JPH04215345A - Connectionless communication system and switching node applied to the same - Google Patents

Abstract

PURPOSE:To construct a profitable system by performing connectionless service among a terminal, a line, and a network by arranged terminal housing means, line housing means, and network housing means. CONSTITUTION:VP1/VC1 that is a header addressed to the CLM of respective cell is attached on transmission CL data from an ATM terminal 12 to the terminal B 11, and it is sent out to an ATM terminal housing module 32, and is transferred to a connectionless service module CLM 60 via an ATM switch 50. At the CLM 60, the VP1/VC1 addressed to the CLM 61 of the switching node which houses the terminal B11 that is a destination is indexed. and header conversion is performed at high speed. The cell to which the header conversion is applied is transferred to the CLM 61, and is transferred to a LAN housing module 31 via a switch 51. The cell is assembled in CL data at a cell assembling/disassembling circuit 313. When the terminal is the one connected to a LAW (B) 21, the CL data is transmitted to the terminal B11.

Description

[Detailed description of the invention]

0001

0001

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to connectionless communication systems, and more particularly to connectionless communication systems in switching systems.

0003

0002

0004

2. Description of the Related Art Conventional switching networks do not have a connectionless communication service function, but simply provide a data exchange function, such as a packet exchange function. Therefore, when performing connectionless communication in a conventional switched network, a gateway device is installed outside the switched network (exchange), and a LAN (Local Area Net)
This gateway device converts the connectionless communication signal of the work) into the protocol of the switching network, passes it through the switching network, sends it to the partner gateway device, and converts it back to the LAN protocol in the partner gateway device. connectionless communication between the two.

[0005]

FIG. 2 is a system configuration diagram showing an example of a configuration of conventional connectionless communication. In the figure, ENET is a switching network, EXN is a switching node, GW is a gateway device,
LAN is a local area network and PVC is a permanent virtual call connection. LAN(A)
~ A plurality of terminals are connected to the LAN (C).

[0006]

[0004] If you want to perform connectionless communication from a terminal on LAN (A) to a terminal on LAN (B),
Transmit data is sent from the terminal connected to A) onto the LAN (A). When this transmission data is received by the gateway device (A), it undergoes protocol conversion as shown in FIG. 5, and is converted into a protocol used in the switching network. Gateway equipment and exchanges are permanent
A virtual call connection is made, and the protocol-converted data is sent within the switching network to the other party's gateway device (B), where it is converted to the other party's LAN protocol and connected to the LAN (B). sent to the other party's terminal.

[0007]

[0005]

[0008]

[Problems to be Solved by the Invention] However, in such conventional technology, when performing connectionless communication,
Because the gateway device must perform protocol conversion, it takes time to perform the protocol conversion, and since the exchange network uses a store-and-forward method similar to packet exchange, it takes time to transfer the data, and there is no data transfer between computers. The problem is that it is not suitable for applications that require high-speed data transfer, such as communications or broadband ISDN. Also, as the number of LANs and the number of connectionless terminals directly connected to the switching network increase, the gateway device becomes
Since it is required for each N or connectionless terminal, there is also the problem that it becomes difficult to construct an economically efficient system.

[0009]

The present invention eliminates the drawbacks of the prior art and provides a highly economical connectionless communication method that enables high-speed data transfer and does not require a gateway device for terminal/LAN compatibility, and is applicable to this communication method. The purpose is to provide an exchange node that

0010

[0007]

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention accommodates any or more of a terminal, a line, and a network, and performs communication between switching nodes by connectionless communication via a ring. The exchange node includes a switch means for switching input cells, a connectionless service means connected to the switch means and providing a connectionless communication service, and a switch means connected to the switch means and connected to a ring, and an interface with the ring. and a ring interface means for accommodating a terminal, a line accommodating means for accommodating a line, and a network accommodating means for accommodating a network, respectively, as necessary. A connectionless connection service is provided between terminals, lines, and networks by means of the terminal accommodating means, line accommodating means, and network accommodating means arranged.

