JP2679679B2 - Orderwire communication control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an order wire (OW) communication control method in an interlocking system, and more particularly to switching of OW communication when a failure occurs in the interlocking ring system.

[0002]

2. Description of the Related Art Generally, in a ring system, when a communication failure occurs, a main signal disconnection is detected for a main signal line and a line overhead (Line O
K1 and K2 bytes (byte)
The main signal rescue protocol (hereinafter referred to as the APS protocol) using the above is used to automatically rescue the line.

On the other hand, in OW communication in which a call is made with another station using the order wire Byte in Overhead, the communication path is terminated in order to prevent howling caused by communication contents circulating on the network. Need to let. Therefore, it is necessary to secure the communication route and the termination point in order to restore the OW communication against the failure on the network.

By the way, in the case of OW communication, there is no control means for automatically recovering from a failure, and when a transmission path failure occurs, the terminal points on the network up to then (before the failure) are reconnected by manual control. There must be.

Referring now to FIG. 1, a single ring system (RING A and RING B) is a main node (Primary-Node (Pri-Node))
(P) and a secondary node (Secondary-Node (S)
ec-Node)) (S), the interlocking ring system connected at two points (in FIG. 1,
RING A has nodes N1 to N4, and RI
NG B includes nodes N5 to N8. And
Nodes N4 and N7 are Pri-Nodes, and nodes N3 and N8 are Sec-Nodes.) When attempting OW communication across rings, connection control becomes more complicated in the conventional connection control. Are known. And in such a system configuration, 2
It is necessary to set a route that does not circulate between the two rings, and control is required so that the route can be quickly set again even when a failure occurs.

[0006]

As described above, in the conventional connection control, when the OW communication straddling between the rings is attempted, not only the connection control becomes complicated but also 2
The non-paying route setting that connects the two rings becomes complicated. Further, there is a problem that it is difficult to reset the route when a failure occurs.

It is an object of the present invention to provide an OW communication control system capable of easily and appropriately restoring OW communication in an interlocking ring system in which two different single ring network systems are connected by two nodes. .

[0008]

In order to provide the above-mentioned control method, an APS protocol used for detecting a main signal loss and repairing a main signal communication is used to identify a failure point in a single ring. The detection of the main signal loss due to the line failure is used to identify the failure point between the rings. After specifying the failure point, termination control at the Node before and after the specified failure,
Primary-Node / S according to the location of failure
It has means for ensuring a new OW communication route by combining termination control and connection control of economy-Node.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

Generally, the APS protocol for rescue of the main signal uses 2 bytes of K1 and K2 called APS bytes, and K1 is a request level (Requests).
"condition (Condition) indicating the function of
n) ”and“ Destination Node ID (Destination Node) indicating the opposite station NodeID (identification code)
ID) ”. The K2 byte is a“ source node ID (Source Node I) indicating the own Node ID.
D) ".

In a normal state, a K1 byte Cond
The edition is NR (No Request) and is transmitted from each Node to both opposite stations. In this state, if a failure occurs on the communication path, Nodes at both ends of the failure occurrence point can detect the disconnection of the main signal. The Nodes on both ends that have detected the main signal disconnection, send the K1 byte Condition of the APS protocol from NR to S.
FR (Signal Failure Ring
e Ring)) and send. Furthermore, Des
The destination Node ID is the LOS detection Lin
Node ID in the e direction, Source ID
Changes to the Node ID of the Node that detected the main signal disconnection and sends the APS byte. The other Nodes recognize the point of failure by receiving this APS byte.

Here, with reference to FIG. 1 (FIG. 1 shows an outline of an OW communication route in a normal state of the interlocking ring network system (a state in which there is no failure on a communication path)), each node N1 to N8 is previously set. Node-ID is set and RING A and RING The two single ring systems of B are node N3 and node N, respectively.
8 and the node N4 is connected to the node N7.

