KR100891625B1 - A method for transmitting an optical ethernet signal and an optical ethernet signal transmitting system using the method - Google Patents

Abstract

An optical Ethernet signal transmission method and a system using the same are provided to transmit reliable data at the speed of the maximum 4ms by switching a network through the hardware processing by the self protocol. An optical Ethernet signal transmission system comprises a plurality of remote devices(121,122,123,124,125,126), a central device(110), the first optical core network and the second optical core network. The central device comprises an optical signal converting unit and controller. The optical signal converting unit mutually converts the Ethernet signal and optical Ethernet signal. The controller controls the optical Ethernet signals provided to the remote devices. In case a network has a defect, the controller performs the switching of remote devices by a received NMS(Network Management System) frame.

Description

Optical Ethernet signal transmission method and optical Ethernet signal transmission system using the same {A METHOD FOR TRANSMITTING AN OPTICAL ETHERNET SIGNAL AND AN OPTICAL ETHERNET SIGNAL TRANSMITTING SYSTEM USING THE METHOD}

The present invention relates to an optical Ethernet signal transmission system. More specifically, it relates to an optical Ethernet signal transmission system that increases the efficiency of an optical core.

In recent years, as the service demand of users increases, the slave channel transmission speed of a node in the optical communication network increases significantly in order to transmit a large amount of optical signal data. However, loss of optical signal data is caused when the optical path between any nodes is cut off. In order to solve this problem, research on ultra-high speed / high capacity optical nodes has been actively conducted. Among them, many techniques have been proposed for bypassing signals when cutting optical lines in optical wavelength branching / combining structures.

In the conventional method of switching the optical path, by transmitting network control data between each packet, the amount of packets that transmit the actual data is drastically reduced, thereby reducing the efficiency of data communication. It has the disadvantage of being. In addition, there are many difficulties in constructing an optical communication network due to the high cost or difficulty in network expansion.

Accordingly, the present invention is to solve the above-described problem, the optical Ethernet transfer and data signal transmission to significantly reduce the packet usage used for fast recovery speed and control by performing the transfer by hardware means when switching in the optical communication network Its purpose is to provide a method.

The optical Ethernet signal transmission method according to an embodiment of the present invention is provided to a plurality of remote devices including a device for transmitting and receiving Ethernet, optical signal changing means for converting between the Ethernet signal and the optical Ethernet signal and the plurality of remote devices A central device including a control means for controlling the optical Ethernet signal, starting from the central device and interworking with the central device again through the plurality of remote devices to have an annular structure and transmit optical data in a first direction A first optical core network and a plurality of remote devices starting from the central device and interworking with the central device again to have a ring structure, and transmitting data in a second direction opposite to the first direction. An optical Ethernet signal transmission system comprising a second optical core network, wherein each remote device is connected. Detecting whether the first optical core network and the second optical core network are physically connected to form an NMS frame including the physical connection information, the gap between the NMS frame and the packet of the optical Ethernet signal (Inter Packet Gap (IPG) is transmitted to the control means, the control means is characterized in that the switching of the plurality of remote devices using the received NMS frame.
In the normal state, the central device transmits the optical Ethernet signal to the plurality of remote devices in the first direction through the first optical core network, and an abnormality occurs in at least one or more sections of the first optical core network. And transmitting the optical Ethernet signal to the plurality of remote devices in the second direction through the second optical core network.

The optical Ethernet signal transmission method transmits the optical Ethernet signal to the plurality of remote devices in the first direction through the first optical core network when an error occurs in at least one or more sections in the second optical core network. It may further include a method.

In the optical Ethernet signal transmission method, when an abnormality occurs in at least one or more sections in both the first optical core network and the second optical core network, the connection section starts from the central apparatus in the first direction and is effective with the remote apparatus. A third optical core network is established by interworking with the first optical core network and the second optical core network, and transmits the optical Ethernet signal, starting from the central unit in the second direction, and effectively connecting with the remote apparatus. The method may further include a method of transmitting the optical Ethernet signal by establishing a fourth optical core network by interworking the second optical core network and the first optical core network having a section.

In the optical Ethernet signal transmission method, in the case of a remote device not belonging to the third optical core network and the fourth optical core network, a fifth core may be used by valid connection intervals of the first and second optical core networks between remote devices. The method may further include a method of transmitting a data by establishing a network.

The control means of the central unit includes a field programmable gate array (FPGA), which operates independently without being operated in connection with a separate central processing unit, and controls switching of the first optical core network and the second optical core network. can do.

