JP2000004247A - Device and method for transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the transfer speed of route connection data by shortening a transient switching state in the case of switching to a new route connection pattern on the occurrence of any fault or the like. SOLUTION: Concerning this transmission method, when the change request of the route connection pattern is generated, first of all, a CPU 108 selects any suitable pattern identifier for avoiding a fault while using an intra-device path 107 according to fault information and reloads contents in a pattern identifier storage register 105. Next, a route connection data control function part 104 reads the pattern identifier out of the pattern identifier storage register 105 while using a local bus 106. Next, the route connection data control function part 104 transfers the route connection data from a pattern storage register group 103 to route connection data storage register groups 171-180 according to the pattern identifier while using the local bus 106. Output side switch contacts 161-170 perform route connections according to the data written in the respective route connection data storage register groups 171-180.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission apparatus and a transmission method, and more particularly, to a transmission apparatus and transmission for forming a drop-and-insert type ring network in which a failure location is bypassed by changing a route connection when a failure occurs. About the method.

[0002]

2. Description of the Related Art First, a prior art relating to a route connecting portion will be described. Such a route connection unit is applied to a time division multiplex transmission device forming a drop-and-insert ring network. Conventionally, actual route connection is realized by using a general space-time switch function. Hereinafter, a control method of the conventional space-time switch will be described.

Conventionally, in order to control a switch, a method has been adopted in which switching data is written from a CPU directly to a register storing a switching pattern for controlling switching by using a bus in the apparatus. Switching method (The Institute of Electronics, Information and Communication Engineers) 43
Page See Figure 3.18 (b). ). In the route connection control, the route connection data corresponds to the switching data, and the storage function of the route connection data corresponds to the storage function of the switching pattern.

Next, ring path switching in a self-healing ring network will be described as an example in which a route connecting unit is applied to a network. Here, the route connection unit may be referred to as a path connection unit.

[0005] Ring path switching is generally applied to a network in which transmission devices having branching / inserting and passing type route connection functions are arranged in a ring shape (Japanese Patent Laid-Open No. 7-2).
12381 and the like. ). As an operation mode, a point-to-point transmission route is realized by setting a branch and an insertion path between two nodes on the ring, and setting a passing path at nodes arranged on the passing section. . In the ring network, due to the nature of the ring, 2
Two routes, that is, a clockwise route and a counterclockwise route, that connect points can be considered. In the self-healing ring, one of a clockwise direction and a counterclockwise direction is defined as a route in a normal state, and a route in a direction opposite to the normal direction used when a failure occurs is defined as a bypass route. As a result, even when a failure occurs, a signal transmission route can be secured by bypassing the failure occurrence section. The selection of the normal route or the detour route is realized by changing the route connection pattern for the route connection unit.

In general, as an example of a ring network, a 2-Fiber Bidirectional Line Switched Ring (2-Fiber Bidirectional Line Switched Ring)
Fiber BLSR), 4-Fiber Bidirectinal Line
Switched Ring (4-Fiber BLSR), Unidi
There is a rectional path switched ring (UPSR). In the following description, a network in which a ring network is formed by four nodes A to D will be described as an example.

FIG. 17 is an explanatory diagram of a 2-fiber BLSR network. 2-Fiber BLSR
Is a method in which each of the nodes A to D is connected by two lines, one of which is in use and the other is in use. FIG. 17 (A)
As shown in (1), in the normal path setting, the up and down passes through the same route (see the thick line). In FIG. 17 (B),
In such a network, for example, nodes AB
This shows a case where a failure has occurred in the line 10 or 11 between them. In this case, a path passing through the failure section is bypassed (ring switch) using the spare capacity in the opposite direction (see a thick line). At this time, it is the failure end nodes (nodes A and B in this example) that execute the ring switch. Other nodes execute relay processing.

FIG. 18 and FIG. 19 show 4-Fiber B
FIG. 2 shows an explanatory diagram of an LSR network. 4-Fiber
The BLSR provides a working line and a protection line, and connects each node with four lines (for example, between nodes AB)
The working lines 20 and 21 are connected to the protection lines 22 and 23). This network normally has a working line 20
In this method, traffic is rescued using the protection lines 22 and 23 when a failure occurs. As shown in FIG. 18, in a normal path setting, uplink and downlink transmission signals pass through the same path (see a thick line).

FIG. 19A shows a case where a failure occurs only in the working line 20 between nodes AB in such a network, for example. In this case, nodes A and B
The path passing through the faulty section is transmitted using the protection lines 22 and 23 (see the thick line). Further, as shown in FIG. 19B, when a failure occurs in both the working line and the protection line between the nodes A and B, the path passing through the failure section is bypassed to the protection line in the opposite direction (ring). Switch) (see bold line). It is the failure end nodes (the nodes A and B in this example) that execute such a span switch or ring switch. Other nodes execute the relay processing of the transmission signal.

FIG. 20 is an explanatory diagram of a UPSR network. As shown in FIG. 20A, in setting a normal path, the upstream and downstream pass through different routes (routes in the same direction). That is, the counterclockwise direction (Counter Clockwis
e, CCW) is the working path and is normally transmitted using the working path (see the thick line). On the other hand, clockwise (Clockwis
e, CW) are reserved. Here, as shown in FIG. 20 (B), a path is set for both the working and the protection, and the working side (CCW) is selected by the selector 31 or the like at the path end node in normal times. On the other hand, when a failure occurs between the nodes A and B, the path termination node recovers from the failure by selecting the protection side (CW) (see the thick line).

[0011]

Generally, a plurality of paths exist in one transmission line. In order to realize self-healing / ring path switching, detour routes are set for all paths for which a pass route has been set at the nodes at both ends of the faulty section at the same time. It is necessary to make a route connection in the opposite direction to the obstacle section.
Therefore, conventionally, in order to realize the ring path switching of the self-healing ring, it was necessary to instantaneously connect a large number of routes. When such a conventional switch control type route connection unit is combined with a self-healing ring node device, it is necessary to perform a large number of route connections using a bus in the device.

Therefore, when the conventional route connection control system is adopted, the following three problems may occur. That is, firstly, a large amount of data transfer is involved, so that the transfer process takes a long time. It is also used for internal monitoring and other control processing. Therefore, if route connection control with a large amount of data transfer is performed instantaneously using the internal bus, there is a possibility that such other traffic may be squeezed,
Third, when the route connection information is rewritten using the conventional method, the transition state of rewriting from the old route connection pattern to the new route connection pattern takes a long time as in the transfer process. thing.

In view of the above, the present invention achieves the following objects. That is, first, the transfer speed of the route connection data is reduced, second, the effect on the traffic of the internal bus during route connection control is reduced, and third, the old route connection pattern Is to reduce the switching transient state in which the switching from the switching to the new route connection pattern is performed.

[0014]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention employs the following configuration of a route connecting portion. First, the following configuration is provided inside the route connection unit. First, a pattern storage register group capable of storing two or more route connection data patterns is provided. Secondly, there is provided a pattern identifier storage register for storing a pattern identifier of a group of pattern storage registers for storing the currently used route connection data pattern. For these functions added here, for example, data can be written from a function unit different from the route connection unit via an internal bus.

The operation of the transmission apparatus and transmission method according to the present invention is as follows. First, a plurality of route connection data patterns are stored in advance in a group of pattern storage registers for storing the route connection data patterns. When there is a route control request to the transmission device, one of these normal or backup route connection patterns is designated. The route connection data pattern is provided with a pattern identifier for each group of patterns, and when specifying a normal or backup route connection data pattern, only this pattern identifier is specified.

A specific data transfer route at this time is as follows, for example. First, a pattern identifier storage register for storing a pattern identifier of a currently used route connection data pattern from a control unit (CPU) having a function of determining the necessity of changing the route connection by using an internal bus. , A pattern identifier of a new spare route connection data pattern is designated. Thereafter, the route connection is performed according to the newly set route connection data pattern. When such a procedure is taken, the data transferred between the CPU and the route connection unit via the internal bus is only a pattern identifier for designating a spare pattern. Because of this,
The route connection can be changed without squeezing traffic that normally uses the internal bus.

According to the first solution of the present invention, a switch unit for connecting an input route and an output route in accordance with a route connection data pattern stored in a route connection data storage register group; One of a pattern storage register group for storing normal and backup route connection data patterns for controlling the unit, and a pattern identifier corresponding to each route connection data pattern stored in the pattern storage register group. A pattern identifier storage register in which a pattern identifier is set, and a corresponding route connection data pattern is read from the pattern storage register group based on the pattern identifier set in the pattern identifier storage register. Route connection data control set in a route connection data storage register group in the switch unit To provide a transmission apparatus and a capacity unit.