0012

Further, according to the present invention, there is provided a connectionless communication system for a communication network connected to the switching node described above, which accommodates one or more of terminals, lines, and networks, and performs connectionless communication via a ring. Among the terminals, for those terminals that request a connectionless communication service, the terminal is terminated in advance at the terminal accommodation means, and the connection between the terminal accommodation means and the connectionless service means is semi-fixed via a switch means corresponding to the terminal. Then, a connectionless connection service is provided by a connectionless service means.

[0013]

Further, according to the present invention, there is provided a connectionless communication system for a communication network connected to the switching node described above, which accommodates one or more of terminals, lines, and networks and performs connectionless communication via a ring. Among the lines, for lines that require connectionless communication service, the line is terminated in advance at the line accommodation means, and the line accommodation means and the connectionless service means are semi-fixedly connected via switch means in a line-compatible manner. Then, a connectionless connection service is provided by a connectionless service means.

[0014]

Further, according to the present invention, there is provided a connectionless communication system for a communication network connected to the switching node described above, which accommodates any or more of terminals, lines, and networks and performs connectionless communication via a ring. The network accommodating means that accommodates the network terminates the network signal, converts the network signal into a predetermined signal, semi-fixedly connects the network accommodating means and the connectionless service means via the switch means, and provides the connectionless service. A connectionless connection service is provided by means.

[0015]

Further, according to the present invention, there is provided a connectionless communication system for a communication network connected to the switching node described above, which accommodates one or more of a terminal, a line, and a network and performs connectionless communication via a ring. In this system, a plurality of distributed switching nodes are connected by a ring, and connectionless communication is performed on the ring by connecting a plurality of distributed switching nodes with each other via the ring, and connecting the switching nodes with each other through the ring.
A connectionless connection service is provided within the switching node.

[0016]

Further, according to the present invention, there is provided a connectionless communication system for a communication network connected to the switching node described above, which accommodates any or more of a terminal, a line, and a network and performs connectionless communication via a ring. In this system, a plurality of distributed exchange nodes are connected by a ring, a connectionless service means is installed in a predetermined exchange node, and the connectionless service means, terminal accommodation means, line accommodation means, and network accommodation means of each exchange node are connected. A connectionless connection service is provided by making a semi-permanent connection.

[0017]

[0013]

[0018]

[Operation] According to the present invention, when a connectionless communication service is requested to an exchange node, the terminal accommodating means if the request is made from a terminal, or the line accommodating means if the request is made from a line. , in the case of a network, each terminal is terminated by a network accommodation means, and these accommodation means and connectionless service means are semi-fixedly connected via a switch means for a terminal, a line, or a network, and a connection is established. To perform a connectionless connection service using a wireless service means.

[0019]

[0014]

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the connectionless communication system according to the present invention will be described in detail with reference to the accompanying drawings.

[0021]

FIG. 1 shows a configuration diagram showing an embodiment of a communication network system to which a connectionless communication method according to the present invention is applied. In the communication network system in this embodiment, a plurality of exchange nodes EXN are connected to a RING device in a loop via an access unit AU that controls transfer between rings. The exchange node EXN is connected to LAN, ATM (Asynchronous
s Transfer Mode) terminal, ATM public network or STM (Synchronous Transfer Mode) terminal, ATM public network or STM (Synchronous Transfer Mode)
er Mode) An exchange node to which a public network etc. can be connected, and a building block type communication network can be formed by this exchange node EXN.

[0022]

[0016] The exchange node EXN includes a module CMM that performs call processing and maintenance operations that semi-fixably sets VPI/VCI, which is a header addressed to the CLM, and a module CMM that performs self-routing using the header VPI/VCI set by the module CMM. ATM switch module AS
M, a connectionless service module CLM that performs a connectionless communication server function, and a RING interface module RIM that performs communication between switching nodes via a ring device are provided. exchange node EXN
In addition, when accommodating an ATM terminal, an ATM terminal accommodating module AIM that accommodates an ATM terminal, and when accommodating a LAN, a LAN accommodating module LIM that accommodates a LAN, and when connecting to an ATM public network, When the ATM-UNI interface module AUM, which connects with the ATM network, is connected to the STM public network, the ST
Each STM-UNI interface module SUM that connects to the M network is connected to an ATM switch module A.
Connected to SM.