In normal times, the main signal is transferred between the ring systems between the node N4 and the node N7, and these nodes are connected to the Primary-Node (Pri-Nod).
e), the path (Path) between them is set to Primary-P
It is called ath (Pri-Path). In contrast, P
The nodes that transfer the main signal when the ri-Node has a failure are the node N3 and the node N8. These nodes are Secondary-Node (Sec-Nod).
e), Path during this time is Secondary-Pat
It is called h (Sec-Path).

As described above, the OW communication route in the single ring system is provided with a termination point at either end point,
This prevents the communication contents from patrol in the ring,
In the interlocking ring system, this terminating point is set in each Sec-Node as Pri-Node.
It is provided in the connection direction and the Sec-Path direction.
And two ring systems (RING A and R
ING As the OW communication route between B), Pri-Path is used similarly to that used for main signal transmission.

As a result, the OW communication within the same ring is terminated at the Sec-Node in the ring, and the OW communication route extending between the rings is the Pri-N of each ring.
It becomes a form that terminates at Sec-Node via
A one-stroke communication path is formed.

Now, as shown in FIG. 2, if a failure occurs in a transmission route that is not used for the OW communication route, no failure will occur in the part sandwiched between such termination points. Termination / connection control is unnecessary.

Referring to FIG. 3, assuming that a fault has occurred in the Pri-Node that passes signals between the rings,
In the interlocking ring, when the Pri-Node has a communication failure, the Sec-Node plays a backup role and rescues the main signal. Even in OW communication, Pr
Since communication becomes impossible due to a failure in the i-Node, communication is switched between Sec-Node and Sec-Node.

One of the Pri-Nodes is Nod
In the case of an e failure (for example, when the node N4 becomes a Node failure), adjacent nodes (node N1 and node N in the same ring including the failed Pri-Node).
3) detects the failure of the Pri-Node due to the disconnection of the main signal. Then, the termination control is performed so that the failure point is sandwiched by the failure detection as a trigger. Further, in the Sec-Node (node N3), the Sec-Pa currently being terminated is controlled.
Connection control is performed for the route between th.

If the OW communication route is different from the initial state due to another failure occurrence / restoration (for example, the fault A is restored in FIG. 6), the Pri-N
The node N2 which has detected the failure of the node controls the connection between the nodes (node N1 and node N2) which have been terminated by the APS protocol.

In this way, the communication route shown in FIG. 3 is finally formed.

The other ring (Ring) B) Pri-
The Node (node N7) detects the main signal disconnection from the opposing ring, recognizes the Node failure, and performs termination control in the opposing ring direction (Pri-Path) where the failure occurs. Next, the node N7 sends a remote signal to the Sec-Node (node N8) to control the connection of the route between the rings. Sec-Node (Node N
8) receives this remote signal,
c-Path) is controlled.

As a result, the OW communication route between the two rings is secured, and the OW communication within the entire network system becomes possible.

When the failure of the Pri-Node (node N4) is recovered, the node N1 (that is, a node other than the Sec-Node which is adjacent to the node N4 and is under termination control)
Executes connection control for the Pri-Node and
The W communication is secured in the node N4. The node 3 will play the role of Pri-Node thereafter. This eliminates the need for switchback control at the time of failure recovery.

Referring to FIG. 4, when a failure occurs in the transmission route between the Pri-Nodes that connect the two rings, in this case, the Pri-Node is
Since it is determined that the failure between the ri-Node and the failure of the opposite Pri-Node are the same phenomenon of the main signal disconnection, the Pri-Node performs termination control on the Pri-Path side in each ring, and the Sec-Node. On the other hand, control is performed so that the transmission route between the Sec and the node as described above is used. As a result, the new transmission route is Se
Created between the c-Node and
W communication becomes possible. Even in this case, the switchback control is not performed at the time of subsequent failure recovery.

Referring to FIG. 5, when a failure occurs in the Sec-Node (eg, node N3), Sec-Nod.
Although e is the end of OW communication, Sec-Node
If a failure occurs, the adjacent Nod in the ring
e (node N2) detects the main signal disconnection, and Sec-Nod
The termination control of the route in the direction connected to e is performed.