According to the second solution of the present invention,
According to the route connection data pattern stored in the route connection data storage function, a switch function for connecting the input route and the output route, and a normal and backup route connection data pattern for controlling the switch function. Among the pattern storage functions to be stored and the pattern identifiers corresponding to the respective route connection data patterns stored in the pattern storage function,
Based on the pattern identifier storage function in which one of the pattern identifiers is set and the pattern identifier set in the pattern identifier storage function, a corresponding route connection data pattern is read from the pattern storage function, and the route connection data pattern A path connection data control function for setting a path connection data storage function in the switch function, and by rewriting a pattern identifier for the pattern identifier storage function, an input path and an output path. The present invention provides a transmission method adapted to perform a connection change.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Route Connection Portion FIG. 1 shows a configuration diagram of a route connection portion according to the present invention.
The route connection unit 101 according to the present embodiment includes a switch unit (switch function) 102 that actually performs route connection, a pattern storage register group (pattern storage function) 103, a route connection data control function unit 104, and a pattern identifier storage. A register (pattern identifier storage function) 105 and a local bus 106 inside the route connection unit 101 are provided. The route connection unit 101 includes an external control unit (CPU) 108, a main signal interface unit 109, and an internal clock processing unit 110.
Are connected to each other by an internal bus 107. The internal bus 107 includes, for example, the pattern storage register group 103.
And a pattern identifier storage register.

Next, a detailed configuration and operation of the route connection unit according to the embodiment of the present invention will be described. In this embodiment, the switch unit 102 includes switch inputs 121 to 121.
It has 130 inputs of 130 and switch outputs 131-1
It has 40 ten outputs. Switch part 1
02 includes route connection data storage register groups 171 to 180 for realizing a route connection data storage function. The route connection unit 101 of the time-division multiplexing apparatus has serial-parallel conversion functions 191 and 192 at the preceding stage and parallel-serial conversion functions 193 and 194 at the subsequent stage. Two time-division multiplexed data 195
And 196 are respectively provided with switch inputs 121 to 124 and 125 to 12 by serial / parallel conversion functions 191 and 192.
8 The switch outputs 131 to 134 and 135 to 138 are output from the parallel / serial conversion functions 193 and 194, respectively.
Is time-division multiplexed into two time-division multiplexed data 197 and 198. The switch inputs 121 to 130 are logical or physical input side switch contacts 151 to 160, respectively.
The switch outputs 131 to 140 have logical or physical output side switch contacts 161 to 170, respectively. The output side switch contacts 161 to 170 can be arbitrarily connected to the input side switch contacts 151 to 160. By connecting the output side switch contacts 161 to 170 and the input side switch contacts 151 to 160, logical or logical Ten physical routes 181 to 190 are configured.

The output-side switch contacts 161 to 170 perform route connection in accordance with the data written in the route connection data storage register groups 171 to 180, respectively. Here, the route connection data stored in the route connection data storage register groups 171 to 180 are treated as a set of route connection data patterns, and the route connection data patterns that can be predicted in advance are stored in the pattern storage register group 103. To register multiple patterns. In the present embodiment, the pattern storage register group 103 can store, for example, one normal route connection data pattern 111 and four spare route connection data patterns 112 to 115. A unique pattern identifier is assigned to each of the route connection data patterns registered in the pattern storage register group 103. In the present embodiment, the pattern identifiers corresponding to the route connection data patterns 111 to 115 are Simply, pattern identifiers “111” to “1” are respectively used.
15 ".

The pattern identifier storage function register 105 stores the pattern identifier of the currently operating route connection pattern among the route connection data patterns 111 to 115 registered in the pattern storage register group 103 in advance. . First, the route connection data control function unit 104
The pattern identifier of the route connection data pattern in operation is read from the pattern identifier storage register 105, and the route connection data pattern designated as operation by this pattern identifier is read from the pattern storage register group 103. Next, the route connection data control function unit 104
The read route connection data pattern is set in the corresponding route connection data storage register groups 171 to 180. still,
On the basis of the pattern identifier stored in the identifier storage register 105, the data may be directly transferred from the in-apparatus path 107 to the route connection data storage register groups 171 to 180 without passing through the pattern storage register group 103. .

The configuration of the transfer route of the route connection pattern data outside and inside the route connection unit 101 is as follows. First, the route connection unit 101 is connected to the internal bus 107 as an external interface. In the route connection unit 101, mainly the internal bus 107
The pattern identifier storage register 105 and the pattern storage register group 103 use the interface with. The in-apparatus bus 107 is also connected to each function unit of the entire apparatus, that is, each function outside the route connection unit 101.
In the present embodiment, it is connected to the CPU 108, the main signal interface unit 109, the internal clock processing unit 110, and the like.

Next, as the internal interface of the route connection unit 101, each function is connected to the local bus 106. The pattern storage register group 103, the route connection data control function unit 104, the pattern identifier storage register 105, and the route connection data storage register groups 171 to 180 are connected to the local bus 106. Local bus 106
Is a bus completely independent of the internal bus 107,
Independent control is possible. Also, this local bus 1
06 can be configured to be used only for the transfer of the route connection data inside the route connection unit 101 and the transfer of the control data. In the present embodiment, the local bus 10
The data transfer control of the route connection data control function unit 10
4 does.

Next, the sharing and operation of the transfer function of the route connection pattern data are as follows.

The internal bus 107 is used, for example, at the time of setting at the time of initial startup. That is, it is used when setting a route connection data pattern in the pattern storage register group 103, or when setting a pattern identifier in the pattern identifier storage register 105 when a request to change the route connection occurs. used. The CPU 108 installed outside the route connection unit 101
A monitoring control function in the transmission device controls each operation. On the other hand, the local bus 106 stores, for example, the pattern identifier storage register 1 of the route connection data control function unit 104.
It is used at the time of reading the pattern identifier from the pattern storage register 05, or at the time of transferring the route connection data from the pattern storage register group 103 to the route connection data storage register groups 171 to 180. The data transfer control of the local bus 106 is performed by the route connection data control function unit 104.

In practice, when a request to change the route connection pattern is issued, the transmission device first determines the occurrence of a fault and the fault location / situation by the CPU 108 based on the transmitted control channel / control information. Understand failure information. C
The PU 108 selects an appropriate pattern identifier for avoiding a failure by using the in-apparatus path 107 according to the failure information, and rewrites the contents of the pattern identifier storage register 105. Second, the route connection data control function unit 104
The pattern identifier is read from the pattern identifier storage register 105 using the local bus 106. Third, the route connection data control function unit 104 uses the local bus 106 to transfer the route connection data from the pattern storage register group 103 to the route connection data storage register groups 171 to 180 according to the pattern identifier. Do.
In this way, the route connection unit 101 disconnects the transfer of the route connection data from the internal bus 107 and
In the area 07, only the transfer of the pattern identifier, which is the data obtained by compressing the route connection data, is performed, and the traffic is compressed when the route connection is changed.

The pattern identifier storage register 105
For example, the Synchronous Digital Hierarchy (Synchr
onous digital hierarchy (SDH) signal, synchronized with the frame signal reception timing, or at the same frame signal reception timing within the device as the SDH signal frame, when the route needs to be changed periodically or when a failure occurs. Here, a pattern identifier corresponding to a route connection data pattern to be used can be written.

(2) 2-Fiber BLSR Ring Network Next, a transmission method related to ring path switching control will be described. Here, as an example, an example in which the self-healing ring is applied to ring path switching is shown.
In the following description, the above-described route connection unit 101 functions as a path connection unit in a ring network.

First, FIGS. 2 and 3 are explanatory diagrams of ring path switching in a general self-healing ring. Here, as an example, the simplest ring network 2
-A description will be given of the ring configuration of the Fiber BLSR.