The plurality of remote devices may be configured in a plug-in manner such that each remote device may be connected to the first optical core network and the second optical core network.

Preferably, it may take a time of about 4 ms to return after the control means is transferred. The optical Ethernet transmission system may not include a separate router for a software protocol.

Also, except in the case of a portion forming a new loop for switching, when a signal is transmitted from the first optical core network to the remote device, the signal is transmitted to the next remote device or the central apparatus through the first optical core network. When a signal is transmitted and a signal is transmitted from the second optical core network to the remote device, a signal may be transmitted to the next remote device or the central device through the second optical core network.

Therefore, according to the present invention, as the network is switched by hardware processing by its own protocol for stable traffic delivery, it is possible to deliver reliable data within a maximum of 4ms until the network return time after the network switchover.

In addition, as a control signal is transmitted and received in an inter packet gap (IPG), more than about 99% of packets can be used for data transmission, unlike the conventional method including control information in a packet. It is effective to maximize data communication efficiency.

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

1 is a schematic diagram showing the flow of data in the normal state of the optical Ethernet signal transmission system according to an embodiment of the present invention.

Referring to FIG. 1, an optical Ethernet signal transmission system according to an embodiment of the present invention includes a plurality of remote devices 121, 122, 123, 124, 125, and 126, a central device 110, a first optical core network, and And a second optical core network. The plurality of remote devices 121, 122, 123, 124, 125, and 126 include a distribution automation terminal, a remote meter reading terminal, a load management terminal, and the like. In addition, it can be a factory automation terminal, a terminal for pole and underground transformation, a power line communication device, a wireless internet device, and the like, and can also be used in various fields such as voice call, CCTV, and LED display board. have. The remote device may be widely applied to a general device configured as an optical communication network in addition to the illustrated ones.

The central device 110 comprises an optical signal changing means and a control means. The optical signal changing means mutually converts an Ethernet signal and an optical Ethernet signal. The Ethernet signal may include an RS-232 asynchronous signal, a voice IP signal (VoIP), a video signal or data of 1200 bps to 57.6 kbps.

The central unit 110 receives various server data coming into a network as an Ethernet frame of Transmission Control Protocol / Internet Protocol (TCP / IP), and reconfigures the central unit to an optical signal according to a service. In this case, the optical signal may be converted into a TCP / IP frame having a transmission width of the 100base-FX band. The converted TCP / IP frame then physically delivers data via a dual ring configuration via Electronic to Optical.

The concept used by the central device 110 is different from the SDH-based system applied to the existing annular network system, and is applied to the annular network system using general Ethernet. In this case, the information transmitted through the Ethernet is not formed a separate channel, but operates with a variable bandwidth (at least 64Bype ~ huge frame (1916Byte), and up to jumbo packets).
The first optical core network and the second optical core network are connected in a ring configuration to the plurality of remote devices 121, 122, 123, 124, 125, 126. The first optical core network starts from the central unit 110 and passes through each remote unit back to the central unit 110 to form a ring configuration. The second optical core network also forms a ring configuration via the central device 110 and each remote device. As a result, the first optical core network and the second optical core network form a redundant ring configuration with the central device 110 and the remote devices 121, 122, 123, 124, 125, and 126.

The first optical core network transmits data converted into an optical signal only in a first direction, and the second optical core network transmits the data only in a second direction opposite to the first direction. Only when the first optical core network and the second optical core network transfer data in opposite directions, a partial ring configuration is possible when switching later. The first optical core network, the second optical core network, and the remote devices are configured in a plug in manner, thereby providing excellent expandability and easily adding a unit.

In the case of the existing Ethernet transmission system, in order to perform data communication from one point to another, transmission and reception are performed in both directions through one line. For example, transmission and reception are performed bidirectionally through a line between the central unit and the first or last remote unit or between each remote unit. In contrast, the optical Ethernet signal transmission system according to the present invention transmits and receives data in a first direction in the first optical core network and in a second direction in the second optical core network. Since the second optical core network consists of a ring, even if data is transmitted in one direction, data can be transmitted and received from any point in the network system to another point.

In addition, since the optical Ethernet signal transmission system according to the present invention uses a TCP / IP type Ethernet frame away from the configuration of the conventional PDH (Plesiochronous Digital Hierarchy) or SDH (Synchronous Digital Hierarchy) series of layered equipment, when configuring the network Economics can be constructed without building additional systems. Therefore, the compatibility with the existing system is excellent.

Referring back to FIG. 1, FIG. 1 shows the optical Ethernet signal transmission flow in a general state. Both the first optical core network and the second optical core network maintain a normal communication state, and at this time, an optical Ethernet signal is transmitted through the first optical core network. As shown in FIG. 1, the flow of data 910 in this case coincides with the first direction.

FIG. 2 is a schematic diagram illustrating a data flow when an error occurs in a second optical core network of an optical Ethernet signal transmission system according to an embodiment of the present invention.

Referring to FIG. 2, an abnormality has occurred in the second optical core network between the third remote device 123 and the fourth remote device 124. In this case, since there is no problem with the data flow 910 in the first direction, which is a general data flow direction, data is transmitted using the first optical core network in the same first direction as the flow of the optical Ethernet signal in a general state. .

3 is a schematic diagram illustrating a flow of data 920 when an error occurs in a first optical core network of an optical Ethernet signal transmission system according to an embodiment of the present invention.

Referring to FIG. 3, an abnormality has occurred in a part of the first optical core network existing in the second remote device 122 and the third remote device 123, and in this case, the abnormality occurs through the first optical core network. Since the entire loop cannot be formed, data is transmitted in the second direction through the second optical core network (920). In this case, the central unit 110 detects an abnormality of the first optical core network in the first direction in hardware and performs a transfer to transfer data through the second optical core network immediately, and other software control. It is possible to switch in a very short time because there is no. In the optical Ethernet signal transmission system according to an embodiment of the present invention, switching is controlled by hardware using a field-programmable gate array (FPGA). In the case of the transfer by the existing software, the control signals for the transfer are carried on the real traffic and transmitted, and in order to control the transfer, the transfer is performed using a separate resource from the computer in charge of the control. Therefore, when the transfer is performed by the existing software method, it takes hundreds of milliseconds (ms) to recover through the transfer, and a lot of added routers are added when connecting to the upper network using a company-specific software technique. There is a disadvantage that requires additional equipment. On the contrary, in the optical Ethernet signal transmission system according to an embodiment of the present invention, since the switching is performed in hardware, the optical Ethernet signal transmission system can be used as it is in the existing equipment by being compatible with general Ethernet equipment without using resources on a separate system. In addition, since the changeover is performed by hardware, it is possible to determine the abnormality of the network and transfer reliable data within a maximum of 4 milliseconds (ms) until recovery after the changeover of the network.

In addition, by transmitting the control signals used in the switching in the Inter Packet Gap (IPG), it is necessary to transmit more than 99% of the actual data of the packet compared to the conventional method using a certain portion of the packet Can be used. As mentioned above, in the conventional system, since control signals are carried on packets, many control signals are placed on packets that need to carry actual data when these control signals are accumulated or complicated. Therefore, the actual traffic data amount is significantly reduced. However, in the optical Ethernet signal transmission system according to the present embodiment, traffic loss can be significantly reduced by not placing a control signal on a packet. For example, for a 100 Mbyte redundant optical communication ring, the actual Ethernet transport traffic capacity can be implemented to be 99 Mbyte or more.

FIG. 4 is a schematic diagram illustrating the flow of data when an abnormality occurs simultaneously in the first and second optical core networks of the optical Ethernet signal transmission system according to an embodiment of the present invention.

Referring to FIG. 4, the first optical core network and the second optical core network are abnormally simultaneously formed between the third remote device 123 and the fourth remote device 124. In this case, the first remote device 121, the second remote device 122, and the third remote device 123 of the first optical core network through the portion of the first optical core network from the central device 110 in the first direction. In order, followed by the third remote device 123, the second remote device 122, the first remote device 121, and the central device 110 through a portion of the second optical core network in the second direction. Are connected to form a third optical core network 930 which is an entire loop.

Similarly, the sixth remote device 126, the fifth remote device 125, and the fourth remote device 124 may be started using the part of the second optical core network in the second direction starting from the central device 110. And then the entire loop using a portion of the first optical core network in the order of the fourth remote device 124, the fifth remote device 125, the sixth remote device 126 and the central device 110 in that order. The fourth optical core network 940 is formed.

Therefore, even if an abnormality occurs in the connection between the third remote device 123 and the fourth remote device 124, all of the remote devices 121, 122, 123, 124, 125, 126 through this switching. Maintain network connected devices.

FIG. 5 is a schematic diagram illustrating a flow of data when an abnormality occurs simultaneously in the first and second optical core networks of the optical Ethernet signal transmission system according to an embodiment of the present invention.

Referring to FIG. 5, unlike the structure of the network illustrated in FIG. 4, a portion where an abnormality occurs between the first optical core network and the second optical core network occurs. In this case, as in the case of FIG. 4, the third optical core network 930 and the fourth optical core network 940 may be configured up to a portion that can be connected, and a fifth optical core network may be formed by forming loops between remote devices separated from each other. Configure 950. In FIG. 5, the third optical core network connects the first remote device 121 and the second remote device 122 in a first direction from the central device 110 using a portion of the first optical core. Then, the second remote device 122, the first remote device 121, and the central device 110 are configured using a part of the second optical core network in the second direction. Similarly to the case of FIG. 4, the fourth optical core network also includes the central device 110, the sixth remote device 126, the fifth remote device 125, and again the sixth remote device 126 and the central device 110. ) In order.

6 is a schematic diagram illustrating a central office terminal (COT) of an optical Ethernet signal transmission system according to an embodiment of the present invention.

The central office terminal (COT) may include a Main Processor Unit (MPU) 112, an Ethernet Transmission & Receive (ETR) 113, a Power 111, and a Rear Extension Card (REX). The MPU 112 initializes a system and functions to mount or monitor a unit. It also controls the provisioning of the unit, configures it, and backs up data. In addition, the power may be configured in redundancy.

The COT may control a central device and a remote device through an NMS (Network Management System). The NMS system may be configured to be easily controlled by a user using a graphical user interface (GUI). The NMS system can operate to maintain security for all devices and devices that are not authenticated from its own NMS without a separate firewall for efficient network management and security. In addition, in order to increase the efficiency of maintenance in the terminal device in the field it may be equipped with an RF (Radio Frequency) radio module to the outside to check the status of the equipment through the wireless module.

In the case of a COT according to an embodiment of the present invention, the standard-alone type 19-inch shelf is configured, and the COT cards are easily plugged in a plug-in manner. You can also configure up to 30 remote devices per system, up to five rings. In addition, COT can be used as a standalone type, such as RT to connect one ring can be used.

In addition, the MPU 112 and the ETR 113 may be integrally formed. The ETR 113 is composed of a base board, and the MPU 112 is mounted as a daughter board of the ETR 113. One ring may be configured by combining the MPU 112 and the ETR 113. 7 is a schematic diagram illustrating an actual network configuration of an optical Ethernet signal transmission system according to another embodiment of the present invention.

7, the optical Ethernet signal transmission system according to another embodiment of the present invention is a COT 210, remote devices (221, 222, 223, 224, ..., 225), video cameras (231, 232, 233, 234, ..., 235). The remote devices are each connected with a video camera. In this case, the present invention can be applied to a surveillance system, a traffic management system, and the like, and the COT 210 and the remote devices 221, 222, 223, 224,..., 225 are formed of a redundant optical core network. COT 210 transmits the data of the remote devices as described in FIGS.

The COT 210 may collect various data of the remote devices and transmit the data to a separate network, and may control the remote devices remotely from the network or use various data collected from the video camera. Configure.

8 is a schematic diagram illustrating a block diagram of an optical Ethernet signal transmission system according to another embodiment of the present invention.

Referring to FIG. 8, the optical Ethernet signal transmission system includes an Ethernet frame controller 810, a first optical port 821, a second optical port 822, a first LAN port 831, and a second LAN port. 832, memory block 860, and CPU interface 850.

The optical Ethernet signal transmission system also includes an optical interface 841, a physical management 842, an inter-integrated circuit (I2C) interface 841, a serial peripheral interface (SPI) 844, a status LED control unit 845, and a LAN. The apparatus may further include a LAN to serial interface 846.

The Ethernet frame controller 810 controls the flow of the optical Ethernet signal, and automatically forwards. In addition, MAC addresses can be filtered, and NMS frames can be searched. It can count the number of remote devices and monitor the status of the ring (network). Finally, it functions to test the optical loop back.

The first optical port 821 and the second optical port 822 constitute each ring and are connected to remote devices. In addition, the first LAN port 831 and the second LAN port 832 serve to transmit and receive data and control signals from the outside.

The memory block 860 stores various necessary data. For example, it may store a MAC address or buffer Ethernet packets.

The CPU interface 850 may transmit and receive the NMS command and state, and read or write a MAC address. In addition, an NMS frame may be generated.

In the detailed description of the present invention described above with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary skill in the art will be described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

1 is an explanatory diagram showing the flow of data in the normal state of an optical Ethernet signal transmission system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a data flow when an error occurs in a second optical core network of an optical Ethernet signal transmission system according to an embodiment of the present invention.

3 is a schematic diagram illustrating a flow of data when an abnormality occurs in a first optical core network of an optical Ethernet signal transmission system according to an embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating the flow of data when an abnormality occurs simultaneously in the first and second optical core networks of the optical Ethernet signal transmission system according to an embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a flow of data when an abnormality occurs simultaneously in the first and second optical core networks of the optical Ethernet signal transmission system according to an embodiment of the present invention.

6 is a schematic diagram illustrating a central office terminal (COT) of an optical Ethernet signal transmission system according to an embodiment of the present invention.

7 is a schematic diagram illustrating an actual network configuration of an optical Ethernet signal transmission system according to another embodiment of the present invention.

8 is a schematic diagram illustrating a block diagram of an optical Ethernet signal transmission system according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110, 210: central unit

121, 122, 123, 124, 125, 126: remote device

221, 222, 223, 224, 225: remote device

231, 232, 233, 234, 235: video camera

111: power 112: MPU

113: ETR

Claims (11)

A plurality of remote devices; A central unit including optical signal changing means for converting an Ethernet signal and an optical Ethernet signal to each other, and control means for controlling the optical Ethernet signals provided to the plurality of remote devices, and performing switching when an abnormality occurs in a network; A first optical core network starting from the central unit and interlocked with the central unit again through the plurality of remote units and having an annular structure and transmitting optical data in a first direction; And A second optical core network starting from the central unit and interlocked with the central unit again through the plurality of remote units and having an annular structure and transmitting data in a second direction opposite to the first direction; In the optical Ethernet signal transmission system comprising: Each remote device detects the physical connection of the connected first optical core network and the second optical core network to form an NMS frame including the physical connection information. The NMS frame is transmitted to a control means through the adjacent remote device using an Inter Packet Gap (IPG) existing between packets of the optical Ethernet signal, The control means for transmitting the optical Ethernet signal, characterized in that for performing the switching of a plurality of remote devices using the received NMS frame. The method of claim 1, And in the normal state, the central device transmits (910) the optical Ethernet signal only to the first direction to the plurality of remote devices via the first optical core network only. The method of claim 1, When an error occurs in at least one or more sections of the first optical core network, a method of transmitting (920) the optical Ethernet signal to the plurality of remote devices only in the second direction through the second optical core network alone. Optical Ethernet signal transmission method comprising. The method of claim 1, When an abnormality occurs in at least one or more sections of the second optical core network, And transmitting (910) the optical Ethernet signal only in the first direction to the plurality of remote devices via the first optical core network only. The method of claim 1, When an abnormality occurs in at least one or more sections in both the first optical core network and the second optical core network, Starting from the central device in the first direction and interworking the first optical core network and the second optical core network having a valid connection interval with the remote device to establish a third optical core network to transmit the optical Ethernet signal ( 930), Starting from the central unit in the second direction and interworking the second optical core network and the first optical core network having a valid connection section with the remote device to establish a fourth optical core network to transmit the optical Ethernet signal ( 940) further comprising an optical Ethernet signal transmission method. The method of claim 3, In the case of a remote device not belonging to the third optical core network and the fourth optical core network, data is transmitted by establishing a fifth core network using valid connection intervals of the first and second optical core networks between the remote devices. And a method (950). The method of claim 1, The control means of the central unit includes a field programmable gate array (FPGA), which operates independently without being operated in connection with a separate central processing unit, and controls switching of the first optical core network and the second optical core network. Optical Ethernet signal transmission method characterized in that. The method of claim 1, And wherein the plurality of remote devices are configured in a plug-in manner such that each remote device is connected to the first optical core network and the second optical core network. The optical Ethernet signal transmission method according to claim 1, wherein it takes less than 4 ms to return after the control means is transferred. The method of claim 1, wherein the optical Ethernet transmission system does not include a separate router for a software protocol. The optical Ethernet signal of claim 4 or 5, wherein the optical Ethernet signal is transmitted only in the first direction on the first optical core network, and the optical Ethernet signal is transmitted only in the second direction on the second optical core network. Optical Ethernet signal transmission method, characterized in that.

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