Also in this case, if the OW communication route is different from the initial state due to another failure occurrence / restoration (for example, the fault A is restored in FIG. 6), Se
The node N1 that has detected the failure of the c-Node also controls the connection between the nodes (node N1 and node N2) that have been terminated by the APS protocol.

In this way, the communication route shown in FIG. 5 is finally formed.

At the time of recovering from the Sec-Node failure, the node N2 (that is, the node which was adjacent to the node N3 and was executing the termination control) controls the connection to the Sec-Node, and the OW. Secure the communication route.

Since this control is closed in the ring where the fault has occurred, it is not necessary to perform fault control for the other ring.

Referring to FIG. 6, Pri-Node or S
When a failure occurs in a part (on the communication route) other than the ec-Node and the Pri-Path, first, the nodes (here, the node N in this example) of the failure section in which the main signal loss is detected are detected.
The terminal control is performed so that the faulty section is sandwiched by 1 and N2). P
The ri-Node and Sec-Node specify the occurrence of a failure by the APS protocol. In the Sec-Node that has detected a failure in the communication path, the termination in the Pri-Node direction is released to establish a connection state with the Pri-Node to secure the communication route in the failure ring.

As a result, the new transmission route is set to Pri.
-This can be done between the Node and the Sec-Node, and OW communication becomes possible in the entire network system. In this case as well, the switchback control is not performed at the time of subsequent failure recovery.

Even in such a case, the failure recovery control does not spread to the other ring, and the control is closed within the single ring.

[0033]

As described above, according to the present invention, the AP
Since the S protocol is combined with the communication route termination and connection control, the interlocking ring,
Even if any failure occurs in the OW communication in the network system, there is an effect that appropriate recovery measures can be taken with minimum control. That is, there is an effect that appropriate OW communication restoration can be easily performed.

[Brief description of the drawings]

FIG. 1 Normal OW in interlocking ring
It is a block diagram for demonstrating communication.

FIG. 2 is a block diagram for explaining OW communication when a failure occurs in the orderwire communication control method according to the present invention (when a failure occurs in a route not used for OW communication).

FIG. 3 is a block diagram for explaining OW communication when a failure occurs in the orderwire communication control system according to the present invention (when a failure failure occurs in the Pri-Node).

FIG. 4 is a block diagram for explaining OW communication when a failure occurs in the orderwire communication control method according to the present invention (when a failure occurs in Pri-Path).

FIG. 5 is a block diagram for explaining OW communication when a failure occurs in the order wire communication control method according to the present invention (when a failure occurs in the Sec-Node).

FIG. 6 is a block diagram for explaining OW communication when a failure occurs in the orderwire communication control system according to the present invention (when a failure occurs in other parts).

[Explanation of symbols]

 N1 to N8 Nodes (Nodes) (P) Primary node (Primary-Node) (S) Secondary node (Secondary-Node) A Transmission line fault occurrence point OW Orderwire communication route PP Main transmission line (Primary-Path) SP Secondary transmission path (Secondary-Path)

Claims (2)

(57) [Claims] 1. A single ring system having a plurality of nodes, wherein two specific nodes of the plurality of nodes are respectively defined as a master node and a slave node, and the single ring system is the In an interlocking ring network system in which main nodes and sub nodes are connected to each other by a main path and a sub path, when performing orderwire communication across the ring systems, the failure occurs in any one of the main nodes. Occurs, in the same ring system including the faulty main node, a first step in which a node adjacent to the faulty main node detects the fault in the main node due to a main signal disconnection, and the adjacent node responds to the fault detection. The second step of performing termination control so as to sandwich the faulty main node; and including the faulty main node And a third step in which a slave node in the ring system controls connection of the slave path. 2. A single ring system having a plurality of nodes, wherein two specific nodes of the plurality of nodes are respectively defined as a master node and a slave node, and the single ring system is the In an interlocking ring network system in which primary nodes and secondary nodes are connected to each other by primary paths and secondary paths, when the primary path fails, each of the primary nodes detects a failure of the primary path. And a second step in which each of the main nodes performs termination control on the main path side in response to detection of a failure in the main path,
Each of the master nodes has a third step of instructing the slave node to control the slave path connection, the orderwire communication control method.