As shown in FIG. 2A, the ring network 2
00 includes three transmission devices 201 to 203 as an example. Here, the transmission devices 201 and 202 are rotated clockwise.
And 203 are arranged in this order, and a network is constituted by a total of two routes, one route for transmitting data in the clockwise direction and one route for transmitting data in the counterclockwise direction. On the clockwise route, the transmission device 201
, A transmission path 211 between the transmission devices 201 and 202,
A transmission path 212 is disposed between the transmission apparatuses 202 and 203, and a transmission path 213 is disposed between the transmission apparatuses 203 and 201. On the counterclockwise route, a transmission path 223 between the transmission apparatuses 201 and 203, a transmission path 222 between the transmission apparatuses 203 and 202, and a transmission apparatus 202 starting from the transmission apparatus 201.
, And a transmission path 221 is arranged between them. Each of the transmission devices 201 to 203 has a transmission / reception transmission line for data outside the ring network. In the transmission device 201, an insertion transmission line 231 and a branch transmission line 241 are arranged. The transmission device 202 includes an insertion transmission line 232 and a branch transmission line 242. In the transmission device 203, an insertion transmission line 233 and a branch transmission line 243 are arranged.

FIG. 2B shows the transmission apparatus 2 in a normal state.
01 and the transmission device 202 starting from 01
2 illustrates an example of a route of a path between the transmission device 201 and the transmission device 203 during the transmission. In this example, the data transfer between the transmission devices 201 and 202 uses the transmission lines 211 and 221 that directly connect them,
The data transfer between the three is performed by a transmission line 21 that directly connects them.
3 and 223, a bidirectional path is set. Data is transferred from the transmission device 201 to the transmission device 202 from the insertion transmission line 231 of the transmission device 201 to the branch transmission line 242 of the transmission device 202 via the transmission line 211 that performs clockwise data transfer. Make a road connection. On the other hand, the transfer of data from the transmission device 202 to the transmission device 201 is performed through the insertion transmission line 232 of the transmission device 202.
The transmission is performed by connecting a route to the branch transmission line 241 of the transmission device 201 via the transmission line 221 that performs data transfer in the counterclockwise direction. The transfer of data from the transmission apparatus 201 to the transmission apparatus 203 is performed by the insertion transmission path 231 of the transmission apparatus 201.
From the transmission line 223 that performs data transfer in the counterclockwise direction.
Is connected to the branch transmission path 243 of the transmission apparatus 203 via the network. On the other hand, from the transmission device 203 to the transmission device 2
01 is transmitted from the insertion transmission line 233 of the transmission device 203 to the transmission line 2 performing clockwise data transmission.
13, the connection is made to the branch transmission path 241 of the transmission apparatus 201 by a route connection. By such a route connection, between the transmission devices 201 and 202, between the transmission devices 201 and 203,
All devices between the transmission devices 202 and 203 exchange data. In this route connection, normally, in the transmission device 202 and the transmission device 203, only the drop / insert path exists, and there is no transit path. Also, at normal times,
There is no data passing through the transmission paths 212 and 222.

FIG. 3A shows transmission apparatuses 201 and 202.
9 shows an example of a route of a path between the transmission apparatuses 201 and 202 when a failure occurs in the transmission path 211 or 221 between them. In this example, the transmission line 21 which is a faulty transmission line
By setting the paths of the transmission devices at both ends of the transmission path section, the paths 1 and 221 are bypassed to set bidirectional paths. Incidentally, the detour method performed by the transmission devices at both ends of the faulty transmission path section usually employs a method in which a path sent to the faulty section is turned back before the faulty section. Transmission device 20
1 from the transmission device 202 to the transmission device 202, a counterclockwise route is set from the insertion transmission line 231 of the transmission device 201, and the transmission device is transmitted via the transmission line 223, the transmission device 203, and the transmission line 222. Branch transmission line 2 of 202
This is realized by making a route connection to. Regarding the transfer of data from the transmission device 202 to the transmission device 201, a clockwise route is set from the insertion transmission line 232 of the transmission device 202, and the data is transmitted via the transmission line 212, the transmission device 203, and the transmission line 213. This is realized by making a route connection to the branch transmission line 241 of the device 201. still,
Normally, the route connection between the transmission apparatuses 201 and 203 that are performing a route connection unrelated to the failure section is not changed.

The data transfer between the transmission device 202 and the transmission device 203 is performed as follows. At this time, the change of the drop / insert path in the transmission device 203 is not performed. The data from the transmission device 202 to the transmission device 203 is first transmitted by the transmission device 202 to the transmission line 212 opposite to the faulty transmission line section. In the transmission device 203 receiving this data,
The path setting for transferring the data to the transmission apparatus 201 without branching is performed. The transmission apparatus 201 receives this data from the transmission path 213 and transmits the data to the transmission path 2 in the same direction as the input side.
23, a path to be sent back is set. In this case, as a transmission destination path at this time, a path in which data is transferred from the transmission device 202 to the transmission device 203 is normally used as it is. Thus, data transfer from the transmission device 202 to the transmission device 203 is realized.

On the other hand, from the transmission device 203 to the transmission device 202
Is transmitted to the transmission line 213 by the transmission device 203 in the same manner as in the normal state. The transmission apparatus 201 that has received the data sets a path for receiving the data from the transmission path 213 and returning the data to the transmission path 223 in the same direction as the input side. The transmission device 203 sets a path for transferring this data to the transmission device 202 as it is. That is, the reception path from the transmission path 223 and the transmission path to the transmission path 222 are connected. As a result, the transmission device 203 transmits the
A 02-direction data transfer is realized.

In the operation of each transmission device, the transmission device 2
In 01, the path exchanged between the transmission apparatus 203 and itself is not changed. The data transmission to the transmission device 202 and the data reception from the transmission device 202 are simply inserted and branched to a path newly set on the opposite side of the failure section. Data from the transmission device 203 to the transmission device 202 is
A path is set to receive the same path as the normal path in the transmission path 213 and transmit it to a new path in the transmission path 223, which is the transmission path on the original side, in a form to be folded back before the failure section. Data from the transmission device 202 to the transmission device 203 is transmitted over the transmission path 2
13 is set from the new path in FIG. 13 and transmitted to the same path as the normal path in the transmission path 223 which is the transmission path on the original side in such a manner that the faulty section is looped back.

In the transmission device 202, since the normally used transmission line cannot be used due to a failure, the route connection is changed so that the addition and dropping is simply performed on the opposite side of the device. The transmission apparatus 203 does not change the branch and the insertion from the normal state. However, a new pass path for transferring data from the transmission device 202 to the transmission device 201,
Path for transmitting data from the communication device 2 to itself, transmission device 2
01 for transmitting data from the transmission apparatus 201 to the transmission apparatus 202, and a transmission path for returning data from the transmission apparatus 201 for transmitting data from itself to the transmission apparatus 202;
Are newly added.

FIG. 3B shows transmission devices 201 and 203.
When a failure occurs in the transmission path 213 or 223 between
2 illustrates an example of a route of a path between the transmission devices 201 and 203. In this example, transmission line 2 which is a faulty transmission line
A bidirectional path is set in such a way that the paths 13 and 223 are bypassed by the path setting of both end devices in this transmission path section.
In addition, as a detour method performed by the devices at both ends of the faulty transmission path section, a method of returning a path to be sent to the faulty section immediately before the faulty section is used. From the transmission device 201 to the transmission device 2
As for the transfer of data to the transmission device 03, a clockwise route setting is performed from the insertion transmission line 231 of the transmission device 201, and the transmission line 203, the transmission device 202, and the transmission line 212 are connected. This is realized by making a route connection to H.243. From the transmission device 203 to the transmission device 2
01, a counterclockwise route is set from the insertion transmission line 233 of the transmission device 203.
This is realized by making a route connection to the branch transmission line 241 of the transmission device 201 via the transmission line 222, the transmission device 202, and the transmission line 221. Note that, at normal times, the transmission devices 201 and 202 performing route connection unrelated to the failure section
The route connection between them is not changed.

Data transfer between the transmission device 202 and the transmission device 203 is performed as follows. At this time, the branch and the insertion path in the transmission device 202 are not changed. Data from the transmission device 203 to the transmission device 202 is first transmitted by the transmission device 203 to the transmission line 222 on the opposite side of the faulty transmission line section.
Sent to The transmission device 202 that has received the data sets a path for transferring the data to the transmission device 201 without branching. The transmission apparatus 201 receives the data from the transmission path 221 and sets a path for returning the data to the transmission path 211 in the same direction as the input side. In this case, as a transmission destination path at this time, a path in which data is transferred from the transmission device 203 to the transmission device 202 is normally used as it is. Thereby, data transfer in the direction from the transmission device 203 to the transmission device 202 is realized.

