JPH05175983A - Atm exchange - Google Patents

Abstract

PURPOSE:To attain miniaturization and to reduce the cost by obtaining output PC and output VP information from input VC and input VP information of each input cell with a virtual channel(VC) converter and a virtual path(VP) converter so as to connect both the converters with one exchange switch. CONSTITUTION:A VC exchange function is designated through a subscriber line, a cell from a subscriber terminal equipment is inputted to a VC converter 1, in which a VC base is converted and the result is inputted to a common channel 3 for VC conversion. Furthermore, in the case of relay lien connection, a VP exchange function is designated, an input cell is inputted to a VP converter 2, in which VP conversion is implemented. The input cell is switched to a desired outgoing line based on outgoing VP information given by the converter 2 through the channel 3. When a cell from its own station is sent through a relay line, the input cell is given to the converter 2, from which output VP information is obtained and a cell with the outgoing VP information inserted thereto is outputted from the converter 2 to the channel 3, switched once to the converter and switched to the desired output line. Moreover, the input cell from the subscriber line to the relay line with the outgoing VC information inputted thereto is outputted to the channel 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cross connect (X
C) The present invention relates to an ATM switch for switching connection in a public network or a private network having a function. The switching connection includes a switching connection (virtual channel switching: VC switching) in a subscriber line switching system and a multiplexer (cross-connect switching system).
There is an exchange connection (virtual path exchange: VP exchange) in the above, but these tend to be miniaturized and reduced in cost year by year, and such a thing is required.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional broadband ISDN (B-IS).
DN) communication network, which is an example of a switching connection method in a public network or a private network having a cross-connect function in an ATM switching system.

In FIG. 7, reference numeral 52 is a cross-connect exchange, and each of these cross-connect exchanges 52.
Is a subscriber line exchange 5 that accommodates a plurality of terminals 6, respectively.
It is configured to be connected to 1. Further, the cross-connect exchanges 52 are connected by a relay line 41. Here, the subscriber line exchange 51 corresponds to a virtual channel (VC) exchange base, and controls exchange connection in a subscriber line.

The cross-connect exchange 52 corresponds on a virtual path (VP) exchange basis, controls exchange connection in the cross-connect, and is a multiplexer for multiplexing lines from the exchange. .. With such a configuration, when the terminals 6 between the other stations communicate with each other, first, the subscriber terminal switch 51 is transferred from the calling terminal 6.
The input cell is sent to. Then, the incoming virtual channel information (incoming VC) of the input cell is extracted from the input cell from the calling terminal 6 by the subscriber line exchange 51.
After that, output virtual channel information (output V
C) is inserted. Thereafter, the cell in which the outgoing virtual channel information is inserted is sent from the subscriber line exchange 51 to the cross-connect exchange 52.

Then, the cross-connect exchange 52
Extracts the incoming virtual path information of the received cell, inserts the outgoing virtual path information based on this, and further switches the cell to a desired outgoing line. At this time, the cross-connect exchange 52 multiplexes the outgoing line information sent from each cell and outputs the multiplexed information.

On the contrary, for each cell sent from the trunk line 41 to the cross-connect exchange 52, the incoming virtual path information is extracted and read by the cross-connect exchange 52. At this time, if these cells are relay connections, the outgoing virtual path information according to the incoming virtual path information is inserted and sent to the outgoing line on the predetermined station side according to this. Further, in the case where the own station is dropped, the outgoing virtual path information according to the incoming virtual path information is inserted into these cells, and after that, each cell is sent to the subscriber line exchange 51 of the own station. ..

Then, the cell sent to the subscriber line exchange 51 is converted into the output virtual channel information of the incoming virtual channel information possessed by the cell and falls to the subscriber line exchange 51. Further, the subscriber line exchange 51 is separated.
Each cell sent to the cell is inserted with the incoming virtual channel information instead of the incoming virtual channel information that the cell itself has, and then switched to the outgoing line of the predetermined terminal 6 according to this.

Further, in the case of communication between subscriber lines, the input cell sent from the terminal 6 to the subscriber line exchange 51 has the output virtual channel information inserted therein instead of the input virtual channel information possessed by itself. After that, switching is made to the outgoing line of the predetermined terminal 6 according to this.

