JP2003087278A - System and method for setting cross connect - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cross connect setting system by which an adverse effect does not occur in a cross connect setting in spite of the increase of the number of nodes. SOLUTION: A plurality of nodes from A21 to D24 are connected in a ring shape to organize a high-speed SDH network link. The respective nodes A21 to D24 are connected to a network management system (NMS) 25 for managing a cross connect processing. In the network system, the cross connect processing is set from the NMS 25 only to a transmission node of one of the nodes. The cross connect processing is performed to multiplex a low-speed signal with a high-speed signal in the transmission node and address information is added by an address information inserting part. Thus, a time for setting a pass route is shortened, only transmission node and channel information is required as management information for managing a plurality of pass routes and, then, an amount of data to be managed is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-connect setting system and method, and more particularly to SDH.
(Synchronous Digital Hierarchy) Ring system with high-order group path VC
The present invention relates to a cross-connect setting system and method for allocating (virtual containe / virtual line) to a time slot of an SDH frame to set a route in a ring.

[0002]

2. Description of the Related Art Conventionally, a cross-connect setting system and the same method are constructed as a high-speed SDH (Synchronous Digital Hierarchy) network system in which nodes are connected by a network.

FIG. 10 is a diagram for explaining a conventional cross-connect setting method. As shown in FIG. 10, conventionally, the cross-connect information itself is set for each node.

The contents of the conventional cross-connect setting procedure will be described with reference to FIG. 2 showing an embodiment of the present invention and FIG. 10 showing a conventional example. In the conventional cross-connect setting procedure, when setting a path route from the node A21 to the node C23, a low-speed to high-speed add setting is performed for the node A21 that is a transmission node, and a node B22 and a node D24 that are relay nodes. Is set to high speed to high speed, and drop setting is set to high speed from low speed to the node C23 which is the receiving node.

Prior invention example 1 similar in technical field to the present invention
As an example of "SDH" in Japanese Patent Laid-Open No. 2000-341309
There is a transmission network. In the first invention example of the prior application, it is an object to easily change the setting of the cross-connect information and prevent the setting change of the cross-connect information from causing a problem in the line service. In this problem, each network element monitors the flag information set in a predetermined area of the section overhead, and the flag information is for its own device, and instructs the setting of new cross-connect information. If the flag information is not for its own device, set the cross connect information according to the instruction if
Bypass flag information to adjacent network elements.

[0006]

However, in the above-mentioned conventional network management system, it is necessary to manage even the information of the cross-connect map of each node. Therefore, when the setting of the cross-connect information is changed, the amount of information increases as the number of nodes forming the ring network increases, and it takes a lot of time to set the path route.

It is an object of the present invention to provide a cross-connect setting system and method that do not cause adverse effects on cross-connect setting even if the number of nodes increases.

[0008]

In order to achieve the above object, a cross-connect setting system according to claim 1 is a high-speed SD constructed by connecting a plurality of nodes in a ring shape.
An H network link and a cross-connect management device that is connected to each of the plurality of nodes and manages the cross-connect processing of the high-speed SDH network link. A feature of the present invention is that cross-connect processing is set only in the transmitting node.

Further, the node includes an address information terminating portion of a functional block that terminates address information indicating a destination of a transmission signal, and a cross-connect portion of a functional block that multiplexes into a high speed signal and separates into a low speed signal. And an address information insertion unit of a functional block for inserting a transmission signal.

Further, the transmitting node manages a relay node that processes a high-speed signal and a receiving node that processes a high-speed signal by performing a mapping process on an arbitrary time slot of the high-speed signal, and performs a cross-connect process. The process may be a process of allocating a high-order group path signal in the received low speed and high speed SDH frames to a designated channel in the low speed and high speed SDH frames on the transmission side.

According to a fifth aspect of the present invention, a cross-link for connecting a plurality of nodes in a ring shape to construct a high-speed SDH network link, and managing cross-connect processing of the high-speed SDH network link with each of the plurality of nodes. The connection management device is connected, and the cross connection management device sets the cross connection process only to any one of the transmission nodes of the plurality of nodes.