On the other hand, from the transmission device 202 to the transmission device 203
Is transmitted to the transmission path 221 by the transmission device 202 in the same manner as in the normal case. The transmission apparatus 201 receives the data from the transmission path 221 and sets a path for returning the data to the transmission path 211 in the same direction as the input side. The transmission device 202 sets a path for transferring this data to the transmission device 203 as it is. That is, the reception path from the transmission path 211 and the transmission path to the transmission path 212 are connected. Thereby, data transfer from the transmission device 203 to the transmission device 202 is realized.

In the operation of each transmission device, the transmission device 2
In 01, the path exchanged between the transmission apparatus 202 and itself is not changed. The data transmission to the transmission device 203 and the data reception from the transmission device 203 are simply inserted and branched into a path newly set on the opposite side of the failure section. Data from the transmission device 202 to the transmission device 203
A path is set to receive the signal on the same path as the normal path in the transmission path 221 and transmit it to a new path in the transmission path 211, which is the transmission path on the original side, in a form to be folded back before the failure section. Data from the transmission device 203 to the transmission device 202 is transmitted over the transmission path 2
Then, a new path is received from the new path 22 and the path is set to be transmitted to the same path as the normal path in the transmission path 211 on the original side in a form in which the faulty section is looped back.

The transmission apparatus 202 does not change the branch and the insertion from the normal state. However, a new pass path for data transfer from the transmission apparatus 203 to the transmission apparatus 201, a pass path for data transfer from the transmission apparatus 203 to itself, and a new path for data transfer from the transmission apparatus 201 to the transmission apparatus 203. Passing path and transmission device 203 from itself
A new pass path, that is, a pass path of data returned from the transmission apparatus 201 for data transfer to the transmission apparatus, is newly added. In the transmission device 203, since the transmission line on the side normally used cannot be used due to a failure, the route connection is changed so that the branching and insertion are simply performed on the opposite side of the device.

As described above, in ring path switching, which is a protection method using a route connection function in a ring network, route connection data can be prepared in a pattern according to the type of failure occurrence. It is. In the case of a ring network composed of n devices, the route connection pattern to be prepared per device is, for example, 2-FiberB
In a network using LSR ring switching,
What is necessary is just to prepare at least n same number as the number of apparatus sections. The n patterns are values obtained from the sum of one standard pattern used at normal times and (n-1) patterns obtained by subtracting one section from the total number n of sections as patterns affecting section failure. In this embodiment, since the transmission network is a ring network composed of three transmission devices, a total of three route connection patterns should be prepared under the condition that bidirectional paths always pass through the same route. Good.

Next, FIG. 4 shows a detailed configuration diagram of the route connection unit constituting the ring network. Here, the transmission device 201 illustrated in FIG. 2A is described as an example. The transmission device 201 includes at least three interface units for transmitting and receiving signals. Functionally, the interface unit can be classified into two types. The first type of interface is responsible for transmitting and receiving signals to and from an adjacent transmission device on the ring network. In a transmission device constituting a ring network, there are two adjacent transmission devices, one at each end, that is, two devices in total. Therefore, the number of interface units for configuring the ring network is at least two per device. By convention, the two interface sections on the ring each have a West
These are called the side interface 301 and the east interface 302. The second type of interface unit is responsible for transmitting and receiving signals to and from an adjacent device outside the ring network. The number of adjacent devices outside the ring network is at least one. Therefore, the number of interfaces with the outside of the ring network is at least one per device. Conventionally, the interface unit with the outside of the ring network is called a tributary interface unit 303. A route connection unit 304 for determining a destination of received data is provided between at least three or more interface units.

Each interface unit has a transmitting interface and a receiving interface. In this example, the west side interface unit 301 includes the transmission side interface (WS) 311 and the reception side interface (WR) 32
One. The east side interface unit 302 has a transmission side interface (ES) 312 and a reception side interface (ER) 322. The tributary side interface unit 303 includes a transmission side interface (TS) 31.
3 and a receiving-side interface (TR) 323.

In the transmission device constituting the ring network, paths can be classified into the following three types. The first type is a thru (Thru) in which a signal received from an interface on the ring is transmitted to an interface on the other ring.
gh) pass. The second type is a drop path for transmitting a signal received from an interface on the ring to a tributary interface. The third type is an Add path for transmitting a signal received from a tributary interface to an interface on the ring. The add path and the drop path are an inflow path and an outflow path of data into the ring network, respectively. In this example, each interface on the ring network is described as the simplest model.
It is assumed that a through path and an add / drop path can be accommodated, and both a normal path and a backup path when ring switching is considered can be accommodated.

Each of the paths that can be accommodated is given a name for the following explanation at each interface. ES3
12 of the paths that can be accommodated, normal operation (working,
The through path from the WR 321 used at the time of working is called EST (W) 331. Among the paths that the ES 312 can accommodate, an add path from the TR 323 used during normal operation is called an ESA (W) 332. In the normal state, the transmission device 201 is transmitted from the transmission device 202 to the transmission device 2.
There is a through-path for transferring data to C.03. When a failure occurs in the transmission path 211 or 221,
A path that is turned back before the transmission lines 211 and 222 that are unusable transmission lines is required. Among the paths that can be accommodated by the ES 312, a failure occurs (protection, protect
ion), ER322 housed in place of WS311
Is referred to as EST (P) 333. ES
When a failure occurs among the paths that can be accommodated by the WS 312, the WS 31
Add pass from TR323 to be accommodated in place of 1
Called SA (P) 334. Of the paths that can be accommodated by the WS 311, the through path from the ER 322 used during normal operation is called WST (W) 335.

Further, among the paths that can be accommodated by the WS 311, an add path from the TR 323 used during normal operation is called a WSA (W) 336. In the normal state, the transmission device 201 establishes a through path for transferring data from the transmission device 203 to the transmission device 202 via the transmission path 213 or 223.
213 which is an unusable transmission path when a failure occurs in
And 223, a path to be turned back is required. WS3
When a failure occurs among the paths that can be accommodated by ES 11, ES 312
The through path from WR321 to be stored in place of
Called T (P) 337. Of the paths that can be accommodated by the WS 311, when a failure occurs, the T accommodated in place of the ES 312
The add path from R323 is called WSA (P) 338. Among the paths that can be accommodated by the TS 313, the drop path from the WR 321 is called TSD <W> 339. TS
Among the paths that the 313 can accommodate, the drop path from the ER 322 is called TSD <E> 340. The ten paths 331 to 340 are output paths from the transmission device.

Of the paths that the ER 322 can accommodate, the through path to the WS 311 used during normal operation is
(W) 341. Among the paths that can be accommodated by the ER 322, the drop path to the TS 313 used during normal operation is referred to as an ERD (W) 342. In the normal state, the transmission apparatus 201 sets the through path for transferring data from the transmission apparatus 203 to the transmission apparatus 202 to the transmission path 211 or 221.
If a failure occurs in the transmission path 211,
And the path before 221 is required. ER3
When a failure occurs among the paths that can be accommodated by the WR 22, the WR 321
ERT through pass to ES312 to be accommodated in place of
(P) 343. Of the paths that can be accommodated by the ER 322, when a failure occurs, the TS accommodated in place of the WR 321
The drop path to H.323 is called ERD (P) 344.
Of the paths that the WR 321 can accommodate, a through path to the ES 312 used during normal operation is called a WRT (W) 345.

Of the paths that can be accommodated by the WR 321, the drop path to the TS 323 used during normal operation is
(W) 346. In the normal state, the transmission device 20
In No. 1, when a failure occurs in the transmission path 213 or 223, a through path for transferring data from the transmission apparatus 202 to the transmission apparatus 203 is disabled.
A path that turns back before 23 is required. Among the paths that can be accommodated by the WR 321, when a failure occurs, the through path to the WS 311 accommodated in place of the ER 322 is set to the WRT (P).
347. Of the paths that the WR 321 can accommodate,
When a failure occurs, the TS 313 accommodated in place of the ER 322
Is referred to as WRD (P) 348. TR3
Among the paths that 23 can accommodate, an add path to WS 311 is called TRA <W> 349. Of the paths that can be accommodated by the TR 323, the add path to the ES 312 is TRA <
Call E> 350. The above 10 passes 341-350
Is the input path to the device.

Therefore, in the model of the present embodiment, the route connecting portion 3
Reference numeral 04 has ten inputs 341 to 350, and has a 10 × 10 switch function of connecting to ten outputs 331 to 340. The above is the description of the configuration of the transmission device configuring the ring network.