[0023]

FIG. 3 is a diagram showing in detail an embodiment of connectionless communication between LANs, and connectionless communication between LANs in this embodiment will be explained using the same figure.

[0024]

Terminal A connected to LAN (A) 20
Terminal B11 connected from 10 to LAN (B) 21
In the case of connectionless communication to terminal A10, communication CL (connectionless) data from terminal A10 to terminal B11 is L
It is sent out on AN(A) 20. In the LIM 30, a layer 1 termination circuit 301 receives CL data, and a MAC bridge circuit 302 performs filtering. If the destination terminal is not connected to LAN (A) 20, this CL
The data is passed through and sent to the cell disassembly and assembly circuit 303. The cell disassembly and assembly circuit 303 disassembles the CL data into cells of adaptation layer type 4 (AAL type 4), which is a cell format for connectionless communication as shown in FIG. VC
I and AS from the ATM interface circuit 304.
M50 is self-routed by VPI/VCI and CL
Transfer to M60. In the CLM 60, an ATM interface circuit 601 receives the cell, and a cell buffer circuit 602 buffers the cell. In the buffered cells, the destination address (DA) is extracted from the first cell of the CL data by the control circuit 604. The DA translation circuit 605 then converts the DA to the destination terminal (B).
) 11 is the VP addressed to CLM61 of the switching node that accommodates
The I/VCI is indexed and the new VPI/VCI and MID, which is a multiplexing identifier, are written into the header conversion table of the header conversion circuit 603. The header conversion circuit 603 indexes a header conversion table using the VCI/MID of the cell from the cell buffer circuit 602, and converts the header to a new VPI/VCI and MID at high speed using a hardware circuit.

[0025]

The cells that have undergone header conversion are transferred from the ATM interface circuit 601 to the ASM 50, RIM 70,
AU80, RING90, AU81, RIM71, AS
It is path routed through M51 and transferred to CLM61. In the CLM 61, the ATM interface circuit 611 receives the cell, and the cell buffer circuit 612 buffers the cell. The buffered cells are controlled by control circuit 614.
The destination address (DA) is extracted from the first cell of the CL data, and the DA translation circuit 615 extracts the destination address (DA) from the first cell of the CL data.
LIM (B) accommodating the destination terminal (B) 11 from A
) 31 is indexed. Then, the new VPI/VCI and MID of this cell are written into the header conversion table of the header conversion circuit 613. In the header conversion circuit 613, the voltage of the cell from the cell buffer circuit 612 is
Index the header translation table by CI/MID and add the new V
High-speed header conversion between PI/VCI and MID using hardware circuit. The cell whose header has been converted is transferred from the ATM interface circuit 611 to the ASM 51 as VPI/VC.
It is self-routed by I and transferred to LIM31. In the LIM 31, the ATM interface circuit 314 receives the cell. The received cell is sent to the cell disassembly and assembly circuit 3
C from the cell in the cell disassembly and assembly circuit 313.
It is assembled into L data. The assembled CL data is filtered by the MAC bridge circuit 312. If the destination of this CL data is a terminal connected to the LAN (B) 21, the CL data is sent from the L1 interface circuit 311 onto the LAN (B) 21, and the CL data is transmitted to the terminal B11. In this way, the CL is transmitted from the terminal A10 connected to the LAN (A) 20 to the terminal B11 connected to the LAN (B) 21.
Data communication is performed.

[0026]

Similarly, FIG. 4 shows a detailed example of connectionless communication between a connectionless ATM terminal and a LAN.
Explain using.