Further, the above-mentioned transmitting node performs mapping processing on an arbitrary time slot of a high speed signal,
The high-speed signal is processed by the relay node, and the high-speed signal is dropped and managed by the receiving node.
It is preferable that the high-order group path signal in the received low-speed and high-speed SDH frames is assigned to a designated channel in the low-speed and high-speed SDH frames on the transmission side.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the cross-connect setting system and method according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 9 show an embodiment of the cross-connect setting system and method of the present invention.

FIG. 1 shows a block diagram of the cross-connect setting system of this embodiment. The cross-connect setting system in FIG. 1 is configured to include a path route management device 10, a transmission node 11, a relay node 12, and a reception node 13. The cross-connect setting system of this configuration is a configuration diagram of a transmission system that transmits a high-order group path signal from a transmission node 11 to a reception node 13 via a network that transmits at high speed.

Referring to FIG. 1, the cross-connect setting system of this embodiment has a transmitting node 11, a relay node 12,
The reception node 13 and the path route management device 10 are included in the configuration. The transmitting node 11, the relay node 12, and the
Each of the receiving nodes 13 has an address information termination unit 1, 4,
7, address information insertion units 2, 5, 8 and cross-connect units 3, 6, 9.

In the above structure, when data is transferred from the transmitting node 11 to the receiving node 13, the transmitting node 11
Therefore, a process of mapping the high-speed signal to an arbitrary time slot, a process of relaying the signal at the relay node 12, and a process of dropping the signal at the receiving node 13 are required.
That is, each node 11, 12, 13 needs cross-connect processing. The feature of this embodiment is that the management of this cross-connect processing is performed by the path route management device 10 of FIG. 1 or the cross-connect management device of the network management system (NMS) 25 of FIG. The cross-connect process is set only for the transmitting node (any one of the nodes A to D in FIG. 2). The details will be described below.

As a method for realizing this cross-connect processing, transmission is performed before and after the functional blocks (cross-connect units 3, 6, 9) for multiplexing each node 11, 12, 13 into a high-speed signal and demultiplexing into a low-speed signal. A functional block that terminates address information indicating a signal destination (address information termination unit 1,
4, 7) and functional blocks for inserting transmission signals (address information insertion units 2, 5, 8). Based on this function, the transmission node 11 performs cross-connect processing such that a low speed signal is multiplexed with a high speed signal, and the address information insertion unit 2 adds address information.

This address information indicates the destination node, and the node receiving this information can determine whether it is the information to be dropped or the information to be transferred at its own node. Therefore, in the relay node 12, the address information terminating unit 4 interprets that this information is not the main signal to be dropped at its own node, and the cross-connect unit 6 maps it to a high-speed signal and transfers the main signal to the next node.

The receiving node 13 interprets that the information is the main signal to be dropped at its own node of the address information termination unit 7, and drops the main signal at the cross-connect unit 9. The address information inserted by the address information insertion unit 2 is centrally managed and set by the path route management device 10.

FIG. 2 shows an example of actual operation for the configuration of the node shown in FIG. In the following description, it is assumed that the node A, the node B, and the node C in FIG. 2 are set as the transmitting node, the relay node, and the receiving node, respectively. Further, FIG. 2 is a configuration example of a ring network system capable of transmitting 2.4 Gbit / s by the SDH transmission device. In this ring network system, high-speed (2.4 Gb / s) SDH frame transmission is performed within the ring, and 4 units per 3 units of the high-order group path VC.
8ch transmission is possible. Low speed S outside the network
DH frame transmission is performed, and by multiplexing the high-order group path signals in the low-speed SDH frame up to 48 ch in the high-speed SDH frame, the signals can be transmitted via the ring network.

In FIG. 2, a network management system (NMS) 25 manages the paths of higher-order paths in the ring, and each node A21, node B22, node C2.
3. Set the cross-connect processing content for node D24. This establishes a path route. Here, the cross-connect processing means that the high-order group path signals in the received low-speed and high-speed SDH frames, as shown in FIG.
This is a process of allocating to a designated channel in the low speed and high speed SDH frames on the transmitting side. In the cross-connect processing, allocation is assigned to channels of low-speed SDH frames to high-speed SDH frames, add setting is assigned to channels of high-speed SDH frames to high-speed SDH frames, and allocation is set to channels of high-speed SDH frames to low-speed SDH frames. This is called drop setting.

A free byte of SOH (section overhead) of a high-speed SDH frame is used as a method of cross-connect management in each node for establishing a path route. This SOH (section overhead) is added as header information of the SDH frame for transmission in units of higher-order path VC, and bytes for synchronization processing and error detection are defined. However, it is also possible to use undefined bytes.

The address information byte shown in FIG.
Define to. The address information byte is composed of a node name and a channel indicating the transmission destination. The node name is the identification name of each node that makes up the ring network,
The network management system (NMS) 25 manages the network management system (NMS) 2 in the ring configuration.
5 is set in each node. The above-mentioned nodes refer to the node A21, the node B22, the node C23, and the node D24 here. Each of these nodes 2
1, 22, 23, and 24 have a plurality of high-speed and low-speed SDH interfaces for transmitting high-order group path signals inside and outside the ring network.

The channel is a management number for uniquely distinguishing the time slot of the higher-order group path signal unit in the SDH frame. The address information byte is added to the high-order group path signal unit to be transmitted, and the high-speed S
Prepare DH frames for the number of channels (48 ch). Each node 21, 22, 23, 24 is provided with a function for performing cross-connect processing setting using this address information. An example of the functional block configuration is shown in FIG. The network management system (NMS) 25 in FIG. 5 is a system for managing the path route of the high-order group path signal.

The network management system (N
In the system configured by the MS) 25 and the node, the cross-connect process in each node uses the address information indicating the destination of the path signal as the SOH of the high-speed SDH frame.
Address information byte insertion section 52 to be inserted in (section overhead) and S of the received high speed SDH frame.
It is executed by an address information byte processing unit 51 that terminates the address information in the OH and a cross-connect unit 53 that processes the terminated address information and cross-connects the higher-order path VC signal to the channel on the transmission side.

The cross-connect unit 53 and the address information byte insertion unit 52 having the above-mentioned configuration are shown in FIG. 6 based on the information set by the network management system (NMS) 25 and the address information received by the address information byte processing unit 51. Process according to the procedure of the flowchart. An example of this processing procedure will be described below.

An example of cross-connect processing operation at each node when transmission is performed via the ring network of FIG. 2 will be described. For explanation, channel X of node A
To the channel Y of the node C are taken as an example.

In FIGS. 5 and 6, the network management system (NMS) 25 executes the setting for the node A so as to perform the path route from the channel X of the node A to the channel Y of the node C shown in FIG. Yes (step S1). The cross-connect processing unit 23 of FIG.
An application example of the cross-connect unit 53 of FIG. 5 is shown. From this, the cross-connect unit 53 and the address information byte insertion unit 52 in the node A follow the flowchart of FIG. 6 and follow the channel X of the transmitting node (node A) shown in FIG.
Is cross-connected (add setting) to an empty channel of the high-speed SDH frame. At the same time, an address information byte indicating "channel Y of destination node (node C)" is inserted into SOH (step S2).

Node B or D which is a relay node
Receives the address information in the address information byte processing unit 51 (step S5), and sets the cross-connect map for relaying the high-order group path signal (through setting) in the cross-connect unit 53 according to the flowchart of FIG. The same information as the address information byte received by the address information byte processing unit 51, that is, "channel Y of the destination node C" is inserted by the address information byte insertion unit 52 (step S7).

In the node C which is the receiving node, when the address information byte processing unit 51 receives this address information byte (step S5), the low-speed side channel Y shown in FIG. The setting (drop setting) is made (step S8). As described above, the path route setting from the channel X of the node A to the channel Y of the node C is set as shown in FIG.

In the cross-connect setting system and method of this embodiment, the load of the cross-connect process at the time of setting the path route of the host network management system is reduced. For this purpose, a cross-connect setting system and method are provided in SDH (Synchronous Digital Hierarchy).
/ Synchronous Digital Hierarchy) ring system, high-order group path VC (virtual container)
Is assigned to the time slot of the SDH frame, and the route in the ring is set. The synchronous digital hierarchy (SDH / Synchronous Digital Hierarchy) ring system is a rule for hierarchically multiplexing channels when multiplexing signals for digital communication using optical fibers.

According to the above-described embodiment, the cross-connect process in each node can be performed only by the request for setting the address information byte from the network management system to the transmitting node. Therefore, the time for setting the path route can be shortened. Further, the management information of the network management system that manages a plurality of path routes need only be the destination node and channel information. Therefore, the amount of data to be managed can be small.

FIG. 8 shows a functional block configuration example of the second embodiment. In FIG. 8, the network management system 2
Reference numeral 5 is a system for managing the path route of the high-order group path signal similarly to FIG.

The system shown in FIG. 8 comprises a network management system 25 and nodes. The node is an address information byte (POH / Pass Overhead) monitor unit 71.
And a high-speed SD including an address information byte (POH / Pass Overhead) insertion unit 72 and a cross-connect unit 73.
The H frame and the low speed SDH frame are received, and the address information is received from the network management system 25.

The address information byte (POH) monitor unit 71 monitors the address information from the high speed SDH frame information. Address information byte (POH) insertion part 7
2 inserts the address information byte into the address information byte according to the setting information of the network information system 25 for the low speed SDH frame information to be cross-connected. The cross connect unit 73 uses the address information byte (P
OH) The high speed S based on the result of monitoring by the monitor unit 71.
The DH frame transmission or the low-speed SDH frame transmission is identified and cross-connected to the channel on the transmission side.

The cross-connect unit 73 and the address information byte (POH) insertion unit 72 having the above-mentioned configuration perform processing according to the flowchart of FIG. 9 according to the address information set by the network management system 25.

In the second embodiment, as means for transmitting the address information byte, the address information is defined in the empty byte in the POH of the high order group path signal. As shown in FIG. 8, the empty byte of the address information byte (POH) is used,
As a mechanism of cross-connect processing in each node by the address information byte, the address information byte (POH) insertion unit 7 is provided on the low speed side in the preceding stage of the cross-connect unit 73.
2. Address information byte (POH) monitor 7 on the high speed side
Prepare 1. The address information byte (PO
H) The processing of the inserting unit 72 and the processing procedure of the cross connect unit 73 based on the address information received by the address information byte (POH) monitor unit 71 follow the flowchart of FIG.

The cross-connect processing operation at each node when transmission is performed via the ring network of FIG. 2 will be described. For the sake of explanation, channel X of node A
To the channel Y of the node C are taken as an example.

The network management system 25 sets the node A so that a path route from the channel X of the node A to the channel Y of the node C is established (step S11). From this, the cross-connect unit 73 and the address information byte (POH) insertion unit 72 in the node A are provided.
Inserts the address information byte indicating "Channel Y of the destination node C" into the POH according to the flowchart of FIG. 9 (step S12).

Node B or D which is a relay node
9 receives the address information in the address information byte (POH) monitor unit 71 (step S15), and FIG.
In accordance with the flowchart of FIG. 7, the cross-connect unit 73 sets the cross-connect map for relaying the high-order group path signals (through setting) (step S17). The same information as the address information byte received by the address information byte (POH) monitoring unit 71, that is, "channel Y of the destination node C" is inserted by the address information byte (POH) inserting unit 72 (step S18).

In the node C which is the receiving node, the address information byte (POH) monitor unit 71 monitors this address information byte (step S15), and based on this monitor result, the cross-connect unit 73 follows the flowchart of FIG. The cross connect map will be set (drop set) to the channel Y on the low speed side (step S).
18).

The basic operation of the second embodiment is similar to that of the first embodiment, but the POH is not terminated at the node. Therefore, the difference is that the address information byte is inserted into the POH at the transmitting node and then transferred through to the receiving node.

The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

[0044]

As is apparent from the above description, the cross-connect setting system and the method of the present invention construct a high-speed SDH network link by connecting a plurality of nodes in a ring shape, and connect each of the plurality of nodes. And a cross-connect management apparatus that manages the cross-connect processing of the high-speed SDH network link, and the cross-connect management apparatus sets the cross-connect processing only for any of the transmitting nodes of the plurality of nodes. Therefore, the time for setting the path route can be shortened, and the management information for managing the plurality of path routes is only the destination node and channel information, and the amount of data to be managed can be small.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an embodiment of a cross-connect setting system of the present invention.

FIG. 2 is a configuration example of a ring network system using an SDH transmission device.

FIG. 3 is a diagram showing an example of an allocation processing procedure to a designated channel in low-speed and high-speed SDH frames on the transmission side.

FIG. 4 is a diagram showing a definition example of SOH insertion address information.

FIG. 5 is a diagram showing an example of a functional block configuration prepared for a node.

FIG. 6 is a flowchart illustrating a processing procedure example of the first embodiment.

FIG. 7 is a diagram showing an example of setting a path route from channel X of node A to channel Y of node C.

FIG. 8 is a diagram illustrating a functional block configuration example of a second embodiment.

FIG. 9 is a flowchart illustrating a processing procedure example of the second embodiment.

FIG. 10 is a diagram for explaining a conventional cross-connect setting method.

[Explanation of symbols]

1, 4, 7 Address information termination unit 2, 5, 8 Address information insertion unit 3, 6, 9 Cross-connect unit 10 Path route management device 11 Transmission node 12 Relay node 13 Reception node 21 Node A 22 Node B 23 Node C 24 Node D 25 Network management system (NMS) 51 Address information byte processing unit 52 Address information byte insertion unit 53 Cross-connect unit 71 Address information byte (POH / Pass Overhead) monitor unit 72 Address information byte (POH / Pass Overhead) insertion unit 73 Cross-connect part Through setting Add setting Drop setting

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazunori Shintani             Miyagi Prefecture Kurokawa-gun Yamato-cho Yoshioka character Raijin 2 shrine             Inside NEC Corporation F-term (reference) 5K030 JA10 JA12 JL10 LB07                 5K031 AA01 AA14 CA08 CB12 DA12                       DA19 DB14

Claims (7)

[Claims] 1. A high-speed SDH network link constructed by connecting a plurality of nodes in a ring shape, and a cross-connect management that is connected to each of the plurality of nodes and manages cross-connect processing of the high-speed SDH network link. A cross-connect setting system comprising: a device, and setting the cross-connect process from the cross-connect management device to only one of the transmission nodes of the plurality of nodes. 2. The node comprises an address information terminating portion of a functional block that terminates address information indicating a destination of a transmission signal, and a cross-connect portion of a functional block that multiplexes into a high speed signal and separates into a low speed signal. The cross-connect setting system according to claim 1, further comprising: an address information insertion unit of a functional block into which the transmission signal is inserted. 3. The transmitting node performs mapping processing on an arbitrary time slot in a high speed signal,
The cross-connect setting system according to claim 1 or 2, wherein a relay node that relays the high-speed signal and a reception node that drops the high-speed signal are managed. 4. The cross-connect process is a process for allocating a high-order group path signal in a received low-speed and high-speed SDH frame to a designated channel in the low-speed and high-speed SDH frame on the transmission side. 1
The cross-connect setting system according to any one of 1 to 3. 5. A high-speed SDH network link is constructed by connecting a plurality of nodes in a ring shape, and a cross-connect management device that manages each of the plurality of nodes and a cross-connect process of the high-speed SDH network link. A cross-connect setting method is characterized in that the cross-connect management device sets the cross-connect process only to one of the transmission nodes of the plurality of nodes. 6. The transmitting node processes the high-speed signal at a relay node by performing mapping processing on an arbitrary time slot of the high-speed signal, and the receiving node drops the high-speed signal for management. The cross-connect setting method according to claim 5. 7. The cross-connect process is a process for receiving a high-order group path signal in a received low-speed and high-speed SDH frame,
7. The cross-connect setting method according to claim 5, which is a process of allocating to a designated channel in the low-speed and high-speed SDH frames on the transmission side.