Next, with reference to FIGS.
The operation of the switch that realizes the ring path switching in the self-healing ring of the er BLSR method will be described.

FIG. 5 is an explanatory diagram of ring path switching showing route connection during normal operation. In this case, all interfaces can be used, and all paths on the working side are used. Therefore, the route connection pattern is as follows. There are two through paths. That is, WR
Connection from T (W) 345 to EST (W) 331 and E
This is a connection from RT (W) 341 to WST (W) 335. The drop paths are the following two. That is, WRD
(W) Connection from 346 to TSD <W> 339, and
Connection from ERD (W) 342 to TSD <E> 340. The add path is the following two. That is, TRA <
Connection from W> 349 to WSA (W) 336 and T
This is a connection from RA <E> 350 to ESA (W) 332. As described above, the transmission apparatus 201 performs the above six types of route connection.

FIG. 6 is an explanatory diagram of ring path switching showing route connection when a failure on the west side occurs. In this case, the west side interface unit 301 cannot be used, and the east side protection path is used instead of the west side working path. Therefore, the route connection pattern is as follows. There are two through paths.
That is, the connection from the ERT (P) 343 to the EST (W) 331, and the connection from the ERT (W) 341 to the EST (P) 333.
Connection to The drop paths are the following two. That is, the connection from ERD (P) 344 to TSD <W> 339, and the connection from ERD (W) 342 to TSD <E> 340
Connection to The add path is the following two. That is, the connection from TRA <W> 349 to ESA (P) 334,
And connection from TRA <E> 350 to ESA (W) 332. As described above, the transmission device 201
Make a street connection.

FIG. 7 is an explanatory diagram of the ring path switching showing the route connection when the east side failure occurs. In this case, the east side interface unit 302 cannot be used, and uses the west side protection path instead of the east side working path. Therefore, the route connection pattern is as follows. There are two through paths.
That is, the connection from WRT (W) 345 to WST (P) 337, and the connection from WRT (P) 347 to WST (W) 33.
5 connection. The drop paths are the following two.
That is, the connection from WRD (W) 346 to TSD <W> 339 and the connection from WRD (P) 348 to TSD <E> 34
0 connection. The add path is the following two. That is, the connection from TRA <W> 349 to WSA (W) 336 and the connection from TRA <E> 350 to WSA (P) 338
Connection to As described above, the transmission device 201
Make a street connection.

As described above, in the present invention, the ring path switching in the self-healing ring is realized by performing the route connection which is patterned for each type of the fault section in the normal operation.

FIGS. 8 and 9 are explanatory diagrams of a list of route connection data patterns to be prepared for realizing the ring path switching. FIG. 8 is an explanatory diagram of a list of route connections in each of the operation modes shown in FIGS.

Among them, the pattern identifier “111” is added to the route connection pattern in the normal operation shown in FIG.
And a pattern identifier “112” for the route connection pattern in the normal operation shown in FIG. 6, and a pattern identifier “113” for the route connection pattern in the normal operation shown in FIG. 7, respectively. ing.

FIG. 9 is an explanatory diagram of data stored in the pattern storage register group 103. This diagram shows the route connection list shown in FIG. 8 as the route connection unit 1 shown in FIG.
In this example, the data is expanded on the pattern storage register group 103, which is the memory No. 01, as data.

In this example, the pattern storage register group 10
3, the route connection pattern at the time of normal operation is used as the route connection data pattern 111;
The route connection pattern at the time of the occurrence of the west-side failure is set as the route connection data pattern 113, and the route connection pattern at the time of the occurrence of the east-side failure is set as the route connection data pattern 113. In the present embodiment, as an example, each pattern storage register group 1
A method is used in which the position of the output path is represented by the address position from the head of the storage area 03, and the position of the input path is represented by the content written therein.

The correspondence between the position of each data and the output path is as follows. That is, the addresses 1110, 1
Reference numerals 120, 1130, 1140, and 1150 are positions where the data of the input path connected to the output path EST (W) 331 is written. Address 1 of the second position from the top
111, 1211, 1131, 1141 and 1151
Is the position where the data of the input path connected to the output path ESA (W) 332 is written. Addresses 1112, 1122, 1132, and 1142 at the third position from the top
And 1152 are positions where the data of the input path connected to the output path EST (P) 333 is written. Addresses 1113, 1123, and 113 at the fourth position from the top
3, 1143 and 1153 are output path ESA (P)
This is the position where the data of the input path connected to 334 is written. Addresses 1114 and 11 at the fifth position from the top
24, 1134, 1144 and 1154 are positions where the data of the input side path connected to the output side path WST (W) 335 is written. Address 1 at the sixth position from the beginning
115, 1125, 1135, 1145 and 1155
Is the position where the data of the input side path connected to the output side path WSA (W) 336 is written. Addresses 1116, 1126, 1136, 1146 at the seventh position from the top
And 1156 are positions where the data of the input path connected to the output path WST (P) 337 is written. Addresses 1117, 1127, 113 at the eighth position from the top
7, 1147 and 1157 are output-side paths WSA (P)
This is the position where the data of the input path connected to 338 is written. Addresses 1118 and 11 at the ninth position from the top
28, 1138, 1148 and 1158 are positions where the data of the input path connected to the output path TSD <W> 339 is written. Then, addresses 1119, 1129, 1139, 1149 and 1 at the tenth position from the top
Reference numeral 159 denotes a position where the data of the input path connected to the output path TSD <E> 340 is written. As described above, the data for identifying the input path to be connected to each address is written in the pattern storage register group 103.

At the time of normal operation, the pattern identifier “111” is set in the pattern identifier storage register 105, and when the west side failure occurs, the pattern identifier “112” is set. When the east side failure occurs, the pattern identifier “111” is set.
113 ". Thereby, in each case, the addresses 1110 to 1119 and the address 1120 are set.
To 1129, and the data of the addresses 1130 to 1139 are stored in the route connection data storage register groups 171 to 18 respectively.
Set to 0. In this way, such a route connection unit is applied to the transmission device 201 in the 2 Fiber BLSR self-healing network 200.

Next, FIGS. 10 and 11 are explanatory diagrams of data of the pattern storage register group 103 in the transmission device 202 and the transmission device 203, respectively. These figures are
This is an example in which a route connection list is developed as data on a pattern storage register group 103 which is a memory of the route connection unit 101 shown in FIG. Here, the following names are given to the connection source and connection destination paths for convenience.

First, the path name of the transmission device 202 will be described. The west side of the transmission device 202 is connected to transmission lines 212 and 222, and the device closest to the west side is the transmission device 203. The east side is connected to the transmission lines 211 and 221, and the device closest to the east side is the transmission device 201. During normal operation (working), the transmission device 202 is a device at one end of the transmission lines 212 and 222 that are not used, and therefore uses only the east side. The path from the transmission apparatus 201 among the drop paths from the transmission path 211 is referred to as ERD <12> (W). Of the drop paths from the transmission path 211, the path from the transmission device 203 is called ERD <32> (W). Among the add paths to the transmission path 221, the path to the transmission apparatus 201 is designated as ESA <21>.
(W). The path to the transmission device 203 among the add paths to the transmission line 221 is referred to as ESA <23> (W).

When a failure occurs in the transmission line 213 or 223, a new through-path for transferring data from the transmission device 201 to the transmission device 203 is newly set in the transmission device 202. Of these, the receiving side of the path that once sends the transmission device 201 to the transmission device 201 using a normal path, and passes the signal folded back by the transmission device 201 to the transmission device 203 is referred to as ERT <23> (P). Call. Also in this,
The receiving side of the path inserted by the transmission device 201 is set to ERT <1
3> (P). Similarly, a through path for transferring data from the transmission device 203 to the transmission device 201 is newly set. Among them, the transmitting side of the path that passes the path from the transmission device 203 to the transmission device 201 as it is to the transmission device 201 is called EST <32> (P). In this, the transmitting side of the path branched by the transmission device 201 is called EST <31> (P).

Next, the path on the west side of the transmission device 202 will be described. Note that the west path of the transmission device 202 is used only as a backup path when a failure occurs. When a failure occurs in the transmission line 211 or 221 section, only the add and drop paths are used. Of the drop paths from the transmission path 222, the path from the transmission device 201 is called WRD <12> (P), and the path from the transmission device 203 is called WRD <32> (P).
The path to the transmission device 201 among the add paths to the transmission line 212 is called WSA <21> (P), and the transmission device 203
Is referred to as WSA <23> (P).

