KR100905093B1 - Intelligent optical transmitter - Google Patents

Abstract

The present invention integrates various types of data such as Ethernet, serial, E1 / T1 transmission, real-time video and audio compression transmission with the introduction of RPR technology, which is essential for ring structure by Ethernet. Effortlessly manage multiple devices through enhanced monitoring by converting to Ethernet system and transmitting to the 1.25Gbps Ethernet Ring at high speed and by monitoring the status of various devices in the NMS system. It provides breakthrough convenience in maintenance by analyzing and diagnosing the RTU (terminal device) protocol under the ring.

Ethernet, ring structure, RPR, PCI bus, EPLD

Description

Intelligent optical transmitter

1 to 3 are diagrams for explaining the ring configuration used in the conventional ITS, IBS and the like;

4 is a view for explaining an optical Ethernet transmission apparatus according to the present invention;

5 is a view for explaining an intelligent optical transmission device according to the present invention in detail;

FIG. 6 is a diagram for describing an interface between the processor 107 and the RPR signal processor 103 of FIG. 5.

<Description of reference numbers for the main parts of the drawings>

101: bypass switching unit 102: optical Ethernet converter

103: RPR signal processing unit 104: interface unit

105: Ethernet switching unit 106: supervisory card

107: processor 108: memory

The present invention relates to an intelligent optical transmission device, and more particularly, to an intelligent optical transmission device that facilitates the flow and control of data by connecting a central monitoring unit and a remote terminal of a remote monitoring system in a ring type using optical fibers. will be.

Optical communication is a communication method that transmits information through a fiber optic cable, unlike a wired communication using a core wire or a wireless communication using a frequency. In the early 1970s, Corning was the first to manufacture optical fibers, and since then, lasers suitable for optical communications can be oscillated at room temperature, creating a new era of practical optical communications.

Currently, the infrastructure is constructed in the form of transmitting various signals such as video, data, and Ethernet, respectively, and in particular, in the ring structure, there is an absolute shortage of equipment that accommodates various signals. Although some SDH / SONET structures transmit signals from various terminals, the SDH / SONET scheme is a voice-oriented protocol, which is not suitable for Ethernet-based Internet signals that are recently activated. This is because SDH / SONET is a structure in the past that is suitable for transmitting voice signals such as telephones. Recently, attempts have been actively made to convert them to Ethernet-based rings.

However, STP (Spanning Tree Protocol), a network recovery technology applied in the Ethernet ring structure, can cause delays of about 30 seconds, and new technologies for fast network recovery are not possible because Metro Ethernet is not available at these delay rates. This is the time needed.

 Accordingly, the technical problem to be achieved by the present invention is an Ethernet-based ring equipped with a resilient packet ring (RPR), which is recently rapidly attracting attention for metro Ethernet service. It is to provide an intelligent optical transmission device suitable for ITS, BIS, and ubiquitous environment by efficiently transmitting various complex signals such as Ethernet, contacts, and sensors.

 An intelligent optical transmission device according to the present invention for achieving the above technical problem, and includes a bypass switching unit, an optical Ethernet conversion unit, an RPR signal processing unit, an interface unit, an Ethernet switching unit, a signal conversion unit,

The bypass switching unit bypasses the optical signal coming from the external optical fiber to prevent the isolation of the node, and also provides a path for easily opening the packet moving in the ring by creating another optical path.

The optical Ethernet converter converts the optical Ethernet signal passing through the bypass switching unit into an electrical form and outputs the electrical signal to the RPR signal processor, and converts the Ethernet signal with the RPR function added from the RPR signal processor to light. Output to the bypass switch,

The RPR signal processor receives the signal output from the optical Ethernet converter and performs RPR processing operations such as space reuse, fairness, ring protection, etc.

The interface unit receives a signal output from the RPR signal processing unit, removes a protocol related to a ring, converts the original protocol into an original Ethernet signal, outputs the signal to the Ethernet switching unit, and receives a signal output from the Ethernet switching unit to process the ring. Adds a protocol and serves as an interface for outputting to the RPR signal processor;

The Ethernet switching unit connects the Ethernet signal output from the interface unit to the connected device, and simultaneously performs a switching function by tying various Ethernet signals coming from the lower stage into one,

The signal conversion unit receives a signal output from the Ethernet switching unit is characterized in that for converting it to a signal of various sites.

The RPR processing performed by the RPR signal processing unit is characterized by following the provisions of IEEE 802.17.

The present invention may include a monitoring card that can directly monitor the movement of the packet state through the passage provided by the bypass switching unit.

