KR101045947B1 - Low-cost multiplexing communication system and communication device having switching function included in the same - Google Patents

Abstract

PURPOSE: A multiplex communication system including a plurality of master devices and a plurality of subnets is provided to smoothly perform communication with a communication device in error of a specific subnet. CONSTITUTION: In case an IP of an Ethernet frame is different from a registered IP, a first communication device transfers the Ethernet frame to a second communication device(212b). The switch is connected through a first subnet(204) and a second subnet(206). A communication device IP is allocated for a first master device(200).

Description

LOW-COST MULTIPLEXING COMMUNICATION SYSTEM AND COMMUNICATION DEVICE HAVING SWITCHING FUNCTION INCLUDED IN THE SAME

The present invention relates to a multiplexed communication system.

A communication system is a system capable of transmitting and receiving data packets, and generally has a structure as shown in FIG. 1 below.

1 is a diagram illustrating a general communication system.

Referring to FIG. 1, a communication system includes a master element 100, a plurality of communication elements 102, and switches 104.

The master device 100 controls the operation of the communication devices 102.

The communication elements 102 are each connected to the corresponding switch 104, in particular to the switch 104 via one line. Thus, when the subnet fails or the link between the subnet and the communication element 102 is broken, the communication elements 102 could not perform an appropriate communication operation.

In addition, since the communication system requires a large number of switches 104 in proportion to the number of communication elements 102, the construction cost of the communication system is inevitably increased.

An object of the present invention is to provide a multiplexed communication system that can continuously perform communication even in the case of failure of a specific subnet and can be implemented at low cost.

In order to achieve the above object, an Ethernet multiplexing communication system according to an embodiment of the present invention comprises a first subnet; Second subnet; A switch connected to all of the subnets; A first communication element connected with the switch; A second communication element connected with the first communication element; A first master element connected to the first subnet; And a second master element connected to the second subnet. Herein, at least one of the first communication element and the second communication element has two or more IPs, and the first communication element is an IP in which an IP of an Ethernet frame transmitted through the switch is registered in the first communication element. If different from the transmitted Ethernet frame to the second communication element, the switch is connected to the first subnet and the second subnet through a different line, the IP of the communication element having the plurality of IP One of is allocated for the first master element and the other IP is allocated for the second master element.

According to another embodiment of the present invention, a multiplexed communication system includes a first subnet; Second subnet; A first communication element coupled with at least one of the subnets; A second communication element connected with the first communication element; A first master element connected to the first subnet; And a second master element connected to the second subnet. Here, the first communication element has at least two IPs, and when the IP of the data packet transmitted from one of the subnets is different from the IP registered in the first communication element, the transmitted data packet is transmitted to the second communication. And one of the IPs of the communication device having the plurality of IPs is allocated for the first master device and the other IP is allocated for the second master device.

At least one of the subnets in a multiplexing communication system having a first master device, a second master device, a first subnet connected to the first master device, and a second subnet connected to the second master device according to an embodiment of the present invention. The communication device connected to the one may include: an analyzer configured to analyze a data packet transmitted from one of the subnets and determine whether a destination IP of the data packet is the same as an IP registered in the communication device; And a data transfer unit for transferring the data packet to another communication element when the destination IP of the data packet is different from the registered IP. Here, the first subnet is connected to the first master device, the second subnet is connected to the second master device, a plurality of IPs are registered in the communication device, one of the IP is the first master device Is assigned for the other one of the IPs for the second master element.

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Since the multiplexing communication system of the present invention includes a plurality of master elements and a plurality of subnets, communication can be performed smoothly even if a specific subnet fails.

In addition, since the communication elements are sequentially connected to each other in a single line or a dual line, the number of switches and the number of cables required to implement the communication system may be reduced, thereby reducing the cost of implementing the communication system. Here, the communication devices register a plurality of IPs, and compare the registered IP with the destination IP of the received data packet, and if the IPs are different, transmit the data packet to the next communication device by transmitting the data packet to the next communication device. To pass.

1 is a diagram illustrating a general communication system.
2 is a diagram illustrating a multiplexing communication system according to a first embodiment of the present invention.
3 is a flowchart illustrating the operation of a multiplexed communication system according to an embodiment of the present invention.
4 is a flowchart illustrating a failure control process of a multiplexed communication system according to an exemplary embodiment of the present invention.
5 is a diagram illustrating a multiplexed communication system according to a second embodiment of the present invention.
6 is a diagram illustrating a multiplexing communication system according to a third embodiment of the present invention.
7 is a block diagram illustrating a communication device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating a multiplexing communication system according to a first embodiment of the present invention.