When a failure occurs in the transmission line 213 or the transmission line 223, a new through path for transferring data from the transmission device 203 to the transmission device 201 is newly set in the transmission device 202. Among these, the transmission side of the path which once transmits to the transmission apparatus 201 using the normal path once and passes through the transmission apparatus 203 the one folded back by the transmission apparatus 201 is referred to as WST <23> (P). Call. Also in this,
The transmission side of the path inserted by the transmission apparatus 201 is set to WST <1.
3> (P). Similarly, a through path for transferring data from the transmission device 203 to the transmission device 201 is newly set. Among these, the receiving side of the path through which the data is transferred from the transmission device 203 to itself to the transmission device 201 is referred to as WRT <32> (P). In this, the receiving side of the path branched by the transmission device 201 is referred to as WRT <31> (P). Transmission device 20
2 in the input transmission line 232 on the tributary side of
The add path to 01 is called TRA <201>. In the input transmission line 232 on the tributary side of the transmission device 202,
The add path to the device 203 is called TRA <203>.
In the output transmission line 242 on the tributary side of the transmission device 202, the drop path from the device 201 is set to TSD <201.
>. In the output transmission line 242 on the tributary side of the transmission device 202, the drop path from the device
D <203>.

Next, the path name of the transmission device 203 will be described. The west side of the transmission device 203 is connected to the transmission lines 213 and 223, and the nearest device on the west side is:
The transmission device 201. The east side is connected to the transmission lines 212 and 222.
The transmission device 202. During normal operation (working), the transmission device 203 is a device at one end of the transmission lines 212 and 222 that are not used, and therefore uses only the west side. Of the drop paths from the transmission path 223, the transmission device 201
Is referred to as WRD <13> (W). Transmission line 22
3, the path from the transmission device 202 is called WRD <23> (W). Of the add paths to the transmission line 213, the path to the transmission device 201 is set to WSA <3
1> (W). Among the add paths to the transmission line 213, the path to the transmission device 202 is called ESA <32> (W).

When a failure occurs in the transmission path 211 or the transmission path 221, a new through path for transferring data from the transmission apparatus 201 to the transmission apparatus 202 is newly set in the transmission apparatus 203. Of these, WRT <32> (P) designates the receiving side of the path, which itself once sends to the transmission device 201 using a normal path and passes through the transmission device 201 the one folded back by the transmission device 201. Call. Also in this,
The receiving side of the path inserted by the transmission device 201 is set to WRT <1
2> (P). Similarly, a new through path for transferring data from the transmission device 202 to the transmission device 201 is newly set. Among these, the transmitting side of the path through which the data is transferred from the transmission device 202 to itself to the transmission device 201 is referred to as WST <23> (P). Also, among these, the transmitting side of the path branched by the transmission device 201 is called WST <21> (P).

Next, the path on the east side of the transmission device 203 will be described. Note that the east side path of the transmission device 203 is used only as a backup path when a failure occurs. When a failure occurs in the sections of the transmission lines 213 and 223, only the add and drop paths are used. Of the drop paths from the transmission path 212, the path from the transmission device 201 is called ERD <13> (P), and the path from the transmission device 202 is called ERD <23> (P).
Of the add paths to the transmission line 222, the path to the transmission device 201 is called ESA <31> (P), and the transmission device 202
Is referred to as ESA <32> (P).

When a failure occurs in the transmission path 211 or the transmission path 221, a new through path for transferring data from the transmission apparatus 202 to the transmission apparatus 201 is newly set in the transmission apparatus 203. Among them, the transmission side of the path which once sends to the transmission apparatus 201 by using the normal path and passes through the transmission apparatus 201 to the transmission apparatus 202 is called EST <32> (P). Call. Also in this,
The transmission side of the path inserted by the transmission device 201 is set to EST <1
2> (P). Similarly, a new through path for transferring data from the transmission device 202 to the transmission device 201 is newly set. Among them, the receiving side of the path through which the data is transferred from the transmission apparatus 202 to the transmission apparatus 201 as it is is referred to as ERT <23> (P). In this, the receiving side of the path branched by the transmission device 201 is called ERT <21> (P). Transmission device 20
3 in the input transmission line 233 on the tributary side.
The add path to 01 is called TRA <201>. In the input transmission line 233 on the tributary side of the transmission device 203,
The add path to the device 202 is called TRA <202>.
In the output transmission line 243 on the tributary side of the transmission device 203, the drop path from the device 201 is set to TSD <201.
>. In the output transmission line 243 on the tributary side of the transmission device 203, the drop path from the device 202
D <202>.

In the transmission apparatus 202, the pattern identifier 111 is set in the pattern identifier storage register 105 during normal operation, and the pattern identifier 112 is stored in the transmission path 213 or 22 when a failure occurs in the transmission path 211 or 221.
When three failures occur, the pattern identifier 113 is set.
Thus, in each case, the address 111
Data of 0 to 1119, addresses 1120 to 1229, and addresses 1130 to 1139 are set in the route connection data storage register groups 171 to 180, respectively. In this way, such a route connection is provided by a 2-Fiber BLS.
R transmission device 20 on self-healing network 200
Apply to 2.

The following assignment is made to the output route of the transmission device 202 as the address of the spare pattern storage register. The address for storing the input side path connected to ESA <23> (W) is address 1110,
1120 and 1130. The address storing the input path connected to ESA <21> (W) is address 1
111, 1211, and 1131. EST <31>
The addresses for storing the input paths connected to (P) are addresses 1112, 1122, and 1132. EST
<32> Addresses for storing the input side path connected to (P) are addresses 1113, 1123, and 1133. The addresses storing the input side paths connected to WSA <23> (P) are addresses 1114, 1124 and 11
34. The addresses storing the input-side paths connected to WSA <21> (P) are addresses 1115 and 1125.
And 1135. The address for storing the input path connected to WST <13> (P) is address 1116,
1126 and 1136. WST <23> (P)
The addresses that store the input-side paths connected to are 1117, 1127 and 1137. TSD <20
Addresses for storing the input side path connected to 3> are addresses 1118, 1128 and 1138. TSD <
201> is an address that stores the input path connected to
Addresses 1119, 1129 and 1139.

In the transmission device 203, the selection of the route connection pattern corresponding to each fault is the same. In this way, the above-described route connection unit is connected to the 2-Fiber BL.
Transmission device 2 on SR self-healing network 200
Apply to 03. Note that the output route of the transmission device 203 according to the present embodiment is allocated as the address of the spare pattern storage register as follows. That is, ES
The addresses storing the input paths connected to A <32> (P) are addresses 1110, 1120 and 1130. The addresses storing the input side paths connected to the ESA <31> (P) are the addresses 1111, 1121 and 11.
31. The addresses storing the input-side paths connected to EST <12> (P) are addresses 1112, 1122
And 1132. The address storing the input side path connected to EST <32> (P) is address 1113,
1123 and 1133. The address that stores the input path connected to WSA <32> (W) is address 1
114, 1124 and 1134. WSA <31>
The addresses storing the input-side paths connected to (W) are addresses 1115, 1125 and 1135. WST
The addresses storing the input-side paths connected to <21> (P) are addresses 1116, 1126, and 1136. The addresses storing the input side paths connected to WST <23> (P) are addresses 1117, 1127 and 1
137. The addresses storing the input side paths connected to the TSD <201> are addresses 1118, 1128 and 1138. The addresses for storing the input-side paths connected to the TSD <202> are addresses 1119 and 11
29 and 1139.

(3) 4-Fiber BLSR and UP
SR ring network In addition, the present invention can be similarly applied to a 4-fiber BLSR self-healing ring network and a UPSR network having a redundant configuration in a transmission path between transmission devices.

In the case of the 4-fiber BLSR, the failure modes include a single failure of the active system in the transmission line section and a failure of both the working and protection systems in the transmission path section. Detour path is different. Below, 4-Five
An outline in the case of r BLSR will be described.

First, in the event of a single system failure in a transmission line section, 1 + 1 switching from the working line to the protection line is performed. This allows
In the event of a single system failure in the transmission path section, it is possible to rescue the traffic of the entire ring network only by changing the setting of the path closed to both end devices in the failure section. On the other hand, when both systems fail in the transmission path section, ring switching is performed in the same way as in the case of 2-Fiber BLSR. In this case, it is necessary to change the path setting in all devices in the ring. Therefore,
The number of spare route connection patterns to be prepared in advance is
When the number of transmission devices forming the ring network is n, at least 4n- (2 × 2) transmission devices are required.

