JP3430145B2 - Cell / frame switching processing apparatus, cell / frame switching processing system and processing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cell / frame switching processing device, a cell / frame switching processing system, and a processing method therefor for exchanging cell data and frame data in a packet communication network in an asynchronous transfer mode. The present invention relates to a cell / frame switching processing device, a cell / frame switching processing system, and a processing method thereof that perform switching processing between fixed-length packets (ATM cells) and variable-length packets (HDLC frames).

[0002]

2. Description of the Related Art FIG. 4 shows the configuration of a communication system including a conventional packet switching processing device. As shown in FIG. 4, conventionally, a host computer 200 and a plurality of terminal devices 300 to 500 are configured to be connected to a packet switching processing device 101 via a high speed digital transmission service.

Here, when any one of the existing terminal devices 300 to 500 is transferred to an ATM terminal, the station data is artificially changed sequentially as described above.

In addition, when the existing network is switched to a network having an ATM backbone, the facilities of the existing network cannot be effectively used.

[0005]

As described above, when migrating an existing terminal to an ATM terminal, it is necessary to sequentially change station data, which requires a huge amount of time for migration work, and station data error and the like. There was a problem that human error occurred.

[0006] In existing networks, AT
When switching to a network having M (asynchronous transfer mode) as a backbone, there has been a problem that a huge capital investment is newly required to effectively use the equipment of the existing network.

The present invention has been made in view of the above problems, and a cell / frame switching processing device, a cell / frame switching processing system and a cell / frame switching processing system capable of easily switching an existing network to a network having an ATM backbone. It is intended to provide a processing method thereof.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 is a cell-frame switching processing device for performing exchange processing in an asynchronous transfer mode via a network, which is connected via the network. Receiving means for receiving data, a monitoring means for monitoring whether the data received by the receiving means is cell data or frame data, and a conversion means for converting the data to cell data by the monitoring means when the data is cell data, When the data is frame data by the monitoring means, there is a detouring means for bypassing the conversion processing so that the conversion processing to the frame data is not performed.

According to a second aspect of the invention, in the first aspect of the invention, the monitoring means monitors the data received by the receiving means in time slot units.

According to a third aspect of the present invention, in the second aspect of the invention, the monitoring means monitors the data based on cell synchronization in time slot units, and determines that cell synchronization is established as cell data. It is characterized in that the frame data is determined when cell synchronization is not established.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the network is
It is a high-speed digital communication line.

A fifth aspect of the present invention is a cell frame switching processing system in which a plurality of terminal devices and a cell frame switching processing device are connected via a network, wherein the cell frame switching processing device comprises: Of the plurality of terminal devices, receiving means for receiving data transmitted from any terminal device via the network, monitoring means for monitoring whether the data received by the receiving means is cell data or frame data, and the monitoring means When the data is cell data, the conversion means for converting to frame data, and when the data is frame data by the monitoring means,
The present invention is characterized in that it has detouring means for detouring so as not to perform conversion processing to frame data by the converting means, and transmitting means for transmitting the data sent from the converting means or the detouring means to the network.

According to a sixth aspect of the invention, in the fifth aspect of the invention, the monitoring means monitors the data received by the receiving means in time slot units.

According to a seventh aspect of the present invention, in the sixth aspect of the invention, the monitoring means monitors the data based on cell synchronization in time slot units, and determines that cell synchronization is established as cell data. It is characterized in that the frame data is determined when cell synchronization is not established.

According to the invention described in claim 8, in the invention described in any one of claims 5 to 7, the network is
It is a high-speed digital communication line.

According to a ninth aspect of the present invention, there is provided a processing method for a cell / frame switching processing system, which comprises a plurality of terminal devices and a cell / frame switching processing device connected via a network. The device receives a data from an arbitrary terminal device of a plurality of terminals via a network, a monitoring step of monitoring whether the data received in the receiving step is cell data or frame data, and the monitoring step causes the data to In the case of data, a conversion step of converting to frame data, and a detouring step of detouring so as not to perform conversion processing to frame data in the conversion step when the data is frame data by the monitoring step, and a conversion step or a detouring step. Data sent by And having a transmission step of signal to, the.