[0009]

However, in such a conventional ATM switching system having a cross-connect function, a switching layer for performing a subscriber line switching process and a transmission having a trunk line cross-connect function are provided. Virtual channel exchange and virtual path exchange must be realized by independent devices in the system layer. That is, there is a problem that the ATM cost path for performing high-speed cell exchange must be independently provided in both layers, which causes an increase in equipment cost.

The present invention was devised in view of the above problems, and an ATM switching system in which both of these switching connections are connected by one switching switch, and the size and cost can be reduced. The purpose is to provide.

[0011]

FIG. 1 is a block diagram of the principle of the present invention. In FIG. 1, 3 is a common speech path, and this common speech path 3 is functionally arranged in parallel. It is connected to the channel converter 1 and the virtual path converter 2. Here, the virtual channel converter 1
Is for obtaining the output virtual channel information from the input virtual channel information of the input cell, and the virtual path converter 2 is for obtaining the output virtual path information from the input virtual path information of the input cell. ..

Further, the common speech path 3 switches the cell to a desired outgoing line based on the outgoing virtual channel information (outgoing line information) obtained by the virtual channel converter 1 and obtains it by the virtual path converter 2. The cell is switched to a desired outgoing line based on the outgoing virtual path information (outgoing line information) thus obtained. Reference numeral 4 is a common control device, and this common control device 4 controls the common communication path 3.

[0013]

In the above ATM switch of the present invention, as shown in FIG. 1, the virtual channel converter 1 obtains the output virtual channel information from the input virtual channel information of the input cell. Also, the virtual path converter 2
Thus, the output virtual path information can be obtained from the input virtual path information of the input cell.

Further, the cell is switched to a desired outgoing line by the common speech path 3 and the common control device 4 based on the outgoing line information obtained by the virtual channel converter 1, and at the same time, the cell is switched by the virtual path converter 2. Based on the obtained outgoing line information, the cell is switched to the desired outgoing line.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 2 is a block diagram showing an embodiment of the present invention. In FIG. 2, 5 is an ATM type private branch exchange (hereinafter, referred to as
This ATM switch 5 is composed of a virtual channel converter 1, a virtual path converter 2, a common speech path (degenerate ATM speech path) 3, and a common control device 4. The common speech path 3 commonly switches cells according to outgoing line information obtained by the virtual channel converter 1 and the virtual path converter 2.

Here, the virtual channel converter 1 is
A virtual channel-based converter for obtaining the output virtual channel information from the input virtual channel information of the input cell and inserting this into the cell, that is, a virtual channel-based converter for the input cell. Requires a required table (memory).

The virtual path converter 2 is for obtaining the output virtual path information from the input virtual path information of the input cell and inserting it into the cell, that is, a virtual path-based converter for the input cell. A required table (memory) is also used as the virtual path converter 2, but the table amount in this case is smaller than that of the virtual channel converter 1.

The common speech path 3 switches the cell to a desired outgoing line based on the routing information obtained by the virtual channel converter 1, and at the same time, switches the cell based on the routing information obtained by the virtual path converter 2. It switches to a desired outgoing line. That is, the common speech path 3 enables simultaneous control of the virtual channel switching function of the subscriber system and the trunk line switching function.

Further, the common control device 4 controls each of the above switching operations in the common communication path 3.
With such a configuration, in the case of the subscriber line, the virtual channel switching function is specified, and the cell (to be exact, the header portion of the cell) from the subscriber's terminal 6 is input to the virtual channel converter 1. ..

Then, the virtual channel converter 1 having received this input cell performs virtual channel-based conversion on the input cell. That is, the output virtual channel information is obtained from the input virtual channel information of the input cell, and this is inserted into this cell (header portion of the cell). After that, the cell that has obtained this outgoing virtual channel information is sent from the virtual channel converter 1 to the common speech path 3.

The input channel from the virtual channel converter 1 is subjected to virtual channel exchange by this common speech path 3 (see route in FIG. 3). Also, in case of trunk line connection, the virtual path exchange function is specified,
The input cell is sent to the virtual path converter 2. Then, the virtual path converter 2 that has received this input cell (header portion of the cell) performs virtual path-based conversion on the input cell. That is, the output virtual path information is obtained from the input virtual path information of the input cell, and this is inserted into the cell (header portion of the cell).

After that, the cell into which the outgoing virtual path information has been inserted is output to the common speech path 3, where the virtual path exchange for the trunk line is performed. That is, the input cell is switched to the desired outgoing line by the common speech path 3 based on the outgoing virtual path information given by the virtual path converter 2 (see the route in FIG. 4).