The details of the number of patterns will be described below. First, considering ring switching, the number of patterns may be simply n, which is the number of path setting patterns for the number of transmission devices constituting the ring network. However, in this method, since the 0 system and the 1 system can be independently selected at both ends of the transmission device, (1)
West side 0 system selection and East side 0 system selection, (2) West side 1 system selection and East side 0 system selection, (3) West side 0 system selection and East side 1 system selection, and (4)
West side 1 system selection and East side 1 system selection, total 4
One pattern is required. Accordingly, the path setting patterns for ring path switching have variations corresponding to four types of 1 + 1 switching, and are 4n types.

Further, considering a case where a failure has occurred in a transmission line nearest to the transmission device, in this case, it is not necessary to consider a combination between transmission lines on both sides of the transmission device. That is,
It has only two variations, (1) selection of 0 system and (2) selection of 1 system. That is, when a failure in the nearest transmission path of the transmission device occurs, the number of variations caused by 1 + 1 switching may be smaller by two as compared with other failures. In addition, there are two transmission paths nearest to the device, the west side and the east side. Therefore, from Equation 4n in consideration of the variation due to the 1 + 1 switching for each path setting pattern corresponding to the ring path switching, the extra 2 in the variation at the time of the nearest transmission path failure of the device (0 system / 1 system)
× 2 (waist / east) minus several minutes, that is, (4n
It is only necessary to prepare at least 2 × 2) path setting patterns.

FIGS. 12 and 13 show 4-Fiber BL.
FIG. 4 is an explanatory diagram of SR ring path switching. FIG. 12 (A)
As shown in FIG. 1, this ring network is a 4-fiber BLSR composed of four transmission devices A, B, C and D.
It is an example of a ring network. The difference between the 4-fiber BLSR and the 2-fiber BLSR is that two lines, up and down, between each transmission device have a redundant configuration of 0 system and 1 system. FIG. 12B shows a flow of data from the transmission device D to the transmission device C in a normal state. In this example, in the normal state, the system 0 transmission path is selected in all transmission path sections. In this example, the transmission path between the transmission devices C to D is not used in normal times.

FIG. 13A shows a flow of data from the transmission device D to the transmission device C when a failure occurs only in the 0 system of the transmission devices A and B. In this case, 0
Only the system 1 is selected between the transmission apparatuses A and B in which the system failure has occurred, and the same data transfer as in the normal state is performed in the other transmission path sections. At this time, the switching of the ring path is not performed. FIG. 13B shows the flow of data from the transmission device D to the transmission device C when a two-system fault occurs between the transmission devices B to C. in this case,
The path from the transmission device D to B via A is the same as in the normal case, except that the transmission device B at one end of the failure section
The ring is switched in the direction in which it is folded back. The path returned by the transmission device B is further transmitted to the transmission device A,
It reaches the transmission device C via the transmission device D.

FIGS. 14 and 15 show 4-Fiber B
FIG. 3 is an explanatory diagram of a list of route connection data patterns of an LSR ring network. The route connection data pattern in this case is shown in FIG.
4 and FIG. 15 as a set. As an example, 4-Fib
er shows a list of data set in a register group for storing route connection data patterns in the transmission device A on the BLSR ring network. FIG.
FIG. 3 is an explanatory diagram of an output path symbol and an input path symbol of a route connection data pattern of a Fiber BLSR ring network.

FIGS. 14 and 15 show the 2-Fi signals shown in FIG.
It corresponds to a data list in the case of ber BLSR.
In these figures, input paths connected corresponding to output paths are shown. As shown in FIG. 14, there are four types of connection patterns in a normal state, that is, a combination in which a system 0 or a system 1 is selected for each of the west side and the east side.
Since the west side is not selected as the pattern at the time of the failure between the transmission devices A and B, there are two combinations of selecting the system 0 or the system 1 only on the east side.

As shown in FIG. 15, similarly, there are two types of patterns when a failure occurs between the transmission devices DA, that is, a combination in which the 0-system or 1-system only on the west side is selected. As a pattern at the time of a failure between the transmission apparatuses BC, the transmission apparatus A has four combinations of combinations in which the system 0 or the system 1 is selected for the west side and the east side, respectively.

Further, in the UPSR ring network, the transmission function is to copy and insert data in advance in both the working and standby directions, so that the operation of the drop side (reception side) transmission apparatus is performed by the UPSR ring network. There is a feature of. Specifically, the input from the transmission line in the opposite direction to the transmission line in the normal state is dropped by the selection circuit such as the selector of the reception side transmission device. On the other hand, when a failure occurs in the working transmission line, the input from the same direction as the transmission side transmission line is dropped.

For example, in the case of a UPSR ring network composed of four transmission devices A, B, C, and D, the following is considered, considering the route connection data pattern in the transmission device A. First, a failure between the transmission devices AB, a failure between the transmission devices BC, a failure between the transmission devices CD, and a transmission device DA
There are four types of obstacles in between. Then, in the transmission device A, in response to each of these failures, a pattern indicating whether to use the transmission path in the clockwise direction or the counterclockwise direction for communication with each of the transmission devices B to C is provided. is necessary. Therefore, it is sufficient to prepare four kinds of route connection data patterns for such four kinds of faults. That is, in the case of the UPSR ring network, at least the route connection information group used in normal times and the route connection information for the number of sections of the route connection information group used when a failure occurs are stored in advance. I just need.

[0087]

According to the present invention, the following remarkable effects can be obtained as described above. That is, firstly, it is possible to reduce the transfer speed of the route connection data, secondly, at the time of route connection control, it is possible to reduce the influence on the traffic of the internal bus, and thirdly,
It is to be able to reduce the transitional transition state of switching from the old route connection pattern to the new route connection pattern.

[0088]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a route connection unit according to the present invention.

FIG. 2 is an explanatory diagram (1) of ring path switching in a general self-healing ring.

FIG. 3 is an explanatory view (2) of ring path switching in a general self-healing ring.

FIG. 4 is a detailed configuration diagram of a route connection unit forming a ring network.

FIG. 5 is an explanatory diagram of ring path switching showing route connection during normal operation.

FIG. 6 is an explanatory diagram of ring path switching showing route connection when a failure on the west side occurs.

FIG. 7 is an explanatory diagram of ring path switching showing route connection when a failure on the east side occurs.

FIG. 8 is an explanatory diagram (1) of a list of route connection data patterns.

FIG. 9 is an explanatory diagram (2) of a list of route connection data patterns.

FIG. 10 is an explanatory diagram of data of a pattern storage register group 103 in the transmission device 202.

11 is an explanatory diagram of data of a pattern storage register group 103 in the transmission device 203. FIG.

FIG. 12 is an explanatory diagram (1) of ring path switching of 4-Fiber BLSR.

FIG. 13 is an explanatory diagram (2) of ring path switching of 4-Fiber BLSR.

FIG. 14 is an explanatory diagram (1) of a list of route connection data patterns of a 4-fiber BLSR ring network.

FIG. 15 is an explanatory diagram (2) of a list of route connection data patterns of the 4-Fiber BLSR ring network.

FIG. 16 is an explanatory diagram of an output path symbol and an input path symbol of a route connection data pattern of a 4-Fiber BLSR ring network.

FIG. 17 is an explanatory diagram of a 2-Fiber BLSR network.

FIG. 18 is an explanatory diagram (1) of a 4-Fiber BLSR network.

FIG. 19 is an explanatory diagram (2) of a 4-Fiber BLSR network.

FIG. 20 is an explanatory diagram of a UPSR network.