According to a tenth aspect of the present invention, in the ninth aspect of the invention, the monitoring step monitors the data received by the receiving step in time slot units.

According to an eleventh aspect of the present invention, in the tenth aspect of the invention, the monitoring step monitors data based on cell synchronization in time slot units, and determines that cell synchronization is established as cell data. It is characterized in that the frame data is determined when cell synchronization is not established.

The invention according to claim 12 is from claim 9 to claim 1.
In the invention described in any one of 1, the network is a high-speed digital communication line.

<Operation> The present invention is a cell / frame switching processing device for performing exchange processing in a mode (ATM = Asynchronous Transfer Mode / Asynchronous Transfer Mode) in which a fixed length packet (53 bytes) called a cell is asynchronously transmitted by a user. In the above, the data received from the high-speed digital leased line or the ISDN network is constantly monitored for each time slot unit whether it is ATM cell data or HDLC frame data. Based on this monitoring result, if the received data is cell data, The cell data exchange-processed by the ATM exchange processing unit is converted into HDLC frame data and transmitted to the packet exchange processing unit. When the received data is HDLC frame data, the ATM exchange processing unit is bypassed and the data is passed through the selector. To directly connect to the packet switching processing unit.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a cell / frame switching processing apparatus, a cell / frame switching processing system and a processing method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3, there are shown an embodiment of a cell / frame switching processing device, a cell / frame switching processing system and a method thereof according to the present invention.

FIG. 1 is a block diagram showing a schematic configuration of a cell / frame switching processing system according to an embodiment of the present invention. In FIG. 1, a cell frame switching processing system according to an embodiment of the present invention includes a cell frame switching processing device 10 through a high-speed digital transmission service.
0 and the host computer 200 are connected,
ATM in the cell / frame switching processor 100
It comprises an exchange processing unit 111 and a packet exchange processing unit 112, and is configured by connecting a plurality of terminal devices 300, 400 and an ATM terminal 500 via a high-speed digital transmission service. The ATM terminal 500 here indicates that the existing terminal device 500 shown in FIG. 4 has been transferred to the ATM terminal.

When the data received by the cell synchronization detection unit 110 is an ATM cell, the ATM exchange processing unit 111
Conversion processing to frame data is performed, and in the case of HDLC frame data, it is bypassed.

The packet exchange processing unit 112 packetizes the data transmitted from the cell frame switching processing device 100 to the high speed digital transmission service.

Although a plurality of high-speed digital transmission services according to the embodiment of the present invention are shown in the drawings,
They all show the same network, and are shown separately for convenience of explanation.

<First Embodiment> FIG. 2 shows a first embodiment of the present invention.
FIG. 3 is a block diagram showing a schematic configuration of a cell / frame switching processing device that is an embodiment of the present invention. In FIG. 2, the frame switching processing device 100 according to the embodiment of the present invention is
A cell synchronization detector 110, an ATM exchange processor 111,
The packet switching processing unit 112, the selector 113, the cell separation and assembly unit 114, the communication processing unit 115, the communication processing unit 116, and the main control unit 117 are configured.

The cell synchronization detection unit 110 establishes cell synchronization for each time slot of the data received through the high-speed digital transmission service and communication processing unit 115 to establish AT.
It constantly monitors whether it is M cell data or HDLC frame data, and notifies the main controller 117 of it.

The ATM exchange processing unit 111 is bypassed by the cell synchronization detecting unit 110 when the data received through the high-speed digital transmission service is frame data.

The packet exchange processing unit 112 converts the data transmitted via the communication processing unit 116 into a packet format and outputs it to the high speed digital transmission service.

The selector 113 is a cell synchronization detector 110.
In the above, the data received by the communication processing unit 115 is constantly monitored for establishment of cell synchronization on a time slot basis, and based on the monitoring result, in the case of frame data, the ATM exchange processing unit 111 is bypassed. In the case of, it is switched to pass through the ATM exchange processing unit 111.

The cell separating / assembling unit 114 includes a selector 113.
If the received data is ATM cell data depending on the state, the ATM cell data is converted to HDLC frame data and the HDLC frame data is converted to ATM cell data, and the converted data is sent to the communication processing unit 116. To send.