[0027]

[0021] From the connectionless ATM terminal 12
In the case of connectionless communication to terminal B11 connected to AN(B) 21, from ATM terminal 12 to terminal B11
The CL data sent to the ATM terminal 12 is adapted to the adaptation layer type 4 (AAL type 4), which is a cell format for connectionless communication as shown in FIG.
is decomposed into cells. Then, in each cell, CLM
The destination header VPI/VCI is added, and AIM3
2 is sent out. In the AIM 32, the sent cell is received by the layer 1 termination circuit 321, self-routed from the ATM interface circuit 324 to the ASM 50 by VPI/VCI, and transferred to the CLM 60. In the CLM 60, the ATM interface circuit 601 receives the cell, and the cell buffer circuit 602 buffers the cell. The destination address (DA) of the buffered cells is extracted from the first cell of the CL data by the control circuit 604. Then, in the DA translation circuit 605, the CL of the switching node accommodating the destination terminal (B) 11 is transferred from the DA.
The VPI/VCI addressed to M61 is indexed and the new VP
The I/VCI and MID, which is a multiplexing identifier, are written into the header conversion table of the header conversion circuit 603. The header conversion circuit 603 indexes the header conversion table using the VCI/MID of the cell from the cell buffer circuit 602, and uses the new VPI/VCI and MID.
A hardware circuit converts the header into an ID at high speed.

[0028]

The cells that have undergone header conversion are transferred from the ATM interface circuit 601 to the ASM 50, RIM 70,
AU80, RING90, AU81, RIM71, AS
It is routed through M51 and transferred to CLM61. In the CLM 61, the ATM interface circuit 611 receives the cell, and the cell buffer circuit 612 buffers the cell. The destination address (DA) of the buffered cell is extracted from the first cell of the CL data by the control circuit 614, and the destination address (DA) is extracted from the DA by the DA translation circuit 615. B)3
1 VPI/VCI is indexed and its new VPI/V
The CI and MID are written into the header conversion table of the header conversion circuit 613. The header conversion circuit 613 indexes the header conversion table using the VCI/MID of the cell from the cell buffer circuit 612, and uses the new VPI/VCI and MID.
A hardware circuit converts the header into an ID at high speed. The cell whose header has been converted is transferred from the ATM interface circuit 611 to the LIM 31 through self-routing through the ASM 51 using the VPI/VCI. In the LIM 31, an ATM interface circuit 314 receives cells and sends them to a cell disassembly and assembly circuit 313, where the cells are assembled into CL data. The CL data assembled into CL data is filtered by the MAC bridge circuit 312, and if the terminal is connected to the LAN (B) 21, the CL data is sent from the L1 interface circuit 311 onto the LAN (B) 21. Terminal B
CL data is transmitted to 11. From the terminal A10 connected to the LAN (A) 20 in this way, the LA
Communication of CL data to terminal B11 connected to N(B)21 is carried out.

[0029]

In the same way as the connectionless communication between LANs shown in FIG. 3 and the connectionless communication between ATM terminals and LAN shown in FIG.
Connectionless communication between the M line and the ATM terminal and between the ATM line and the LAN can also be performed in the same way. Further, similarly to the STM line of the STM network, connectionless communication is possible using the STM-UNI interface module SUM. Note that in this embodiment, VPI/VCI
is a method that is semi-fixed in advance from CMM 40 and 41, and MID is set as VPI/VC for each CL data.
It is set uniquely within I.

[0030]

[0024]Also, in the above embodiment, an example was shown in which the communication passes through the CLM twice, but in the case of communication that is closed within the exchange node, the system passes through the CLM once. Also, in communication across exchange nodes, if there is a CLM in some exchange node,
Connectionless communication is possible by using only that CLM.

[0031]

[0025]

[0032]

As described in detail above, by placing an ATM-based connectionless server device in a switching node, a gateway device for terminal/LAN correspondence is no longer necessary, and an economical system can be constructed. In addition, by using ATM-type cell switching technology in connectionless server equipment, high-speed data exchange in connectionless communications can be performed using hardware.
A high-throughput, connectionless communication method can be provided.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a communication network showing an embodiment of a connectionless communication system according to the present invention.

