JPH10303959A - Order wire semiautomatic switching system at time of ring construction in sdh network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent howling and echo with order wire that communicates voice information between devices by detecting order wire information that is sent from self-station and preventing a loop structure. SOLUTION: When a DET1 (21) of an originating source node 10 detects a call to a 1st signal line A, a SW1 (31) is disconnected to prevent the line A from becoming a loop structure. On the other hand, when the mode 10 does not detect it, the SW1 (31) is kept connected. When a DET2 (22) of the node 10 detects a call to a 2nd signal line B which is the opposite direction to the line A, when the SW1 (31) of the line A is in a disconnected state, idle information is sent to the line B and when the SW1 (31) of the line A is in a connected state, a SW2 (32) of the line B is turned to a disconnected state. When the DET2 (22) of the node 10 does not detect a call to the line B, the SW2 (32) of the line B is kept connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an order wire system for a transmission line having a ring structure, and more particularly to an SDH (Synch) system.
hronous Digital Hierarchy (Synchronous Digital Hierarchy) The present invention relates to an order wire method used for a ring-type network.

[0002]

2. Description of the Related Art As a well-known document of an order wire control method for a ring type network, for example, (1) Japanese Patent Application Laid-Open No. 4-96499 discloses that when a selector receives an audio signal addressed to its own station, it passes or inhibits it. There has been proposed a meeting method using a meeting line of a ring network in which a normal meeting can be performed by prohibiting the passage of an audio signal taken in by a unit.

[0003] Also, (2) Japanese Patent Application Laid-Open No. 4-284,752 discloses an order-wire system used for system line maintenance or the like in a ring configuration having an optical add-drop multiplexing device. The order wire system is equipped with a howling prevention unit that prevents howling that occurs between the transmitted signal and the signal that goes around the ring, prevents howling caused by the sound transmitted from the station, and enables the use of the order wire even when the optical fiber is disconnected. Proposed.

In a network composed of a plurality of SDH transmission devices, for network line maintenance,
It has an order wire for communicating voice information. However, when the network has a ring-like configuration, the order wire also forms a loop, and the sound transmitted from the own station makes a round, causing a problem such as howling or echo.

For this reason, it has been necessary to make settings such as manual cutting so that the order wire does not form a loop configuration.

Further, even when a failure occurs, it is necessary to manually change the cutting point of the order wire.

[0007] A conventional system will be described with reference to FIG. In FIG. 6, the number of devices is four, and node A (1
0), B (11), C (12), and D (13) in the ring network, disconnecting node A (10) -node D (13) or transmitting idle (empty) information, Settings have been made that do not constitute a loop. With this setting, it is possible to exchange order wire information from any station.

Also, for example, node C (12) -node D
If a line failure occurs between (13), in the state of FIG. 6, it is impossible to exchange information from the node D to any station, so as shown in FIG. )
-It is necessary to release the disconnection between the nodes D (13).

[0009]

As described above, in the conventional method, setting work such as manual cutting is required so that the order wire does not form a loop configuration.

In the event of a line failure, it is necessary to change the disconnection point once set.

As a practical problem, when these stations are far apart, it is very inefficient for an operator to go to the site for setting changes such as changing the cutting point.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide an order wire system which automatically sets an order wire cutting point while avoiding manual setting. It is in.

[0013]

In order to achieve the above object, the present invention provides a plurality of SDHs (Synchronous Digital Hierarchy).
(Erarchy) In a network configuration in which transmission devices are arranged in a ring, each of the devices detects order wire information transmitted by its own station, and order wire cutting means for preventing the order wires from forming a loop configuration. And have. This allows
Howling and echo are prevented by an order wire for communicating audio information between devices.

Further, the present invention is characterized in that even when a line failure occurs, disconnection can be set according to the failure state.

[0015]

Embodiments of the present invention will be described. In the embodiment of the present invention, each device (node) on the ring network is provided with an ID (identifier) for order wire, and calls this ID when starting communication.

The called ID is transmitted over the order wire, passes through the communication destination, and returns to the source device. The source device monitors the order wire information (detection function),
Before returning the called information, a switch (SW1) for automatically disconnecting the order wire is provided (disconnection function).