In the present invention, the optical Ethernet converter converts the optical Ethernet signal passing through the bypass switching unit into an electrical form, and then converts the signal in parallel to facilitate analysis and processing of the signal, and the interface unit outputs the signal from the RPR signal processor. And converts the parallel signal into a serial form and receives the signal output from the Ethernet switching unit.

A processor for controlling the RPR signal processor may be included. In this case, the RPR signal processor and the processor may be interfaced by a bus method.

The interface unit is preferably composed of EPLD.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. The following examples are only presented to understand the content of the present invention, and those skilled in the art will be capable of many modifications within the technical spirit of the present invention. Therefore, the scope of the present invention should not be construed as limited to these embodiments.

In the conventional ITS, IBS, etc., as shown in FIGS. 1 to 3, video and data transmission lines, Ethernet lines, modem lines, and the like, respectively, are implemented in a ring, and there is a lot of redundant investment in the network.

The present invention is a ring-type optical Ethernet transmission device basically applying the IEEE802.17 RPR international standard, as shown in FIG. 4, 64 to 256 nodes can be connected to a ring using two-core optical fibers. Various types of data such as data, sensors, contacts, telephone, video and audio data, T1 / E1, DS3, and OC3 between the device and each other are converted to Ethernet format and then transmitted at high speed. In addition, the ring protection algorithm defined in IEEE802.17 protects the network by steering and wrapping.

The optical transmission device according to the present invention is specialized in ITS, IBS and the like by allowing the interface for collecting external data implemented in the system to accommodate all the interfaces of various terminal devices. The current SDH / SONET series is TDM based, so the number of nodes is limited because of limited number of nodes (NODE) in general, but it is possible to greatly expand because it is currently available in 256 by Ethernet method and IP BASE in the future. Structure.

The present invention integrates various types of data such as Ethernet, serial, E1 / T1 transmission, telephone, real-time video and audio compression with the introduction of RPR technology, which is essential for ring structure by Ethernet. After converting into one Ethernet system, it transmits to the 1.25Gbps Ethernet Ring at high speed, and the NMS system is equipped with software that monitors the status of various devices. It aims to provide breakthrough convenience for maintenance by analyzing and diagnosing efficient management and RTU protocol under the ring. In addition, it is a structure that enables maintenance at a lower cost than existing products by adding functions for maintenance. The present invention has been developed from the existing network protection concept of Ethernet (Ethernet Ring) through core duplication to implement a network protection algorithm through an intelligent algorithm.

The overall structure of the intelligent optical transmission device according to the present invention is a ring type structure. It consists of outer ring and inner ring by two optical fibers and has a structure that is switched at both ends when cutting the optical fiber. According to the present invention, the node of the ring can be expanded at a low cost, thereby maximizing the number of nodes and maximizing the efficiency of the network when configuring the ring compared to the existing 30 nodes. The ring configuration of the existing SONET / SDH scheme has been limited in the number of ring nodes due to complex protocol configuration and signal synchronization problems. The present invention enables a significant increase in the number of nodes that can be processed in one ring using the Ethernet scheme. Do. That is, the present invention utilizes the feature of Ethernet that can be easily expanded by responding to each node by changing the address assigned to each node due to the nature of Ethernet moving in a packet unit. With 256 addresses currently available for allocation, you can scale up to 256 nodes to optimize cost-effectiveness. And there is a feature that can operate in a plurality of rings that can be connected to the ring.

Features of the RPR technology applied to the present invention are as follows.

RPR can transmit data in two directions, EAST or WEST during normal operation, and selects the ring with the shortest path to the receiving node and transmits the data. At this time, if a node or link failure occurs, it detects it and performs a series of protection procedures, and provides the function to provide continuous service through the bypass path.

The main operating features of the RPR chip are resiliency, spatial reuse, fairness, multicast, broadcast, and ring protection.

Resiliency detects when a node or link fails when transmitting data by selecting the ring with the shortest path to the receiving node in the process of transmitting data in both EAST or WEST due to the normal operation of RPR. By following a series of protection procedures, it is possible to provide continuous service by way of bypass.

In the case of the existing ring, the transmitted packet is removed from the transmitting node after passing through the ring through the receiving node, and the transmitting node elimination method adds a burden to unrelated nodes and rings. Bandwidth reduction occurs. RPR uses receiving node elimination instead of transmitting node elimination so that other nodes can reuse the bandwidth to make the most of the limited transmission band. This is the spatial reuse feature.

Fairness is the fair distribution of information when neighboring nodes are unable to deliver data due to high traffic from a specific node, thus preventing information imbalance due to band monopoly of a specific node, thereby delivering information of the entire network. It is a function to process smoothly.

5 is a view for explaining the intelligent light transmission apparatus according to the present invention.

