JP2758697B2 - Multi-stage connection switch device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an ATM cell switching device. In particular, the present invention relates to routing information processing means in switches connected in multiple stages.

〔Overview〕

According to the present invention, in the routing information processing means of the multi-stage connection switching device, at the time of switching, the contents of the output route designation area are exchanged by the second switch to which only the routing information is input, so that the initial setting and circuit configuration Can be simplified.

[Conventional technology]

Conventionally, in this type of multistage connection switch, output route information to be referred to by the switch of the corresponding stage is set in a time slot assigned in advance to each stage or in an area fixed in each stage, and the switch of each stage is set. Have performed switching at appropriate timings or with reference to different areas.

Also, in the multistage connection switch, each time the switch passes through the switch, the first two of the addresses in the routing information output route designation area are set by the passing switch.
A technique for rotating bits has been proposed (Japanese Patent Publication No. 59-501034).

[Problems to be solved by the invention]

In the conventional method in which the switch-dedicated area of each stage is fixed, the timing or area referred to by the switch of each stage is different. Must be recognized in advance, and therefore there is a disadvantage that the initial setting and the circuit become complicated.

In the technique of rotating the first two bits of the address described above, cell data and routing information are not physically separated, and the format of the exchange packet and trunk packet is exchanged between input and output of a multistage switch. Since it is necessary to perform mutual conversion and add a control signal to a header, there is a problem that switching efficiency is reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-stage connection switch device which can easily set initial routing information, has a simple circuit configuration, and is suitable for high-speed operation.

[Means for solving the problem]

The present invention relates to a multi-stage connection switch device in which self-routing switches are connected in multiple stages, in which routing information created from header information of ATM cells is input by a signal line separated from an input signal line of cell data. The output route designation information corresponding to the self-routing switch of each stage includes output route designation information that is self-routing information switched by the self-routing switch of each stage of the self-routing switch configuring the multi-stage connection switch device, The self-routing switch of each stage inputs the routing information and the cell data, and stores the cell data in the output route designated by the output route designation information stored in the output route designation area designated by the inputted routing information. The first self-routing switch that outputs Only the routing information is input, the routing information is output to the output route designated by the output route designation information stored in the output route designation area designated by the inputted routing information, and the routing information is designated. A second self-routing switch that replaces the output route designation information stored in the output route designation area with the output route designation information corresponding to the self-routing switch of the next stage. The routing switch indicates the same output route designation area at the time of switching.

Here, the routing information stores output route designation information corresponding to the self-routing switch of each stage according to the switching order in the multistage connection switching device, and the second self-routing switch includes:
The output route designating information corresponding to the self-routing switch of each stage is circulated and the output route designating information stored in the designated output route designating area is output to the output route corresponding to the self-routing switch of the next stage. It may be replaced with the specified information.

[Action]

The routing information and the cell data are input to the self-routing switch of each stage through separated signal lines. The routing information includes a plurality of output route designation information corresponding to the self-routing switches of each stage constituting the multi-stage connection switch device, and the self-routing switches of each stage are stored in the designated output route designation area. Switching is performed based on the output route designation information. The first self-routing switch of the self-routing switch of each stage inputs the routing information and the cell data, and switches and outputs the cell data based on the routing information. The second self-routing switch receives only the routing information and performs switching based on the routing information, and outputs the output route designation information stored in the output route designation area designated at that time to the next stage of self-routing. It outputs the routing information replaced with the output route designation information of the switch. The same operation is performed in the self-routing switches in the next and subsequent stages. At this time, the same output area designation area is designated by the self-routing switch of each stage.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment.
As shown in FIG. 1, a self-routing switch 10 for 4 × 4 ATM cells includes a first switch 11 for switching ATM cell data and a second switch 12 for switching routing information of the ATM cell, which will be described later. The self-routing switch 10 switches ATM cell data and routing information to be described later by the first switch 11 and the second switch 12, respectively. 111, 121, 131 and 141 are cell data corresponding to input routes 1, 2, 3 and 4, respectively, and 112, 122, 132 and 142 respectively correspond to input routes 1, 2, 3 and 4 Routing information. Cell data is sent to the first switch 11, and routing information to be described later is sent to the first switch 11 and the second switch 12.
Is input to Reference numerals 1111, 1121, 1131 and 1141 denote cell data output from the first switches corresponding to the output routes 1 ', 2', 3 'and 4', respectively.
Reference numerals 22, 1132 and 1142 denote routing information to be described later output from the second switches respectively corresponding to the output routes 1 ', 2', 3 'and 4'. FIG. 4 shows a 16 × 16 configuration in which the self-routing switches shown in FIG.
3 is a block diagram of the three-stage switch of FIG. The 4 × 4 self-routing switches 10, 20, and 30 are connected in three stages. 401 to 416 and 501 to 516 are an input termination unit and a header conversion and routing information creation unit of a subscriber line interface corresponding to each line for each of the input routes 1 to 16,
Reference numerals 601 to 616 denote output terminating units of the subscriber line interface corresponding to individual lines for the respective output routes 1 'to 16'. This 501-5
With 16 header conversion and routing information creation units,
An output route that creates routing information for all stages of the multistage switch from the header information of the cell data to be input, and indicates an output route to be routed by the switches of each stage constituting the multistage switch as shown in FIG. The designation information is sequentially set according to the order in which the designation information is connected to the output route designation area in multiple stages. The routing information created in this way is the first
As shown in the drawing, the cell data 111, 121, 131, and 141 are physically separated from the input signal lines, and are input to the multistage switch through the input signal lines for the independent routing information 112, 122, 132, and 142. This routing information can secure information up to the length of one cell of cell data.