In the embodiment of the present invention, each node comprises a detecting means for detecting when the order wire information transmitted from the own device returns to the own device after making a round on the network, and the detecting means detects the order wire information. And switch means for disconnecting the signal line when the return of the information is detected so that the order wire does not form a loop configuration, and means for detecting a call to the first signal line (A) by the source node detection means ( When the detection is performed by DET1) in FIG. 1, the first signal line (A) is set so that the first signal line does not have a loop configuration.
The switch means (SW1 in FIG. 1) is turned off. On the other hand, when no detection is made, the switch means (SW1) of the first signal line is kept connected and the first signal line is switched off. When the call to the signal line (B) No. 2 is detected by the detecting means (DET2 in FIG. 1) of the originating node, when the switch means of the first signal line is disconnected, the idle information When the switch means of the first signal line is in the connected state, the switch means (SW2 in FIG. 1) of the second signal line (B) is turned off, and the call to the second signal line is made. When the detection is not performed by the detection unit of the transmission source device, the switch unit (SW2) of the second signal line is kept connected,
And

In the embodiment of the present invention, if a line failure occurs in any part of the ring network, it is possible to automatically change the setting of the disconnection point according to the line failure.

As described above, according to the embodiment of the present invention, it is possible to automatically set a cutting point without performing manual switching.

[0020]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of one embodiment of the present invention. Referring to FIG. 1, this ring network is:
Nodes A (10), B (11), C (12), D (1
And 3). Although FIG. 1 shows four nodes for ease of description, it is needless to say that the number of nodes is not limited to four in the present invention. Also, since each node has the same configuration, FIG. 1 shows only the internal configuration of node A (10).

The node A (10) will be described. In the node A (10), the signal lines 21 and 22
(1), first and second detectors DET1, DET2, 31, 3 for detecting call information returned to the own station of B (2)
Reference numeral 2 denotes first and second switches (cutting portions) SW1 and SW2, and reference numerals 41, 42, and 43 denote digital branches DB1,
DB2, DB3, and DB4 are mechanisms that combine two pieces of input speech information into one. Node A of other node
The configuration is the same as that of (10). In this embodiment, each node is provided with an order wire ID (identifier), and this ID is called when starting communication.
The called ID passes through the order wire via the order wire and returns to the source device. The detector detects this and turns off the switch.

First, it is assumed that all the nodes are connected in the initial state. In this state, the setting of the cutting point can be automatically performed according to the sequence of FIG. The operation of the node A (10) will be described for each state according to the sequence shown in FIG. FIG.
FIG. 5 is a diagram for explaining an operation sequence according to an embodiment of the present invention.

First, referring to FIG. 2, a state in which there is no fault will be described.

Sequence 1: For example, a call is made from the node A (10) to the node B (11) using the signal line A (1).

Sequence 2: The called information passes through the order wire, passes through the nodes C (12) and D (13), and finally returns to the source node A (10). Then, the first detector DET1 (21) detects the call information output by itself.

Sequence 3: First switch SW1 (3) so that the order wire does not form a loop at that time.
1) is controlled and cut off, and the signal line A (1) between the node A (10) and the node D (13) is cut off so as not to form a loop.

Sequence 4: signal line B (2) to the opposite side
Similarly, a call is made to the node B (11). That is, node D (13) → node C (12) → node B
Make a call via (11).

Sequence 5: As in the case of the signal line A (1), the flow returns to the source node A (10). Second
Detector DET2 (22) detects the call information output by itself.

Sequence 7: Since the first switch SW1 (31) is turned off in Sequence 3 (see Sequence 6), idle (empty) information is transmitted from DB3 (43) to the signal line B (2). Send out.

Sequence 8: With the above settings, the configuration of the order wire is completed.

With this configuration, the signal from the node A (10) to the node B (11) passes through the signal line A (1) and is
From (11) to the node A (10), the mutual transmission of voice becomes possible through the signal line B (2).

Sequence 9-10: When communication is completed,
Restore all settings to their original state.

In this embodiment, since all signals are kept connected in the communication state and a loop is formed, the loop gain is set to a negative value.

Next, the following three states will be described with reference to the sequence shown in FIG. In the following, differences from the case where there is no failure described above will be described.

FIG. 3 shows a case where the signal line A (1) is disconnected, which is indicated by a fault A (100) in the figure. There is no response from the signal line A (1),
In sequence 2, the first detector DET at the source
Since the call in 1 (21) cannot be detected, in the sequence 3, the first switch SW1 (31) is kept connected.

When there is a response from the signal line B (2) to the call to the signal line B (2) in the sequence 4, since the first switch SW1 (31) is not disconnected in the sequence 6, the sequence At 7, the second switch SW2 (32) is turned off.