The communication processing unit 115 is provided between the high speed digital transmission service and the cell synchronization detecting unit 110 and receives data transmitted via the high speed digital transmission service.

The communication processing unit 116 is operated by the selector 113 via the ATM exchange processing unit 111, or
The data directly transmitted from the communication processing unit 115 without passing through the exchange processing unit 111 is transmitted to the packet exchange processing unit 112.

The main control unit 117 is a CPU that controls the operation of each of the above-described units based on a separately stored processing program, and switches the selector 113 based on the monitoring result from the cell synchronization detection unit 110. Take control.

Next, an operation example of the cell frame switching processing apparatus according to the first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the cell frame processing apparatus 10 according to the first embodiment of the present invention.
0 is a host computer 200 and terminal devices 300 to 5
It is located between 00 and is connected to a high-speed digital transmission service.

In order to shift to a network having ATM as a backbone, a connection with a high-speed digital leased line is drawn into the cell / frame switching processing unit 100, connected with the communication processing unit 115, and the communication processing unit 116 uses the cell / frame switching processing unit. Connect with 100.

The data received from the plurality of terminal devices 300 to 500 uses the high-speed digital transmission service and connects the line multiplexed with the digital dedicated line to the communication control unit 116. The cell synchronization detection unit 110 constantly monitors the data received from the communication processing unit 115 in units of time slots to establish cell synchronization.

For example, when the data received from the terminal device 400 is HDLC frame data, the cell synchronization detector 1
In 10, the cell synchronization is not established in all time slots, so the main control unit 117 sets the selector 113 to A
Bypassing the TM exchange processing unit 111, the communication processing unit 11
The selector 113 is switched so that the data input to 5 is directly output to the communication processing unit 116.

In this way, the terminal device 400 is connected to the ATM.
Before changing to a terminal, data is transmitted to the packet exchange processing unit 112 without passing through the ATM exchange processing unit 111.

Next, when the terminal device 500 is changed to an ATM terminal, the cell synchronization of the corresponding time slot is established in the cell synchronization detecting section 110, so that the main control section 117 performs the ATM exchange processing for the corresponding time slot. Part 111
The selector 113 is switched so as to be connected to the packet switching processing unit 112 via. The data exchanged by the ATM exchange processing unit 111 is transferred to the ATM by the cell separation / assembly unit 114.
The cell data is converted into an HDLC frame and connected to the packet exchange processing unit 112 via the selector 113. In this way, any terminal device 500 can be changed to an ATM terminal without changing the station data.

<Second Embodiment> FIG. 3 shows a second embodiment of the present invention.
FIG. 3 is a block diagram showing a schematic configuration of a cell / frame switching processing device that is an embodiment of the present invention. Referring to FIG. 3, a cell / frame switching processing device 100 according to a second embodiment of the present invention includes a cell synchronization detection unit 110a, 110b and an AT.
M exchange processing units 111a and 111b, selector 113a,
113b, cell separating / assembling units 114a and 114b, and communication processing units 115a and 115b are provided two by two.

The basic processing operation is the same as that of the above-described first embodiment of the present invention, but the processing is distributed when the amount of data to be received is large or the priority information of each data is referred to. Therefore, the switching process can be speeded up and the load can be reduced.

The above-described embodiment is a preferred embodiment of the present invention, and various modifications can be made without departing from the scope of the present invention. For example, even when the service being used is a frame relay service or an ISDN service, automatic switching between cells and frames is possible with the same configuration as the present invention.

Also, by connecting the communication processing unit 115 and the cell synchronization detecting unit 110 to the line that interfaces with the host computer 200, the host computer 200 is changed or added to the ATM interface by automatic switching between cells and frames. Even in cases, it is possible to make a flexible transition.

[0045]

As is apparent from the above description, according to the cell / frame switching processing device, the cell / frame switching processing system and the processing method thereof of the present invention, there is no need to change the station data by human work. Since no human error such as station data error occurs, it is possible to easily switch from the existing network to the network having the ATM as the backbone.

Further, according to the cell / frame switching processing device, the cell / frame switching processing system and the processing method thereof of the present invention, it is possible to use the network having the ATM as the backbone together with the existing network equipment inherited. This is easily possible, and the equipment of the existing network can be used to the maximum, so that the equipment investment can be minimized.

Further, according to the cell / frame switching processing device, the cell / frame switching processing system and the processing method thereof of the present invention, whether the type of terminal to be connected is an ATM terminal or another data terminal. Since the cell / frame switching processing device side can automatically switch between cell data and non-cell data and receive the data, when changing another data terminal provided with a service in the existing network to an ATM terminal, It is possible to freely relocate without changing the station data, and it is possible to easily migrate to a network having an ATM as a backbone.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a cell / frame switching processing system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a cell frame switching processing device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a cell frame switching processing device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a schematic configuration of a communication system including a conventional packet exchange processing unit.

[Explanation of symbols]

100 cell / frame switching processor 111 ATM exchange processing unit 112 Packet switching processing unit 113 selector 114 Cell Separation Assembly Department 115 Communication processing unit 116 Communication processing unit 117 Main control unit 200 host computer 300, 400, 500 terminal device

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-23252 (JP, A) JP-A-3-158039 (JP, A) JP-A-4-291853 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04L 29/06 H04L 12/28

Claims (12)

(57) [Claims] 1. A cell / frame switching processing device for performing exchange processing in an asynchronous transfer mode via a network, comprising: receiving means for receiving data via the network; and the data received by the receiving means. Monitoring means for monitoring cell data or frame data, and when the data is cell data by the monitoring means,
A conversion unit that converts the frame data into frame data; and a detour unit that detours the data so that the conversion unit does not convert the frame data when the data is frame data. Cell / frame switching processor. 2. The cell / frame switching processing device according to claim 1, wherein the monitoring unit monitors the data received by the receiving unit in units of time slots. 3. The monitoring means monitors the data based on cell synchronization in time slot units, determines that cell synchronization is established as cell data, and determines that cell synchronization is not established as frame data. 3. The cell / frame switching processing device according to claim 2, wherein: 4. The network is a high speed digital communication line.
4. The cell frame switching processing device according to any one of 1 to 3. 5. A cell frame switching processing system in which a plurality of terminal devices and a cell frame switching processing device are connected via a network, wherein the cell frame switching processing device is the plurality of terminal devices. Of these, receiving means for receiving data transmitted from any terminal device via the network, monitoring means for monitoring whether the data received by the receiving means is cell data or frame data, and the monitoring means If the data is cell data,
Conversion means for converting to frame data; detour means for detouring so that the conversion means does not perform conversion processing to frame data when the data is frame data by the monitoring means; the conversion means or the detour means And a transmission unit for transmitting the data transmitted from the network to the network. 6. The cell / frame switching processing system according to claim 5, wherein the monitoring unit monitors the data received by the receiving unit in units of time slots. 7. The monitoring means monitors the data based on cell synchronization on a time slot basis, determines that cell synchronization is established as cell data, and determines that cell synchronization is not established as frame data. 7. The cell / frame switching processing system according to claim 6. 8. The network according to claim 5, wherein the network is a high-speed digital communication line.
7. The cell / frame switching processing system according to any one of 1 to 7. 9. A processing method of a cell frame switching processing system, comprising a plurality of terminal devices and a cell frame switching processing device connected via a network, wherein the cell frame switching processing device comprises: A receiving step of receiving data from an arbitrary terminal device of the terminal via the network; a monitoring step of monitoring whether the data received in the receiving step is cell data or frame data; In the case of data, a conversion step of converting into frame data; a detouring step of detouring so as not to perform conversion processing into frame data in the conversion step when the data is frame data by the monitoring step; Step or said detour step And a transmitting step of transmitting the stored data to the network, the processing method of the cell frame switching processing system. 10. The processing method of a cell / frame switching processing system according to claim 9, wherein the monitoring step monitors the data received by the receiving step in units of time slots. 11. The monitoring step monitors the data based on cell synchronization in time slot units, determines that cell synchronization is established as frame data, and determines that cell synchronization is not established as cell data. The processing method of the cell frame switching processing system according to claim 10. 12. The network is a high speed digital communication line.
12. The processing method of the cell frame switching processing system according to any one of 1 to 11.