Further, when a cell which is dropped by the local station is sent from the trunk line 41, the virtual path converter 2 obtains the output virtual path information from the input virtual path information of the input cell. After this is inserted in place of the incoming virtual path information, the cell into which the outgoing virtual path information is inserted is sent from the virtual path converter 2 to the common speech path 3.

Further, the input cell sent to the common communication path 3 is temporarily switched to the incoming connection virtual channel converter 1 here, and the desired outgoing line (subscriber) is further based on the virtual channel information. (See the route in FIG. 5). When a cell is sent from the subscriber line to the trunk line 41, the virtual channel converter 1 obtains the output virtual channel information from the input virtual channel information of the input cell, and the input cell receives the input virtual channel information. The cell in which the outgoing virtual channel information is inserted after being inserted instead of the channel information is transmitted from this virtual channel converter 1 to the common channel 3
Sent to.

Then, this input cell is sent to the desired relay virtual path converter 2 based on the output virtual channel information given to the virtual channel converter 1 by the common speech path 3. Further, the input cell sent to the common communication path 3 is switched to a desired outgoing line (relay line 41) based on the outgoing virtual path information multiplexed and given to the virtual path converter 2 here. (See route in Figure 3).

The common control device 4 controls the above switching operation on the common communication path 3. Thus, in the ATM switch, the virtual channel converter 1 for obtaining the output virtual channel information from the input virtual channel information of the input cell and the virtual path converter 2 for obtaining the output virtual path information from the input virtual path information of the input cell And switching the cell to a desired outgoing line based on the outgoing virtual channel information obtained by the virtual channel converter 1, and determining the cell based on the outgoing virtual path information obtained by the virtual path converter 2. Since the common communication path 3 for switching to the desired outgoing line 3 and the common control device 4 for controlling the common communication path 3 are provided, in the broadband ISDN, the subscriber communication path and the switching connection for cross-connect are Can be implemented in a single ATM private branch exchange. . That is, as shown in FIG. 6 (A), two exchange communication paths 51 and 52 have been conventionally used, but by degenerating them, as shown in FIG. 6 (B), an ATM private branch exchange. It is possible to realize a system in which the function and the cross-connect function of the trunk line system can be performed by one switched communication path. As a result, it is possible to prevent an increase in the equipment cost in the ATM switching system of the public network and the private network having the cross connect function.

[0027]

As described in detail above, according to the ATM switch of the present invention, in the ATM switch, the virtual channel converter for obtaining the output virtual channel information from the input virtual channel information of the input cell and the input cell are provided. It has a virtual path converter that obtains outgoing virtual path information from incoming virtual path information, and switches the cell to a desired outgoing line based on outgoing virtual channel information obtained by the virtual channel converter and Since a common communication path for switching a cell to a desired outgoing line based on the obtained output virtual path information and a common control device for controlling the common communication path are provided, even one ATM switch can provide a cross-connect function. The required system can be realized,
There is an advantage that an increase in equipment cost can be prevented.

[Brief description of drawings]

FIG. 1 is a principle block diagram of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of one embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of one embodiment of the present invention.

FIG. 5 is a diagram illustrating the operation of the embodiment of the present invention.

FIG. 6 is a diagram illustrating an effect in one embodiment of the present invention.

FIG. 7 is a block diagram showing a conventional example.

[Explanation of symbols]

 1 Virtual Channel Converter 2 Virtual Path Converter 3 Common Call Path 4 Common Control Device 5 ATM Switch 6 Terminal 31 Virtual Channel Switch 32 Virtual Path Switch 41 Trunk Line 51 Subscriber Line Switch 52 Cross-Connect Switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuya Sakanishi 3-9-18 Shin-Yokohama, Kohoku Ward, Yokohama City, Kanagawa Prefecture Fujitsu Communication Systems Ltd.

Claims (1)

[Claims] 1. In an ATM switch, a virtual channel converter (1) for obtaining output virtual channel information from input virtual channel information of an input cell, and a virtual path for obtaining output virtual path information from input virtual path information of an input cell. A converter (2), and switches the cell to a desired outgoing line based on the outgoing virtual channel information obtained by the virtual channel converter (1). A common speech path (3) for switching a cell to a desired outgoing line based on the obtained outgoing virtual path information
And an common control device (4) for controlling the common communication path (3).