FIG. 4 shows a case where the signal line B (2) is cut off, which is indicated by a fault B (101) in the figure.

In response to the call to signal line A (1) in sequence 1, there is a response from signal line A (1).
(31) is disconnected, and the call to the signal line B (2) in the sequence 4 is caused by the failure B (101).
Since there is no response from (2), sequence 6
Then, the second switch SW2 (32) is kept connected.

FIG. 5 shows a signal line A (1) and a signal line B (2).
, The fault A (100), the fault B
(100) has occurred.

Since there is no response from the signal line A (1) to the call to the signal line A (1) in the sequence 1, in the sequence 3, the first switch SW1 (3
1) remains connected, and no response is made from the signal line B (2) to the call to the signal line B (2).
(32) is kept connected. In this case, calls can be made from any node to each node on the network.

As described above, the present embodiment is configured as a network including a mechanism for detecting a call originated by the own station and a node having a disconnection unit for disconnecting the connection when the call is detected. Therefore, as described above, the setting of the cutting point can be automatically changed. Further, even when a failure occurs, the setting can be similarly performed without being conscious of the failure.

[0042]

As described above, according to the present invention,
A ring network consisting of a mechanism that detects a call originated by the local station and a node that has a disconnection unit that disconnects the call when the call is detected makes it possible to automatically prevent overwire howling echo. In this case, the setting of the cutting point can be changed. Further, according to the present invention, even when a failure occurs, the setting can be automatically changed without being conscious of the failure.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing an operation sequence of one embodiment of the present invention.

FIG. 3 is a diagram for explaining one embodiment of the present invention;
FIG. 11 is a diagram illustrating a failure A (100) as an operation explanation 1 in a failure example.

FIG. 4 is a diagram for explaining one embodiment of the present invention;
FIG. 9 is a diagram illustrating a failure B (101) as an operation explanation 2 in the failure example.

FIG. 5 is a diagram for explaining one embodiment of the present invention;
As operation description 3 in the failure example, failure A (100),
It is a figure which shows the fault B (101).

FIG. 6 is a diagram for explaining a conventional order wire method.

FIG. 7 is a diagram for explaining a failure time in the conventional order wire method.

[Explanation of symbols]

 Reference Signs List 1 signal line A 2 signal line B 10 node A 11 node B 12 node C 13 node D 21 first detector DET1 22 second detector DET2 31 first switch SW1 32 second switch SW2 41 digital branch DB1 42 Digital branch DB2 43 Digital branch DB3 OW Order wire 100 Failure A 101 Failure B

Claims (4)

[Claims] A plurality of SDHs (Synchronous Digital Hi
erarchy) In a network configuration in which transmission devices are arranged in a ring, as a functional means for preventing howling and echoing on an order wire for communicating voice information between the devices, each of the transmission devices includes: An order wire control method, comprising: means for detecting the order wire information sent by the order wire; and order wire cutting means for setting the order wire so as not to form a loop configuration. 2. The order wire control system according to claim 1, wherein a disconnection can be set in accordance with the state of the failure even when a line failure occurs. 3. A plurality of SDHs (Synchronous Digital Hi
erarchy) In a network configuration in which transmission devices are arranged in a ring, each transmission device detects when order wire information transmitted by its own device returns to its own device after making a round on the network. An order wire control method, comprising: a detecting unit that performs a signal line disconnection so that the order wire does not form a loop configuration when the detecting unit detects that the order wire information has returned. 4. A plurality of SDHs (Synchronous Digital Hi
erarchy) In a network configuration in which transmission devices are arranged in a ring, each transmission device detects when order wire information transmitted by its own device returns to its own device after making a round on the network. And a switch for disconnecting the signal line so that the order wire does not form a loop when the return of the order wire information is detected by the detecting unit, the call to the first signal line being provided. Is detected by the detection unit of the transmission source device, the switch unit of the first signal line is turned off so that the first signal line does not form a loop configuration. The switch means of the first signal line is kept in a connected state, and a call to the second signal line in the opposite direction to the first signal line is sent to the source transmission device. When the switch means of the first signal line is in the disconnected state, idle information is transmitted to the second signal line, and when the switch means of the first signal line is in the connected state, When the switch means of the second signal line is turned off, and the call to the second signal line is not detected by the detection means of the source transmission device, the switch means of the second signal line is connected. An order wire control method characterized by being left as it is.