In this embodiment, as shown in FIG. 1 and FIG. 4, self-routing switches 10, 20, and 30 to which routing information is input together with cell data from an input path are connected in multiple stages. Each of 20 and 30 is provided with a first switch 11 to which the routing information and the cell data are inputted and which switches and outputs the cell data based on the contents of the output routing area included in the routing information, A second switch 12 to which only the routing information corresponding to the data is inputted and which switches and outputs the routing information based on the contents of the output route designation area included in the routing information. Further, as a characteristic feature of the present invention, when the self-routing switch to which the own switch belongs is switched by the second switch 12, the second switch 12 includes an output method included in the routing information to be output to the input path of the next-stage self-routing switch. In this configuration, the output route designation information, which is the contents of the route designation area, is exchanged. As described above, the switches of each stage of the present invention are such that both the first switch 11 and the second switch 12 are switched with the same routing information, the first switch 11 switches and outputs cell data, and the second switch 12 Then, the routing information is switched and output, and each output becomes an input of the next-stage switch. At this time, the information related to the routing included in the routing information is replaced with the output route designation information to be switched by the next-stage switch.

Next, the operation of this embodiment will be described. First, FIGS. 2 and 3 show how the contents of the output route designating area are exchanged by the second switch 12 when switching the routing information. FIG. 2 shows the routing information input to the second switch 12, and the selection of the output route of the switch is determined by the contents of the output route designation area indicated by the timing. FIG. 2 shows an example in which a three-stage switch as shown in FIG. 4 is considered. After the output route designation area, the output route designation information PA2 for the second stage switch and the output method for the third stage switch are shown. Although the route designation information PA3 continues, switching is determined by the contents of the output route designation area indicated by the timing, so here, switching is performed by PA1, and at that time, the contents of the output route designation area are also replaced. Will be FIG. 3 shows the replaced switch output. FIG. 3 shows an example in which the switching is performed by rotation. The routing information in which the contents of the output route designation area indicated by the timing are switched from PA1 to PA2 before switching is output to the output route indicated by PA1. You.
The exchange of the contents of the output route designation area is performed each time switching is performed in each stage. Therefore, in the second-stage self-routing switch 20, the content of the output route designation area is
The cell information and the routing information are switched based on the input routing information as PA2, and at this time, the contents of the routing information output route designation area are PA3.
And outputs the result to the third-stage self-routing switch 30. As described above, in the present invention, the switches of each stage connected in multiple stages allow the switches of all stages to change the contents of the output route designation area at the same timing without being aware of the order of the switch. Reference may be made, and all switches in each stage may perform the same operation.

〔The invention's effect〕

As described above, the present invention uses the same configuration and operation when switches are connected in multiple stages by exchanging the area specifying the output route in the routing information of the ATM cell at the time of switching. There is an effect that can be done. In addition, since the second switch to which only routing information physically separated from cell data is inputted, the output route designation information of the routing information is replaced without changing the format of the cell data, the switching is performed. There is an advantage suitable for high speed without lowering the efficiency.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a partial configuration of an embodiment of the present invention. FIG. 2 is a timing chart of switch input. FIG. 3 is a time chart of switch output. FIG. 4 is a block diagram showing the overall configuration of the embodiment of the present invention. 10, 20, 30 ... self-routing switch, 11 ... first switch, 12 ... second switch, 111, 121, 131, 141,
1111, 1121, 1131, 1141 ... Cell data, 112, 122, 13
2, 142, 1112, 1122, 1132, 1142 ... routing information, 401 to 416 ... subscriber line interface input termination unit,
501-516: Header conversion and routing information creation unit; 601-616: Subscriber line interface output termination unit.

Claims (2)

(57) [Claims] 1. A multi-stage connection switch device in which self-routing switches are connected in multiple stages, wherein routing information created from header information of ATM cells is inputted by signal lines separated from cell data input signal lines. The information is output route designation information corresponding to each stage of the self-routing switch, the output route designation information being self-routing information switched by the self-routing switch of each stage of the self-routing switch constituting the multi-stage connection switch device. The self-routing switch of each stage receives the routing information and the cell data, and specifies an output method designated by output route designation information stored in an output route designation area indicated by the inputted routing information. The first self-routine that outputs cell data to the path A switch, to which only the routing information is input, and to output the routing information to an output route designated by the output route designation information stored in the output route designation area indicated by the inputted routing information; A second self-routing switch that replaces the output route designation information stored in the output route designation area indicated by the information with the output route designation information corresponding to the self-routing switch in the next stage. A multi-stage connection switch device, wherein all the self-routing switches indicate the same output route designation area at the time of switching. 2. The routing information stores output route designation information corresponding to self-routing switches of each stage according to an order of switching in the multi-stage connection switching device. The output route designating information corresponding to the self-routing switch of each stage is circulated and the output route designating information stored in the designated output route designating area is output to the output route corresponding to the self-routing switch of the next stage. The multi-stage connection switching device according to claim 1, wherein the multi-stage connection switching device is replaced with designated information.