FIG. 2 is a system configuration diagram of a connectionless communication service in a conventional communication network.

FIG. 3 is a detailed diagram showing an embodiment of the LAN-to-LAN connection according to the present invention.

FIG. 4 is a detailed diagram showing an embodiment of communication between an ATM terminal and a terminal connected to a LAN according to the present invention.

FIG. 5 is an explanatory diagram of a protocol conversion method in a connectionless communication service in a conventional communication network.

FIG. 6 is a cell format in connectionless communication.

[Explanation of symbols]

10, 11 Terminal 12 connected to LAN
Connectionless ATM terminal 20, 21 LAN 30,
31 LAN accommodation module 32 AT
M terminal accommodation modules 40, 41
Call processing maintenance operation modules 50, 51
ATM switch 60, 61
Connectionless service modules 70, 71 Ring interface modules 301, 311, 321 Layer 1 termination circuit 302,
312 MAC bridge circuit 303
, 313 Cell disassembly and assembly circuit 304
, 314, 324, 601, 611 ATM interface circuit

Claims (6)

[Claims] Claim 1: In a switching node that accommodates any or more of terminals, lines, and networks and performs communication between switching nodes via a ring, a switch means for switching input cells, and a switch connected to the switch means. and a connectionless service means for providing a connectionless communication service, and a ring interface means connected to the switch means and the ring to provide an interface with the ring, when accommodating a terminal. In the case of accommodating a line, a line accommodating means is provided, and in the case of accommodating a LAN network, a network accommodating means is provided as necessary. 1. A switching node characterized in that a connectionless connection service is provided between terminals, lines, and networks by means of means and network accommodating means. 2. A connectionless communication method for a communication network connected to a switching node according to claim 1, which accommodates one or more of a terminal, a line, and a network and performs communication via a ring. ,
Among the terminals, for a terminal that requests a connectionless communication service, the terminal is terminated in advance by the terminal accommodating means, and the terminal is connected between the terminal accommodating means and the connectionless service means via the switch means according to the terminal. A connectionless communication method characterized by a fixed connection and a connectionless connection service provided by a connectionless service means. 3. The connectionless communication method for a communication network connected to a switching node according to claim 1, which accommodates one or more of a terminal, a line, and a network and performs communication via a ring. ,
Among the lines, for a line that requests a connectionless communication service, the line is terminated in advance at a line accommodation means, and a half line is connected between the line accommodation means and the connectionless service means via the switch means. A connectionless communication method characterized in that the connection is fixed and the connectionless service means performs a connectionless connection service. 4. A connectionless communication method for a communication network connected to a switching node according to claim 1, which accommodates one or more of a terminal, a line, and a network and performs communication via a ring. ,
terminating a network signal with a network accommodating means for accommodating a LAN network, converting the network signal into a predetermined signal, and semi-permanently connecting the network accommodating means and the connectionless service means via the switch means; A connectionless communication method characterized in that the connectionless service means performs a connectionless connection service. 5. The connectionless communication method for a communication network connected to a switching node according to claim 1, which accommodates one or more of a terminal, a line, and a network and performs communication via a ring. ,
The plurality of distributed switching nodes are connected by a ring, and the switching nodes perform connectionless communication on the ring by making a path connection between the connectionless service means of each switching node via the ring, A connectionless communication method characterized in that a connectionless connection service is performed within the switching node. 6. The connectionless communication method for a communication network connected to a switching node according to claim 1, which accommodates one or more of a terminal, a line, and a network and performs communication via a ring. ,
The plurality of distributed exchange nodes are connected by a ring, the connectionless service means is installed in a predetermined exchange node, and the connectionless service means and each exchange node have terminal accommodation means, line accommodation means, and network accommodation means. A connectionless communication method characterized by providing a connectionless connection service by making a semi-permanent connection.