circuit 51
11 and 521 are set to the cut-off state, so there is no risk of howling occurring.

Next, when a failure occurs in the meeting line 123 connecting the branching and coupling switching circuits 52 and 53 and communication becomes impossible, the switching signal SR in the branching and coupling switching circuit 52 and the branching and coupling switching The switching signal SL in the circuit 53 is set to logic "1", the switching signal SL in the branching and coupling switching circuit 52 is set to logic "0", and the switching signal SL in the branching and coupling switching circuit 52 is set to logic "0", and the switching signal SL in the branching and coupling switching circuit 52 is set to logic "0". Switching signals SL and SR at and 54 are both set to logic "0".

Therefore, the switch 5 of each branch-coupling switching circuit 5
1 to 54, as shown in FIG. 5, only the switches 532 and 542 in the branching and coupling switching circuit 52 and the switches 513 and 523 in the branching and coupling switching circuit 53 are set to the cutoff state, and the switch 512 in the branching and coupling switching circuit 52 is set to the cut-off state. and 522,
Switches 533 and 543 in branch-coupling switching circuit 53 and branch-coupling switching circuits 51 and 54
The switches 511 to 541 and 514 to 544 are set to conductive states.

In this state, the transmitting signal sent from the transmitter (T) 31 is transmitted to the branch circuit 581, the coupling circuit 561, the switch 531 in the branch coupling switching circuit 51, and the right communication path of the meeting line 112. is transmitted to the branch coupling switching circuit 52 via the branch circuit 581.
From the coupling circuit 551, the switch 511, and the right communication path of the meeting line 141 to the branch coupling switching circuit 5.
4, the switch 544, and the branch circuit 504.
and the receiver (R) 44 via the coupling circuit 574.
from the branch circuit 504 to the coupling circuit 5.
54, the signal is transmitted to the branch/coupling switching circuit 53 via the switch 514 and the left communication path of the meeting line 134, and is transmitted to the receiver (R) 43 via the switch 543, the branch circuit 503, and the coupling circuit 573. At the same time, the signal is transmitted from the branch circuit 503 to the switch 513 via the coupling circuit 553.
is set to the cut-off state, so it is not transmitted to the meeting line 123, but the transmitter (
The transmission signal of T) 31 is transmitted to the receiver (R
) 42 and is also transmitted from the branch circuit 592 to the switch 532 via the coupling circuit 562, but since the switch 532 is set to the cutoff state, it is not sent to the meeting line 123.

Further, the transmitting signal sent from the transmitter (T) 32 is sent to a branch circuit 582 in the branch/coupling switching circuit 52.
and a switch 532 via a coupling circuit 562.
However, since the switch 532 is set to the cutoff state, it is not sent to the meeting line 123, but it is transmitted from the branch circuit 582 to the coupling circuit 552 to the switch 5.
12 and the left communication path of the meeting line 112 to the branch/coupling switching circuit 51 , and the switch 541
, is transmitted to the handset (R) 41 via the branch circuit 501 and the coupling circuit 571, and the branch circuit 50
1 to the branch coupling switching circuit 54 via the coupling circuit 551, the switch 511, and the right communication path of the meeting line 141.
4 and the receiver (R) 4 via the coupling circuit 574.
4, and is also transmitted from the branch circuit 504 to the branch coupling switching circuit 53 via the left communication path of the coupling circuit 554, the switch 514, and the meeting line 134, and the signal is transmitted from the branch circuit 504 to the branch coupling switching circuit 53. It is transmitted to the receiver (R) 43 via the branch circuit 503 and to the switch 513 via the coupling circuit 553, but the switch 51
3 is set to a blocked state, it will not be sent to the meeting line 123.

Further, the transmitting signal sent from the transmitter (T) 33 is sent to a branch circuit 583 in the branch/coupling switching circuit 53.
and the switch 513 via the coupling circuit 553.
However, since the switch 513 is set to the cutoff state, it is not sent to the meeting line 123, but it is transmitted from the branch circuit 583 to the coupling circuit 563 to the switch 5.
33 and the right communication path of the meeting line 134 to the branch coupling switching circuit 54, and the switch 524
, is transmitted to the receiver (R) 44 via the branch circuit 594 and the coupling circuit 574, and the branch circuit 59
4 to the branch coupling switching circuit 51 via the coupling circuit 564, the switch 534, and the left communication path of the meeting line 141.
1 and the receiver (R) 4 via the coupling circuit 571.
1, and is also transmitted from the branch circuit 591 to the branch coupling switching circuit 52 via the coupling circuit 561, the switch 531, and the right communication path of the meeting line 112, and is transmitted to the branch coupling switching circuit 52. It is transmitted to the receiver (R) 42 via the branch circuit 592 and to the switch 532 via the coupling circuit 562, but the switch 53
2 is set to a blocked state, it will not be sent to the meeting line 123.