Referring to FIG. 2, the multiplexing communication system of this embodiment includes a first master element 200, a second master element 202, a first subnet 204, a second subnet 206, a switch 210, and a plurality of switches. Communication elements 212.

Master elements 200 and 202 manage the overall operation of the communication system and in particular control the operation of communication elements 212. According to one embodiment of the invention, the second master element 202 does not perform a control operation while the first master element 200 controls the communication elements 212, the second master element 202 The first master element 200 does not perform a control operation while controlling the communication elements 212. That is, the master devices 200 and 202 do not perform the control operation at the same time, but only one performs the control operation.

According to another embodiment of the present invention, not only one of the subnets 204 and 206 may operate, but the subnets 204 and 206 may operate simultaneously. In this case, the master elements 200 and 202 manage the corresponding communication elements 212.

The switch 210 is connected to all subnets 204 and 206 and delivers data packets transmitted through the subnets 204 and 206 to the communication elements 212. According to one embodiment of the present invention, the switch 210 is connected to the first subnet 204 through one line (eg, a communication cable) as shown in FIG. 2, and the second subnet 206. And are connected through one line. This is to facilitate communication through other subnets 204 or 206 even if a particular subnet 204 or 206 fails.

The first communication element 212a is connected to the switch 210 through one line and the second communication element 212b of the next stage through one line. That is, the communication elements 212a to 212n are connected to each other through one line.

According to an embodiment of the present invention, each of the communication elements 212a to 212n registers a plurality of IPs (Internet Protocols), and for example, registers two IPs (DUAL IPs). Specifically, one IP is allocated for the first master element 200 and the other IP is allocated for the second master element 202. That is, data packets transmitted through the first subnet 204 under the control of the first master element 200 are received through one IP, and the second subnet 206 under the control of the second master element 202. Data packet transmitted through) is received through other IP.

According to an embodiment of the present invention, the communication elements 212a to 212n respectively include a control unit 220 and a switching unit 222. Here, the switching unit 222 transmits the data packet to the next communication element 212 under the control of the control unit 220 if it is not a data packet to be processed.

Although referred to above as two subnets 204 and 206, a multiplexed communication system may include three or more subnets. In this case, there may be master devices according to the number of subnets, and two master devices may control the subnets.

In short, the multiplexing communication system of the present embodiment uses a plurality of master elements and a plurality of subnets to communicate data packets through different subnets when one subnet fails. Therefore, unlike the conventional communication system in which the entire system is paralyzed when a failure occurs in the subnet, in the multiplexed communication system of the present embodiment, even if a failure occurs in a specific subnet, communication is possible through another subnet. have.

In addition, in the multiplexing communication system of the present embodiment, communication elements 212 are connected to each other, and each communication element 212 includes a switching unit 222 to transmit a data packet to a next communication element. That is, unlike in a conventional communication system in which communication elements are each connected to a subnet, in this embodiment, only one of the communication elements 212 is connected to the subnet through the switch 210 and the remaining communication elements 212 are connected to the subnet. It is connected to the communication element 212 at the front end. Therefore, less switch 210 is required as compared to the conventional communication system, and thus the cost of the switch 210 itself and the cost of laying the cable for installing the switch 210 can be reduced.

In summary, the multiplexed communication system of the present embodiment can be implemented at low cost and can smoothly perform a communication operation even when a specific subnet fails. In particular, the multiplexed communication system of the present embodiment can be usefully utilized for low cost systems that only monitor the operation of the communication elements 212.

According to an embodiment of the present invention, the multiplexed communication system of the present invention may be an Ethernet system, and the data packet may be an Ethernet frame.

According to another embodiment of the present invention, in FIG. 2, the first communication element 212a may be directly connected to the subnets 204 and 206 without being connected to the switch 210. That is, the first port of the first communication device 212a may be connected to the first subnet 204 through the first line, and the second port may be connected to the second subnet 206 through the second line. However, when the communication system is an Ethernet system, the communication elements 212 are connected to the subnet 204 or 206 through the switch 210.

Hereinafter, the operation of the multiplexed communication system of the present invention will be described.

3 is a flowchart illustrating the operation of a multiplexed communication system according to an embodiment of the present invention. However, for convenience of explanation, the multiplexed communication system is assumed to be the redundant communication system shown in FIG. 2.

The first communication element 212a receives a data packet transmitted through the switch 210 (S300). Of course, the other communication element 212 receives the data packet transmitted from the communication element 212 of the front end.

Subsequently, the communication device 212 analyzes the received data packet to detect the destination IP (S302).

Subsequently, the communication device 212 determines whether the detected IP matches one of the IPs registered by the communication device 212 (S304).

If the detected IP is different from the registered IP, the communication device 212 controls the switching unit 222 to transfer the received data packet to the next communication device 212 (S306).

On the other hand, if the detected IP matches the registered IP, the communication element 212 determines that the transmitted data packet is its destination and processes the data packet internally (S308). Here, there is no particular limitation on the manner of processing the data packet.

In summary, the communication device 212 determines whether the data packet transmitted from the outside is the destination through multiple IPs, and compares the data packet with the next communication device if it is not the destination. To send. As a result, the data packet can be transmitted to the destination communication element 212 in this manner.

4 is a flowchart illustrating a failure control process of a multiplexed communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the first master device 200 controls the operation of the entire communication system, and thus a data packet is transmitted through the first subnet 204 (S400).

Subsequently, the first master device 200 determines whether a failure occurs in the first subnet 204 (S402).

If no failure occurs in the first subnet 204, the first master element 200 continues to control the communication system.

On the other hand, when a failure occurs in the first subnet 204, the first master device 200 detects the occurrence of a failure and notifies the fact that the failure has occurred to the second master device 202 (S404).

Subsequently, the second master element 202 starts controlling the communication system (S406). Of course, the first master device 200 no longer performs a system control operation.

In summary, in the multiplexing communication system of the present invention, when a failure occurs in a specific subnet, communication is performed through another subnet. Therefore, the master elements 200 and 202 must communicate with each other, and when a failure occurs in a specific subnet, the system transfers control authority to another master element.

According to another embodiment of the present invention, when a failure occurs in the first subnet 204, the first master device 200 may directly transfer the transfer of control authority without notifying the second master device 202 of the failure. It may be.

5 is a diagram illustrating a multiplexed communication system according to a second embodiment of the present invention.

Referring to FIG. 5, the multiplexing communication system of the present embodiment includes a first master element 500, a second master element 502, a first subnet 504, a second subnet 506, communication elements 510, and the like. Switches 512.

Unlike in the first embodiment, in this embodiment the communication elements 510 are connected directly to the subnets 504 and 506 via double lines or to the corresponding switch 512 via double lines. That is, the communication elements 510 are not physically connected directly to each other.

Referring to the data packet transmission process, the data packet is transmitted to the communication device 510 through the subnet 504 or 506, but the communication device 510 does not directly transmit the data packet to another communication device 510. Therefore, the communication element 510 of this embodiment does not need to include a switching part. However, in the communication system of the present embodiment, since a plurality of switches 512 are required for the remote communication device 510, the switch cost is increased. In addition, since the communication elements 510 are connected to the subnets 504 and 506 or the switches 512 through dual lines, the cable installation cost is increased compared to the first embodiment.

That is, compared with the communication system of the first embodiment, the communication system of the second embodiment is increased in cost but can operate more stably. Therefore, when stable operation of the communication system is more important, the communication system of the second embodiment is preferable, and the communication system of the first embodiment is preferable in a low-cost communication system which performs only simple monitoring.

Although not mentioned above, the communication elements 510 register a plurality of IPs, respectively.

6 is a diagram illustrating a multiplexing communication system according to a third embodiment of the present invention.

Referring to FIG. 6, the multiplexed communication system of this embodiment includes a first master element 600, a second master element 602, subnets 604 and 606, a switch 610, and a plurality of communication elements 612. It includes.

Since the remaining components except for the connection of the communication elements 612 are the same as in the first embodiment, the description of the same components will be omitted.

Unlike in the first embodiment in which the communication elements 212 are connected to each other in a single line, the communication elements 612 of the present embodiment are connected through mutual double lines. Therefore, the multiplexed communication system of the present embodiment can operate more stably in cost but increase in cost than the communication system of the first embodiment. Of course, the multiplexing system of this embodiment is less expensive than the communication system of the second embodiment.

Although not described above, the communication elements 612 register multiple IPs, respectively, and may be connected to each other by more than three lines.

7 is a block diagram illustrating a communication device according to an embodiment of the present invention. However, since the present invention may be implemented in various embodiments, additional reference numerals are added to the components.

Referring to FIG. 7, the communication device of the present embodiment includes a control unit 700, a transceiver 702, an IP manager 704, an analyzer 706, a data processor 708, a data transmitter 710, and a switching unit. 712 and storage 714.

The transceiver 702 is a path for transmitting and receiving data packets, and may be implemented by wireless or wired.

The IP manager 704 manages a plurality of IPs assigned to the communication device, and may register and change the assigned IPs, for example.

The analyzer 706 analyzes the data packet transmitted through the transceiver 702 to determine whether the destination IP of the data packet is the same as its own IP.

The data processor 708 processes the data packet when the destination IP of the data packet is the same as its IP.

If the destination IP of the data packet is not the same as its IP, the data transfer unit 710 controls the switching unit 712 to transfer the data packet to another communication element.

The storage unit 714 stores various data and programs.

The control unit 700 controls the overall operation of the components of the communication device.

The embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. Should be considered to be within the scope of the following claims.

100 master device 102 communication device
104: switch 200: first master element
202: second master element 204: first subnet
206: second subnet 210: switch
212 communication element 220 control unit
222: switching unit 500: first master element
502: second master element 504: first subnet
506: second subnet 510: communication device
512 switch 600 first master element
602: second master element 604: first master element
606: second master element 610: switch
612 communication device 700 control unit
702: transceiver unit 704: IP management unit
706 analysis unit 708 data processing unit
710: data transfer unit 712: switching unit
714: storage unit

Claims (15)

A first subnet;
Second subnet;
A switch connected to all of the subnets;
A first communication element connected with the switch;
A second communication element connected with the first communication element;
A first master element connected to the first subnet; And
A second master element connected to the second subnet,
At least one of the first communication element and the second communication element has two or more IPs, and the first communication element has an IP of an Ethernet frame transmitted through the switch different from the IP registered in the first communication element. The Ethernet frame is transmitted to the second communication element, and the switch is connected through a line different from the first subnet and the second subnet, and one of IPs of the communication element having the plurality of IPs. Is allocated for the first master element and another IP is allocated for the second master element. The Ethernet multiplexed communication system of claim 1, wherein the first communication element and the second communication element are connected through two or more lines. A first subnet;
Second subnet;
A first communication element coupled with at least one of the subnets;
A second communication element connected with the first communication element;
A first master element connected to the first subnet; And
A second master element connected to the second subnet,
The first communication element has at least two IPs, and when the IP of the data packet transmitted from one of the subnets is different from the IP registered in the first communication element, the transmitted data packet is transferred to the second communication element. And wherein one of the IPs of the communication element having the plurality of IPs is allocated for the first master element and the other IP is allocated for the second master element. The system of claim 3, wherein the multiplexing communication system comprises:
Further comprising a switch connected through a different line with the first subnet and the second subnet,
And the switch and the first communication element are connected by one line, and the first communication element and the second communication element are also connected by one line. The method of claim 4, wherein the first communication element,
Control unit; And
Including a switching unit controlled by the control unit,
The switching unit transfers the data packet to the second communication element under the control of the controller when the IP of the data packet transmitted through the switch is different from the IP registered in the first communication element. system. The method of claim 3, wherein the first communication element is connected via the two lines to the first subnet and the second subnet, characterized in that the first communication element and the second communication element is connected in a single line. Multiplexed communication system. 4. The multiplexed communication system of claim 3, wherein the first communication element and the second communication element are connected via two lines. The operation of claim 3, wherein the second master device communicates with the first master device when the first subnet detects that a failure occurs in the first subnet, and then operates the communication elements through the second subnet. Multiplexed communication system, characterized in that for controlling. A communication device connected to at least one of the subnets in a multiplexed communication system having a first subnet and a second subnet,
An analysis unit for analyzing a data packet transmitted from one of the subnets and determining whether a destination IP of the data packet is the same as an IP registered in the communication element; And
If the destination IP of the data packet is different from the registered IP includes a data transfer unit for transmitting the data packet to another communication element,
The first subnet is connected with a first master element, the second subnet is connected with a second master element, and a plurality of IPs are registered in the communication element, and one of the IPs is for the first master element. The other one of the IPs is assigned for the second master element. The method of claim 9, wherein the communication element,
A data processor for processing the data packet when the destination IP of the data packet is the same as the registered IP;
Switching unit; And
Further comprising an IP management unit for managing the IP of the communication element,
And the data transfer unit controls the operation of the switching unit to transfer the data packet to the other communication element, and the IP management unit manages at least two IPs. 10. The method of claim 9, wherein the subnets are connected through a switch and two lines, the communication device is connected through a single line with the switch, and the communication device and the other communication device are connected through a single line. Communication element used in a multiplexed communication system. delete delete delete delete

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