[Explanation of symbols]

 Reference Signs List 101 route connection unit 102 switch unit 103 pattern storage register group 104 route connection data control function unit 105 pattern identifier storage register 106 local bus 107 internal bus 108 CPU 109 main signal interface unit 110 internal clock processing unit 111 normal Route connection data pattern 112-115 Spare route connection data pattern 121-130 Switch input 131-140 Switch output 151-160 Input side switch contact 161-170 Output side switch contact 171-180 Route connection data storage register group 181- 190 Route 191 192 Serial-parallel conversion function 193 194 Parallel-serial conversion function 195-198 Time-division multiplexed data 200 Ring network 201-203 Transmission device 211-213, 221-223 Transmission line 2 1 to 233 Insertion transmission path 241 to 243 Branch transmission path 301 West interface section 302 East interface section 303 Tributary interface section 304 Route connection section 311 to 313 Transmission interface 321 to 323 Receiving interface 331 to 340 Transmission path 341 to 350 Receiving path 1110 to 1159 Address 1401 to 1404 Return path

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K031 AA02 AA04 CA08 CB12 DA11 DA12 DA19 DB01 DB10 DB14 EA09 EB02 EB05 EB08 5K035 AA03 EE01 LL18

Claims (7)

[Claims] 1. A switch unit for connecting an input route and an output route according to a route connection data pattern stored in a route connection data storage register group, and a normal and spare switch for controlling the switch unit. A pattern storage register group for storing a route connection data pattern; and a pattern identifier storage in which any one of the pattern identifiers is set among the pattern identifiers corresponding to the respective route connection data patterns stored in the pattern storage register group. A register and a corresponding route connection data pattern are read from the pattern storage register group based on the pattern identifier set in the pattern identifier storage register, and the route connection data pattern is stored in the route connection data storage register in the switch unit. A transmission device comprising: a route connection data control function unit to be set in a group. 2. A drop-and-insert type transmission device constituting a 2-Fiber BLSR ring network, wherein an input route and an output route are determined according to a route connection data pattern stored in a route connection data storage register group. A switch unit to be connected; a normal route connection data pattern used in normal times as a route connection data pattern for controlling the switch unit; A pattern storage register for transmitting at least the number of spare route connection data patterns for bypassing the faulty section in the transmission path in the opposite direction to the path not used in the normal direction and for bypassing the faulty section And a pattern identifier corresponding to each of the working and backup route connection data patterns stored in the pattern storage register group. Any of the pattern identifiers is set, and when a failure of the ring network occurs, after specifying the failure occurrence section, the spare route connection data pattern stored in the pattern storage register group is selected. A pattern identifier storage register in which a pattern identifier corresponding to a spare route connection data pattern bypassing the faulty section is selected and set, and based on the pattern identifier set in the pattern identifier storage register, A method for reading a corresponding spare route connection data pattern and setting the spare route connection data pattern in a route connection data storage register group in the switch unit to switch to a path connection bypassing the faulty section. 2-Fiber BLSR provided with a road connection data control function unit
Drop-and-insert type transmission device that constitutes the ring network. 3. A drop-and-insert type transmission apparatus constituting a 4-fiber BLSR ring network, wherein an input route and an output route are determined according to a route connection data pattern stored in a route connection data storage register group. A switch unit to be connected, a normal route connection data pattern used in normal times as a route connection data pattern for controlling the switch unit, and a fault transmission used when a single active transmission line fault occurs. A spare route connection data pattern for switching the information route passing through the path section to a spare transmission path that is transmitted in parallel with the working transmission path, and passing through a failure section used when both the working and protection system transmission path failures occur And the spare route connection data pattern for bypassing the faulty section by transmitting information to the spare transmission path in the opposite direction to the normal A pattern storage register group for storing 4 × −2 × 2, and one of pattern identifiers corresponding to each of the working and backup route connection data patterns stored in the pattern storage register group are set. When a failure of the ring network occurs, after the faulty section is specified, the spare route bypassing the faulty section is selected from the spare route connection data patterns stored in the pattern storage register group. A pattern identifier storage register in which a pattern identifier corresponding to the road connection data pattern is selected and set; and, based on the pattern identifier set in the pattern identifier storage register, the corresponding spare route connection data from the group of pattern storage registers. Read the pattern and use this spare route connection data pattern as the route connection data in the switch unit. 4-Fiber BLSR that includes a route connecting the data control function for switching the path connection that bypasses the faulty segment by setting over data storage registers
Drop-and-insert type transmission device that constitutes the ring network. 4. A drop-and-insert type transmission device constituting a UPSR ring network, comprising: a switch for connecting an input route and an output route according to a route connection data pattern stored in a route connection data storage register group. Unit, as a route connection data pattern for controlling the switch unit, used in normal times, a normal route connection data pattern to drop the input from the transmission line having the same direction as the transmission side transmission line, A pattern storage register group for storing at least the number of spare route connection data patterns used for dropping an input from a transmission line having a direction opposite to the transmission side transmission line to be used when a failure occurs in the working transmission line, Any one of the pattern identifiers corresponding to the current and backup route connection data patterns stored in the pattern storage register group When a ring network failure occurs, a faulty section is specified, and after the faulty section is specified, the faulty section is bypassed from the spare route connection data patterns stored in the pattern storage register group. A pattern identifier storage register in which a pattern identifier corresponding to a spare route connection data pattern to be selected is selected and set. Based on the pattern identifier set in the pattern identifier storage register, a corresponding spare A route connection data control for reading a route connection data pattern and setting this spare route connection data pattern in a group of route connection data storage registers in the switch unit to switch to a path connection bypassing the faulty section. A drop-and-insert type transmission device constituting a UPSR ring network having a functional unit. 5. A switch unit for connecting an input route and an output route according to route connection data stored in a route connection data storage register group, and a route connection data pattern for controlling the switch unit. A normal route connection data pattern used in normal times to function as a drop-and-insert type transmission device configuring a 2-Fiber BLSR ring network;
A spare route connection data pattern for transmitting information passing through the faulty section used in the event of a fault in a transmission path in the opposite direction to normal and to a path not used in normal times to bypass the faulty section A first pattern storage register group for storing at least the number of transmission line sections of the ring network, and a drop-and-insert type that constitutes a 4-Fiber BLSR ring network as a route connection data pattern for controlling the switch unit. It has a normal route connection data pattern used in normal times to function as a transmission device, and is used when a single active transmission line failure occurs. A spare route connection data pattern for switching to a spare transmission line for parallel transmission, and passing through a failure section used when both the working and standby transmission lines fail. And a spare route connection data pattern for bypassing the faulty section by transmitting information to the spare transmission path in the opposite direction to the normal state, at least four times the number of transmission path sections of the ring network-2 x 2 A second pattern storage register group to be stored, and used as a route connection data pattern for controlling the switch unit, in normal times to function as a drop-and-insert type transmission device constituting a UPSR ring network. A normal route connection data pattern that drops an input from a transmission line having the same direction as the transmission side transmission line, and a transmission having a direction opposite to the transmission side transmission line used when a failure occurs in the working transmission line. A third pattern storage register group for storing at least the number of spare route connection data patterns for dropping an input from a road, and the first to third pattern storage register groups Any one of the stored pattern identifiers corresponding to the working and backup route connection data patterns is set, and if a ring network fault occurs, after the faulty section is specified, A pattern corresponding to a spare route connection data pattern that bypasses a failure section from among the spare route connection data patterns stored in the first to third pattern storage register groups according to the type of the ring network. A pattern identifier storage register in which an identifier is selected and set; and a corresponding spare route connection data pattern from the first to third pattern storage register groups based on the pattern identifier set in the pattern identifier storage register. Read, and set this spare route connection data pattern in the route connection data storage register group in the switch unit. By Rukoto, 2-Fiber BLSR, 4-Fibe
r A transmission device including a route connection data control function unit for switching to a path connection that bypasses a faulty section in accordance with one of the ring networks selected from the BLSR and UPSR ring networks. 6. The pattern identifier storage register includes: a synchronous digital hierarchy;
hierarchy, SDH) The route connection data pattern to be used when the timing is synchronized with the frame signal reception timing of the signal or the frame signal reception timing in the apparatus having the same cycle as the frame of the SDH signal, when the route needs to be changed periodically or when the route needs to be changed. The transmission apparatus according to claim 1, wherein a pattern identifier corresponding to the transmission is written. 7. A switch function for connecting an input route and an output route in accordance with a route connection data pattern stored in a route connection data storage function, and a normal and spare device for controlling the switch function. A pattern storage function for storing a road connection data pattern, a pattern identifier storage function in which any one of the pattern identifiers is set among the pattern identifiers corresponding to the respective route connection data patterns stored in the pattern storage function, Based on the pattern identifier set in the pattern identifier storage function, a corresponding route connection data pattern is read from the pattern storage function, and this route connection data pattern is set in the route connection data storage function in the switch function. A path connection data control function, and a pattern identification function for the pattern identifier storage function. A transmission method in which the connection between an input route and an output route is changed by rewriting a child.