Furthermore, the transmitting signal sent from the transmitter (T) 34 is sent to a branch circuit 584 in the branch/coupling switching circuit 54.
, the coupling circuit 554, the switch 514, and the branch coupling switching circuit 5 via the left communication path of the meeting line 134.
At the same time, it is transmitted from the branch circuit 584 to the branch coupling switching circuit 51 via the left communication path of the coupling circuit 564, the switch 534, and the meeting line 141, and the switch 521, the branch circuit 591, and the coupling circuit 571. It is transmitted to the receiver (R) 41 via the branch circuit 591 , the switch 531 , and the right communication path of the meeting line 112 to the branch coupling switching circuit 52 . , is transmitted to the handset (R) 42 via the branch circuit 592 and the coupling circuit 572, and is also transmitted from the branch circuit 592 via the coupling circuit 562 to the switch 532, but the switch 532 is set to the cut-off state. Therefore, the transmitter (T) 3 is not transmitted to the meeting line 123, but is transmitted to the branching and coupling switching circuit 53 via the left communication path of the meeting line 134.
The transmission signal of No. 4 is sent to the switch 543 and the branch circuit 503.
and the receiver (R) 43 via the coupling circuit 573.
It is also transmitted from the branch circuit 503 to the switch 513 via the coupling circuit 553.
Since the switch 513 is set to the cutoff state, the message is not sent to the meeting line 123.

As is clear from the above description, in the switched call state shown in FIG.
switches 532 and 542 in the switch circuit 53 and switches 513 and 5 in the branch-coupling switching circuit 53
23 is set to be cut off, the meeting line 123, which is unable to communicate, is disconnected, and each transmitter (
The transmitting signal sent from T) 3 is transmitted to all other handsets (
R) 4, and the role of the ring meeting line network is fulfilled.

It should be noted that FIGS. 2 to 5 are only one embodiment of the present invention.
It is not limited to what occurs in the meeting line 123 that connects and 53, and may occur in other meeting lines 1, but the effects of the present invention remain the same in either case. . Further, the transmitter (T) 3 and the receiver (R) 4 are not limited to four sets each, and many other modifications may be considered, but the effects of the present invention will not be affected in any case. does not change. Furthermore, the configuration of each branch-coupling switching circuit 5 is not limited to that shown in the drawings, and many other modifications may be considered, but the effects of the present invention remain the same in any case.

[0040]

As described above, according to the present invention, in the meeting line network, even when the meeting lines connecting all the branching and coupling switching circuits are normal, the opening/closing means of a certain branching and coupling switching circuit Howling does not occur because the ring connection is disconnected, and even if one of the meeting lines becomes unable to communicate, all branching and coupling switching circuits are connected to each other by the meeting line. Therefore, it becomes possible to play the role of the meeting line network.

[Brief explanation of the drawing]

[Figure 1] Diagram showing the principle of the present invention

[Fig. 2] A diagram showing a meeting line network according to an embodiment of the present invention.

[Figure 3] Diagram showing an example of the branch-coupling switching circuit in Figure 2

[Figure 4] A diagram showing an example of a normal call state in Figure 2

[Figure 5] A diagram showing an example of a switched call state in Figure 2.

[Figure 6] Diagram showing an example of a conventional meeting line network

[Explanation of symbols]

1 Meeting line 2 Branch coupling circuit 3. Transmitter (T) 4 Handset (R) 5 Branch coupling switching circuit 51, 52, 53, 54 switch 55, 56, 57 Combined circuit 58, 59, 50 Branch circuit 100, 200 Opening/closing means 300 Coupling means 400 Branching means

Claims (3)

[Claims] Claim 1: In a conference line network in which a plurality of transmitters (3) and handsets (4) communicate via a conference line (1) capable of communicating in both directions, each of the transmitters (3)
A branching and coupling switching circuit (5) is provided corresponding to each of the branching and coupling switching circuits (5) and the telephone receiver (4), and each of the branching and coupling switching circuits (5) is cascaded in a ring shape by the meeting line (1). (5), opening/closing means (100, 200) for connecting and disconnecting the meeting line (1) connected to the branching/coupling switching circuits (5) on both adjacent sides, and the corresponding transmitter (3). The transmitted transmission signal is superimposed on the reception signal arriving from the meeting lines (1) on both sides, and the opening/closing means (
100, 200) to the meeting line (1) on the opposite side, respectively, and a coupling means (300) that sends the reception signal arriving from the meeting line (1) on both sides to the meeting line (1) on the opposite side, respectively. A meeting line switching system characterized by being provided with branching means (400) for transferring the received call signal to the meeting line (1) and branching the received call signal and transmitting it to the corresponding handset (4). 2. The opening/closing means (100, 200) comprises:
If all the meeting lines (1) can communicate normally,
In any one of the branching and coupling switching circuits (5), one of the meeting lines (1) is disconnected, and the other meeting line (1) is disconnected.
1) and all other branch coupling switching circuits (5)
2. The meeting line switching system according to claim 1, wherein the meeting lines (1) on both sides are connected. 3. The opening/closing means (100, 200) comprises:
When one of the meeting lines (1) is unable to communicate, the two sets of branch coupling switching circuits (5) connected by the meeting line (1) that has become unable to communicate, respectively Disconnect the meeting line (1) that has become disconnected, connect the other meeting line (1), and connect the meeting lines (1) on both sides in all other branching and coupling switching circuits (5). The meeting line switching system according to claim 1, characterized in that: