JP2004214903A - Cross connection system and method of controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cross connection system which is capable of obtaining an optimal set condition quickly when switching due to a failure without having an adverse effect on paths which are not switched yet and possesses traffic of a high duty factor, and to provide its controlling method. <P>SOLUTION: The switching of a plurality of cross connection switches which have the same configuration substantially as the hardware is set up in two-dimensional manner on the basis of a map representing an information transfer route structure and controlled, and the switches are operated from a first map to an information transfer route structure represented by a second map when the barrier is generated. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cross-connect system of a backbone transmission device constituting a ring network such as in a SONET / SDH interface and a control method of the cross-connect system.
[0002]
Here, "SONET" is an abbreviation of Synchronous Optical Network, and is one of large-capacity optical transmission systems connecting telephone offices. It is used in the United States and its use is specified in ANSI T1.105, ANSI T1.106, and ANSI T1.117. It is also used as an ATM physical layer. “SDH” is an abbreviation for Synchronous Digital Hierarchy, which is an international standard for an optical transmission system that connects telephone offices and accommodates many telephones and communication lines. This technology is similar to US SONET. A “ring network” is one of network topologies that represent a network connection configuration, and a bus is formed into a ring to connect a number of stations (terminals) in a distributed manner. Ring-type LANs connect the bus in a ring without termination, so the data transmission direction on the bus may be one-way, using a metallic cable for the part where the interval between adjacent stations is short, and an optical fiber cable for the part where the interval is long. Therefore, a large-scale LAN with a long cable length can be easily realized. Typical ring-type LANs include an IEEE 802.5 standard token ring LAN and an ANSI standard FDDI-LAN. “Cross Connect” is a general term for a device for connecting a large number of cables, and in particular, may refer to a device used by a communication company to connect a line to a large-capacity network. This is what it means.
[0003]
[Prior art]
In a multiplex repeater of a large-capacity long-distance transmission system, in order to secure high reliability, 1 + 1, 1: 1, 2 Fiber and 4 Fiber BLSR (Bidirectional) are used as line protection.
(Line Switched Ring) system is adopted.
[0004]
The BLSR (Bidirectional Line Switched Ring) is a method in SONET that normally selects an optimal path and switches to a backup path in the opposite direction when the ring is disconnected. The connection mode between the SONET nodes can be either one-to-one or ring-like. However, in general, the connection is often a ring-like connection and each path is duplicated. If the route is duplicated, communication can be continued using the route in the opposite direction even if the ring is broken at any point. One of the duplication methods is the BLSR, and the other is the UPSR (Uni-directional Path Switched Ring). The operation of the 4-fiber BLSR configuration will be described below as an example.
[0005]
FIGS. 19 to 24 are diagrams showing an example of a switch operation in a general 4-fiber BLSR system. The operation when a failure occurs in the transmission path (optical fiber) and the route is switched will be described below with reference to FIGS.
[0006]
Each figure shows a network composed of four nodes (NODE), and each node is connected by four optical fiber transmission lines. If a failure occurs in any transmission path in this ring network configuration, switching occurs to rescue the service.
[0007]
Although the word "node" originally means "knot" or "intersection", in an information communication network, a device having a switching function, a transmission function, a network management function, and the like is collectively called a node. A communication line connecting nodes is called a link. A router is a typical node on the Internet, but what is described here is an exchange or a LAN switch as another main node. RFC 1392 defines a node as an "addressable device connected to a computer network."
[0008]
FIG. 19 shows a “RING switch operation example (Normal)”. In FIG. 19, when data is ADD / DROPed between NODE1-2, NODE1-3, and NODE2-3 and the service is normally operated, when NODE1 is noticed and no switching occurs. FIG.
[0009]
FIG. 20 shows “Example of RING switch operation (West Span Bridge & Switch)”. FIG. 20 shows a case where data is ADD / DROP between NODE1-2, NODE1-3, and NODE2-3, and a failure occurs in WORK LINE between NODE1-2. By paying attention to NODE1 in the map of FIG. 20, it can be seen that the service has been relieved by switching the signal passing through the West Work Line to the West Prot side in the normal state. This switching control in NODE1 is referred to as West Span Bridge & Switch.
[0010]
FIG. 21 shows “Example of RING switch operation (East Span Bridge & Switch)”. FIG. 21 shows a case where data is ADD / DROP between NODE1-2, NODE1-3, and NODE2-3, respectively, and a failure occurs in the WORK LINE between NODE1-4. By paying attention to NODE1 in the map of FIG. 21, it can be seen that the service has been relieved by switching the signal passing through the EAST WORK LINE to the EAST PROT side in the normal state. This switching control in NODE1 is called East Span Bridge & Switch.
[0011]
FIG. 22 shows “Example of RING switch operation (West Ring Bridge & Switch)”. FIG. 22 shows a case where data is ADD / DROP between NODE1-2, NODE1-3, and NODE2-3, respectively, and a failure has occurred in WORK LINE and PROT LINE between NODE1-2. By paying attention to NODE1 in the map of FIG. 22, it can be seen that the service has been relieved by switching the signal passing through the West Work Line to the East Prot side in the normal state. This switching control in NODE1 is referred to as West Ring Bridge & Switch.
[0012]
FIG. 23 shows “Ring switch operation example (East Ring Bridge & Switch)”. FIG. 23 shows a case where data is ADD / DROP between NODE1-2, NODE1-3, and NODE2-3, and a failure occurs in WORK LINE and PROT LINE between NODE1-4. By paying attention to NODE1 in the map of FIG. 23, it can be seen that the service has been relieved by switching the signal passing through the EAST WORK LINE to the WEST PROT side in the normal state. This switching control in NODE1 is called East Ring Bridge & Switch.
[0013]
FIG. 24 shows “Example of RING switch operation (Full-Path-Through)”. FIG. 24 shows a case where data is ADD / DROP between NODE1-2, NODE1-3, and NODE2-3, and a fault occurs in WORK LINE and PROT LINE between NODE2 and NODE3. Here, paying attention to NODE1, it can be seen that the PROT LINE which is not used is through-connected and the service is rescued in the normal state. This switching control in NODE1 is called Full-Path-Through.
[0014]
A conventional device generally has a cross-connect switch and a changeover switch at the time of failure in order to realize the above-described protection configuration.
[0015]
An optical cross-connect device and an optical transmission system for switching a line and a path while using a high-speed optical signal as an optical signal have been conventionally proposed (for example, Patent Document 1).
[00016]
[Patent Document 1]
JP-A-11-41173 (abstract, FIG. 1)
[0017]
[Problems to be solved by the invention]
However, there are still some problems in a specific method for increasing the cross-connect capacity in the above-described conventional technology. In other words, a cross-connect device that can immediately obtain an optimal setting state when switching occurs due to the occurrence of a failure, and when setting each Normal map and Protection map calculated for switching in hardware (H / W). There is a need for a control method that does not affect a path that has not been switched due to the execution of relocation, and a need to determine an appropriate route even when the traffic usage rate is high.
[0018]
Therefore, an object of the present invention is to provide a new and excellent cross-connect system and a control method of the cross-connect system that solve the above-mentioned conventional problems.
[0019]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has the following characteristic features.
[0020]
(1) a plurality of switch elements having a switch function of switching a connection relationship of a plurality of buses connected to the self according to given control information and having substantially the same configuration as hardware; A functional unit configured to generate information, and to set and manage a structure of an information transmission route configured by the plurality of switch elements and the plurality of buses based on a map representing the structure, and A first map which is applied at least when no failure has occurred in the bus and a second map which is applied when a failure has occurred in the bus, and information based on the first map when a failure has occurred. A control element adapted to switch from the structure of the transmission route to the structure of the information transmission route according to the second map. Beam.
[0021]
(2) The cross-connect system according to (1), wherein the switch element includes firmware.
[0022]
(3) The control element calculates a route calculation based on the structure of the information transmission route based on the first map, and when the route cannot be secured as it is, the structure of the information transmission route based on the second map. (1) The cross-connect system according to the above (1), which is configured so as to determine the optimum route by performing rearrangement to the network.
[0023]
(4) The control element may calculate a route calculation result based on the structure of the information transmission route based on the first map and / or a calculation result of a route calculation based on the structure of the information transmission route based on the second map. When a corresponding state is set in the switch element, control is performed so as not to affect a bus in which the connection relationship has not changed even if the rearrangement related to the setting is executed. The cross-connect system according to the above (3).
[0024]
(5) When calculating the route for the rearrangement, the control element minimizes a change in state of the plurality of switch elements that change the bus connection relation and those that change through the connection. The cross connect system according to the above (3), which is configured to execute the calculation.
[0025]
(6) A plurality of switch elements having a switch function of switching a connection relationship between a plurality of buses connected to the self in accordance with given control information and having substantially the same configuration as hardware, and the plurality of switch elements. A first structure which is configured to manage the structure of an information transmission route formed by a bus in terms of a surface based on a map representing the structure, and which is applied at least when no failure occurs in the bus as the map. A map and a second map to be applied when a failure occurs in the bus are prepared, and when a failure occurs, the structure of the information transmission route based on the first map is changed to the structure of the information transmission route based on the second map. Control method of switching cross-connect system.
[0026]
(7) The control method for the cross-connect system according to (6), wherein a circuit including firmware is applied as the switch element.
[0027]
(8) When a route is calculated based on the information transmission route structure based on the first map and the route cannot be secured as it is, relocation to the information transmission route structure based on the second map is performed. (6) The method for controlling a cross-connect system according to the above (6), wherein the optimal route is determined by executing the control.
[0028]
(9) A state corresponding to the calculation result of the route calculation based on the structure of the information transmission route based on the first map and / or the calculation result of the route calculation based on the structure of the information transmission route based on the second map is determined. The method of controlling a cross-connect system according to the above (8), wherein when setting the switch element, the control is performed so as not to affect the bus in which the connection relation does not change even if the rearrangement relating to the setting is executed.
[0029]
(10) In calculating the route for the rearrangement, the calculation is performed so that the change in the state of the plurality of switch elements that change the connection relation of the bus and those that change through the connection are minimized. The control method of the cross connect system according to the above (8) to be executed.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of a cross-connect system and a control method of the cross-connect system of the present invention will be described in detail.
[0031]
FIG. 1 is a conceptual diagram illustrating a cross-connect system and a control method of the cross-connect system according to the present invention.
[0032]
In the cross-connect system of the present invention, a plurality of switches having a switch function of switching a connection relationship of a plurality of buses connected to each other according to given control information and having substantially the same configuration as hardware An element (each SW in “H / W control” in FIG. 1), a plurality of switch elements (each SW) and a plurality of buses (each in “H / W control” in FIG. A function unit ("application control" in FIG. 1) for setting and managing the structure of the information transmission route constituted by the lines connecting the SWs based on a map representing the structure, and At least a first map to be applied when a failure has not occurred in the bus and a second map to be applied to when a failure has occurred in the bus are held ("Application control" in FIG. 1). When a failure occurs in the map information area (two-sided configuration), a control element (see FIG. 1) switches from the structure of the information transmission route based on the first map to the structure of the information transmission route based on the second map. Route control rearrangement program in “application control” and cross-connect setting and switching control in “higher-level setting control”.
[0033]
The cross connect system provided by the present invention is, as a more specific example, a cross connect level capacity VC-4 256 × 256 Ch or VC-3 768 × 768 Ch as a large capacity and highly reliable SDH / SONET device. This is a control method for realizing a cross-connect level switch with a cross-connect level capacity of VC-4 512 × 512 Ch or VC-3 1536 × 1536Ch by combining six connect circuits. (Note: VC is a virtual channel. A communication channel set up with a communication partner on an ATM network.)
[0034]
However, when the cross-connect circuit is a combination of six circuits, depending on the setting procedure, output to the set time slot may not be possible even though the route is empty. In that case, it is necessary to rearrange the map in order to change the already set route and to conduct all the signals.
[0035]
In the present invention, switching control for calculating the route and setting the optimum route by rearranging the map is executed. An embodiment for performing such rearrangement will be described below.
[0036]
2 to 6 show patterns that require rearrangement of the map as a result of calculating the route. These figures show a case where a cross connect circuit of 1536 × 1536CH is realized in VC-3 (50 Mb / s) conversion by combining six cross connect circuits (SW1 to SW6) of 768 × 768 CH in VC-3 conversion. It is a block diagram, and the input and output of each cross-connect circuit (SW1-SW6) are represented by VC4-64c (10 Gbit / s) for convenience. That is, one cross-connect circuit enables 40 Gb / s capacity cross-connect, and six cross-connect circuit configurations enables 80 Gb / s capacity cross-connect. .
[0037]
Hereinafter, an example in which the map needs to be rearranged when the cross-connect map is set in the order of FIGS. 2 to 6 will be described.
[0038]
FIG. 2 shows a case where the following map setting is performed in the configuration of the present invention.
Input 5 to Output 1
Input 6 to Output 2
Input 7 to Output 3
Input 8 to Output 4
The route at this time is indicated by a thick line in the figure.
Each route is set from the route above each cross-connect circuit in the set order.
[0039]
FIG. 3 shows a case where the following map setting is performed in the configuration of FIG.
Input 1 to Output 5
Input 2 to Output 6
The route at this time is indicated by a thick line in the figure.
Each route is set from the route above each cross-connect circuit in the set order.
[0040]
In this state, even if an attempt is made to perform the following map setting, the route is already blocked and broadcasting cannot be performed.
Input 5 to Output 7
Input 6 to Output 8
(Note: Broadcast refers to sending data to an unspecified number of parties without specifying the destination of the data. Generally, multicast and broadcast, which send the same data by specifying multiple destinations, are distinguished from each other. In version 6 (IPv6) of IP (Internet Protocol), broadcast is included in multicast and treated as a special case. Address information is used in LANs and TCP / IP networks.)
[0041]
FIG. 4 shows a case where the map is rearranged in the configuration of FIG. 3 and the following map setting is performed.
Input 5 to Output 7
Input 6 to Output 8
At this time, the above-mentioned map that has taken the route of SW1-SW3-SW-6 in FIG. 3 is rearranged to SW1-SW4-SW-6.
Input 1 to Output 5
Input 2 to Output 6
As described above, by performing the rearrangement of the map, the broadcast from the input 5 to the output 7 and the input 6 to the output 8 can be performed.
[0042]
FIG. 5 shows a case where the following map settings are deleted in the configuration of FIG.
Input 5 to Output 7
Input 6 to Output 8
[0043]
In this state, even if an attempt is made to perform the following map setting, the route is already blocked and broadcasting cannot be performed.
Input 7 to Output 7
Input 8 to Output 8
[0044]
FIG. 6 shows a case where the map is rearranged and the following map settings are made in the configuration of FIG.
Input 7 to Output 7
Input 8 to Output 8
At this time, the above-mentioned map that has taken the route of SW1-SW4-SW-6 in FIG. 5 is rearranged to SW1-SW3-SW-6.
Input 1 to Output 5
Input 2 to Output 6
As described above, by performing the rearrangement of the map, the broadcast from the input 7 to the output 7 and the input 8 to the output 8 can be performed.
[0045]
FIG. 7 is a flowchart for explaining an algorithm of relocation control in the embodiment of the present invention.
[0046]
After the map setting (S1), the optimum route of the set cross-connect switch is calculated (S2). In this step (S2), the setting is performed sequentially from the top of each cross-connect circuit in the order in which the setting is completed. Next, it is determined whether or not the rearrangement is necessary (S3). When the necessity arises, the rearrangement is executed and the maps of all the switches are created again (S4). On the other hand, when there is no need for rearrangement, only an additional map is created (S5). After the setting of the normal map, a protection map is created (S6). When the route is determined, the switches 1 to 6 are switched to set a new cross connect map (S7). At this time, the switch 1 to the switch 6 are configured to be controlled at the same time, so that the signal is not interrupted instantaneously even if the route of the existing map is changed by the setting after the rearrangement.
[0047]
As in the above embodiment, the optimal route is calculated at the time of creating a Normal map and at the time of creating a protection map, and it is determined whether or not map relocation is necessary. Can be realized.
[0048]
FIG. 8 is a flowchart showing an algorithm for determining a route according to the present embodiment. This flowchart shows a route determination flow when a user actually sets and adds a cross-connect. As a configuration procedure, a Normal (basic) map creation, a Br & Sw map creation, and a Through map creation procedure are performed. As described above, since the Normal map, the Br & Sw map, and the Through map are not set at the same time, the Normal map is set. At that time, a Br & Sw map and a Through map are created and managed in another aspect so that they can be set when switching occurs.
[0049]
The above-mentioned “Normal map creation” is the creation of a basic map, and the set route is normally set as the state of the switches SW1 to SW6. The state in which one Normal map is set is shown in FIG. 2 described above.
[0050]
"Br & Sw map creation" is to create a protection map, and a path is searched based on a Normal map. When the switching of the BLSR (Bidirectional Line Switched Ring) method of 1 + 1, 1: 1, 2 Fiber and 4 Fiber is performed as the line protection, the switches SW1 to SW6 are set by the surface switching. Also, the case of the 4-fiber BLSR configuration of STM64 is special, and the rearrangement of the protection map may be required when the protection map is generated.
[0051]
Regarding “Create a through map”, it is necessary to secure a through setting map when a 2-fiber and a 4-fiber BLSR are configured. The path is searched based on the Normal map. Since the Br & Sw map and the Through map are not set at the same time, a route common to the Br & Sw map is selected.
[0052]
FIG. 9 to FIG. 17 are diagrams for explaining the operation of route determination according to the embodiment of the present invention. Although the operation in the pattern (condition) requiring the rearrangement of each map has already been described with reference to FIGS. 2 to 6, the operation of the embodiment of the present invention will be described in detail with reference to FIGS. I do.
[0053]
Here, for convenience, the control operation of the route determination in units of 10 Gb / s will be described in detail.
[0054]
FIG. 9 shows an example of route determination according to the present embodiment (when setting a non-protection map). This figure shows a route when the following map settings are made.
Input 1 to Output 2
Input 2 to Output 1
This map setting is an example of a map setting having no protection configuration. Normally, as shown in route 1 and route 2 in the figure, the middle-stage cross-connect circuits SW3 and SW4 are used equally, respectively, and the respective cross-connect circuits are used. Is controlled so that the map is packed in order from the top.
[0055]
Next, FIG. 10 shows an example of route determination (when setting the 4F BLSR Normal map-1) according to the present embodiment. In the protection configuration of this example, it is possible to freely determine the switch configuration of the interface package. The protection configuration is a 4F BLSR configuration, and the input / output 6 is set to West Work, the input / output 5 is set to West Work, the input / output 4 is set to West Prot, and the input / output 3 is set to East Prot.
[0056]
The map setting in FIG. 10 is as follows.
Input 6 to Output 7
Input 7 to Output 6
Also in the BLSR configuration, the Normal map setting is usually such that the middle-stage cross-connect circuits SW3 and SW4 are equally used as shown in the route 3-1 and the route 4-1 in the figure, and from the top of each cross-connect circuit. Control is performed so that the maps are packed in order.
At this time, a route 3-1 in the drawing is a direction in which ADD is performed from the input 7 to the ring network output 6 in the BLSR configuration, and a route 4-1 is a map in a direction in which DROP is performed from the input 6 to the output 7 of the ring network in the BLSR configuration. Settings.
[0057]
In the case of the BLSR configuration, it is necessary to generate a protection map at the time of setting the Normal map shown in FIG. 10 and secure a route. FIGS. 11, 12, and 13 show examples of the protection map in the present invention.
[0058]
FIG. 11 illustrates an example of route determination (generation of 4F BLSR Span Bridge & Switch map-1) according to the present embodiment. Route 3-2 is a Span Bridge map corresponding to Normal map route 3-1. The route 4-2 is a Span Switch map corresponding to the Normal map route 4-1.
[0059]
FIG. 12 shows an example of route determination (4F BLSR Ring Bridge & Switch map-1 generation) according to the present embodiment. Route 3-3 is a Ring Bridge map corresponding to Normal map route 3-1. The route 4-3 is a Ring Switch map corresponding to the Normal map route 4-1.
[0060]
FIG. 13 shows an example of route determination (4F BLSR Full-Path-Through Map-1 generation) according to the present embodiment. Route 5 is a 4F BLSR Full-Path-Through map.
[0061]
As an example of the protection map in the present invention, as shown in FIGS. 11, 12, and 13, since the protection maps do not switch at the same time, the routes are set so as to take the same route.
[0062]
Next, an example of an operation in the case of adding a BLSR configuration Normal map setting is shown in FIG. 14 showing an example of route determination of the present embodiment (4F when BLSR Normal Map-2 is set), and an example of route determination of the present embodiment (4F). FIG. 15 showing BLSR Span Bridge & Switch map-2 generation), FIG. 16 showing an example of route determination of this embodiment (4F BLSR Ring Bridge & Switch map-2 generation), and example of route determination of this embodiment FIG. 17 shows (4F BLSR Full-Path-Through Map-2 generation).
[0063]
In the case of the example shown in FIGS. 14 to 17, since the use rate of the route is also high, the route is rearranged in accordance with the above-described rule based on the flow chart showing the route determination algorithm of the present embodiment in FIG. Determine the optimal route.
[0064]
Next, FIG. 18 is a diagram for explaining a network system using an optical cross-connect device as an embodiment of the present invention. In FIG. 18, CORE indicates a capacity of 20 Gb / s, and PORT1 to PORT6 indicate units of capacity of 10 Gb / s, respectively.
VC3 / STS-1 is 50M bit / s 192ch
VC4 / STS-3c is 150M bit / s 64ch
VC4-4c / STS-12c is 600M bit / s 16ch
VC4-16c / STS-48c is 2.5G bit / s 4ch
VC4-64c / STS-192c is 10G bit / s 1ch
Are accommodated respectively.
[0065]
For the STM-64 / OC-192 and STM-16 / OC-48 interfaces, 1 + 1, 1: 1, 2 Fiber and 2 Fiber BLSR (Bidirectional Line Switched Ring) systems can be selected as line protection, and VC4-4c / STS- For the SDH / SONET interface of 12c or less, 1 + 1 and 1: 1 switching systems and SNCP path protection systems can be selected as line protection.
[0066]
According to the above-described embodiment, with the expansion of the cross-connect capacity, a plurality of hardware (H / W) having a switch function are provided, the map to be set is surface-managed, and the protection map for the normal map is internally separated. And a cross-connect device that can be set immediately when switching occurs due to the occurrence of a failure.
[0067]
When a map is set, a route is calculated, and if a route cannot be secured as it is, rearrangement is performed to determine an optimum route. However, the calculated Normal map and Protection map are hardware-based. When setting to (H / W), it is possible to perform control that does not affect a path in which switching has not occurred by executing relocation.
[0068]
Furthermore, at the time of route calculation, a Protection map is generated based on each Normal map, but the Br & Sw map and the Through map are programmed so that the same route is set as much as possible so as not to waste the route carelessly. Even when the traffic usage rate is high, an appropriate route can be determined.
[0069]
【The invention's effect】
According to the present invention, it is possible to immediately obtain an optimal setting state when switching occurs due to the occurrence of a fault, and to set each Normal map and Protection map calculated for route switching in hardware (H / W). A cross-connect system and a control method of the cross-connect system that have a high traffic usage rate without affecting the path in which switching has not occurred due to the execution of the rearrangement are realized.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram illustrating a cross-connect system and a control method of the cross-connect system according to the present invention.
FIG. 2 is a diagram showing a pattern that requires rearrangement of a map in the present invention.
FIG. 3 is a diagram showing a pattern that requires rearrangement of a map in the present invention.
FIG. 4 is a diagram showing a pattern that requires rearrangement of a map in the present invention.
FIG. 5 is a diagram showing a pattern that requires rearrangement of a map in the present invention.
FIG. 6 is a diagram showing a pattern which requires rearrangement of a map in the present invention.
FIG. 7 is a flowchart illustrating an algorithm of relocation control according to the embodiment of the present invention.
FIG. 8 is a flowchart illustrating an algorithm for determining a route according to the present embodiment.
FIG. 9 is a diagram illustrating an operation of determining a route according to the embodiment of the present invention.
FIG. 10 is a diagram illustrating an operation of determining a route according to the embodiment of the present invention.
FIG. 11 is a diagram for describing an operation of route determination in the embodiment of the present invention.
FIG. 12 is a diagram illustrating an operation of determining a route according to the embodiment of the present invention.
FIG. 13 is a diagram for describing an operation of route determination according to the embodiment of the present invention.
FIG. 14 is a diagram illustrating an operation of determining a route according to the embodiment of the present invention.
FIG. 15 is a diagram for describing an operation of route determination according to the embodiment of the present invention.
FIG. 16 is a diagram illustrating an operation of determining a route according to the embodiment of the present invention.
FIG. 17 is a diagram illustrating an operation of determining a route according to the embodiment of the present invention.
FIG. 18 is a diagram illustrating a network system using an optical cross-connect device as an embodiment of the present invention.
FIG. 19 is a diagram illustrating an example of a switch operation in a general 4-fiber BLSR system.
FIG. 20 is a diagram showing an example of switch operation in a general 4-fiber BLSR system.
FIG. 21 is a diagram illustrating an example of a switch operation in a general 4-fiber BLSR system.
FIG. 22 is a diagram illustrating an example of a switch operation in a general 4-fiber BLSR system.
FIG. 23 is a diagram illustrating an example of a switch operation in a general 4-fiber BLSR system.
FIG. 24 is a diagram showing an example of switch operation in a general 4-fiber BLSR system.

Claims (10)

A plurality of switch elements having a switch function of switching connection relations of a plurality of buses connected to the self according to given control information and having substantially the same configuration as hardware, and generating the control information A function unit for setting and managing the structure of the information transmission route formed by the plurality of switch elements and the plurality of buses in a planar manner based on a map representing the structure, and as the map At least a first map to be applied when a failure does not occur in the bus and a second map to be applied when a failure has occurred in the bus. When a failure occurs, an information transmission route based on the first map is stored. And a control element adapted to switch from the structure to the structure of the information transmission route according to the second map. ECTS system. The cross-connect system according to claim 1, wherein the switch element is configured to include firmware. The control element calculates a route calculation based on the structure of the information transmission route based on the first map. When it is calculated that the information transmission route cannot be secured as it is, the control element performs the calculation based on the second map. 2. The cross-connect system according to claim 1, wherein the optimal route is determined by rearranging to an information transmission route based on the structure of the information transmission route. A state corresponding to a calculation result of a route calculation based on the structure of the information transmission route based on the first map and / or a calculation result of a route calculation based on the structure of the information transmission route based on the second map; Is set in the switch element so that control is performed so as not to affect a bus in which the connection relation has not changed even if the rearrangement relating to the setting is executed. The cross-connect system according to claim 3, wherein: When calculating the route for the relocation, the control element is configured to minimize a change in the state of the plurality of switch elements that change the bus connection relationship and the through connection. The cross-connect system according to claim 3, wherein the cross-connect system is configured to execute a calculation. It has a switch function of switching the connection relationship between a plurality of buses connected to itself according to given control information, and is constituted by a plurality of switch elements having substantially the same configuration as hardware and the plurality of buses. A first map to be applied when at least a bus has not failed as the map, and a first map and a first map to be set and managed based on a map representing the structure. A second map to be applied when a failure occurs in the bus is prepared, and when a failure occurs, switching from the structure of the information transmission route based on the first map to the structure of the information transmission route based on the second map is performed. Characteristic cross-connect system control method. 7. The method according to claim 6, wherein a circuit including firmware is applied as the switch element. When a route is calculated based on the information transmission route structure based on the first map and a route cannot be secured as it is, rearrangement is performed to the information transmission route structure based on the second map to optimize The method of controlling a cross-connect system according to claim 6, wherein a route is determined. A state corresponding to the calculation result of the route calculation based on the structure of the information transmission route based on the first map and / or the calculation result of the route calculation based on the structure of the information transmission route based on the second map is stored in the switch element. 9. The cross-connect system according to claim 8, wherein when setting, control is performed so as not to affect a bus in which a change in the connection relationship has not occurred even if relocation related to the setting is executed. Control method. When calculating the route for the rearrangement, the calculation is performed so that a change in the state of the plurality of switch elements that change the connection relation of the bus and the one that connects through the connection is minimized. The control method for a cross-connect system according to claim 8, wherein

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