FIG. 6 is a diagram for describing the bypass switching unit 101 of FIG. 5. Referring to FIG. 6, the bypass switching unit 101 includes an optical switch 101a and an optical branch element 101b. . The optical switch 101a performs a function of bypassing a corresponding block as it is through an external control in case of a power failure or a fault check of an optical signal coming from an external optical fiber, so that a power failure or fault check may be required at the same time in a ring. In this case, the intermediate node is prevented from being isolated. It also bypasses in case of track abnormality and supports overall track inspection. Bypassing each node in this way allows all nodes to be connected to a single fiber, which allows the OTDR to be added to check the blocking part of the fiber even from a remote location.

The optical splitter 101b provides a passage for easily opening a packet moving around the ring by generating another optical path, thereby helping the maintenance convenience. The supervisory card 106 directly monitors the movement of the packet state through the passage provided by the optical branch element 101b.

The optical Ethernet converter 102 is a block for processing the EAST and WEST optical signals inputted through the bypass switching unit 101, and converts the optical Ethernet signal passing through the bypass switching unit 101 into an electrical form. In order to facilitate the analysis and processing of the signal is converted in parallel and output to the RPR signal processing unit 103. In addition, the Ethernet signal with the RPR function added from the RPR signal processor 103 is converted into light and output to the bypass switching unit 101.

FIG. 7 is a diagram for describing the RPR signal processor 103 of FIG. 5. Referring to FIG. 7, the RPR signal processor 103 receives a signal output from the optical Ethernet converter 102 and performs the RPR process described above. The operation conforms to IEEE 802.17. The above-mentioned ring protection and transfer, fairness and space reuse are part of IEEE 802.17. The RPR signal processing unit 103 serves to process the operation of the entire system, interworking with the server PC through the control of the processor 107 and the memory 108. The RPR processing IC is installed in a structure directly interworking with the processor 107 so that the processor 107 knows the overall situation and controls an operation related to RPR through the RPR processing IC.

8 is a diagram for describing an interface between the processor 107 and the RPR signal processing unit 103. In order to facilitate the conversation between the processor 107 and the RPR chip 113, the PCI bus allows all information to be exchanged. To this end, hardware 114 for converting the PCI bus into a general parallel signal PARALLEL is installed between the processor 107 and the RPR chip 113. Since the interface between the processor 107 and the RPR chip 113 as a bus method can be applied to the development of various boards with only a small change in the minimum interface portion, so that the development of various boards has a low cost.

The processor 107 can greatly enhance the maintenance function of the device. That is, not only the device history, maintenance history, and device status of the device on a particular ring, but also the device history, maintenance history, device status, etc. of the other specific node through the node. Monitoring remotely can result in efficient maintenance.

The processor 107 is mounted on a NETWORK MANAGEMENT SOFTWARE (NMS) board. NMS is equipped with SNMP function, which is a standard protocol, so that when the integrated NMS is implemented with other devices, it can be directly interfaced without additional program work for protocol integration and other communication protocols such as TCP / IP, TELNET, RS 232 It can easily analyze the status of each device in the center or remote location, and it also functions as a gateway to raise the analyzed information to the upper level.

The optical Ethernet converter 102 measures the change in temperature, optical power, current, etc. and delivers it to the administrator through the NMS to remotely diagnose the environmental state of each node as well as to utilize the long-term DB data for aging of the optical fiber. It can have the additional function to observe the surrounding environment of the device in advance.

FIG. 9 is a diagram for describing the interface unit 104 of FIG. 5. Referring to FIG. 9, the interface unit 104 receives a signal output from the RPR signal processing unit 103 and removes a protocol related to a ring. Converts the parallel signal in series and converts it into the original Ethernet signal and outputs it to the Ethernet switching unit 105, receives the signal output from the Ethernet switching unit 105, converts it to parallel form, and adds the ring processing protocol (RPR). Header) to serve as an interface for outputting to the RPR signal processing unit 103.

There are two ways to perform this interface role using pure hardware, that is, EPLD, and a software method in a network process. In the present invention, a method using pure hardware is applied to simplify the system and lower the cost, thereby bringing it closer to commercialization. When using software, you should use a high-performance processor because of the processing speed of the processor, which requires a lot of work.However, when using EPLD, the system is simple and the processor is not involved in adding and removing RPR headers. The system is also driven reliably.

FIG. 10 is a diagram illustrating the Ethernet switching unit 105 of FIG. 5. Referring to FIG. 10, the Ethernet switching unit 105 connects an Ethernet signal output from the interface unit 104 to a connected device. At the same time, it plays a role of switching the various Ethernet signals coming from the lower stages into one. It also serves as a passage for transferring the status information of the connected device to the processor (017).

 The Ethernet signal inputted to each channel is tagged in the internal port tag to distinguish each port and then selected by the time slot control at an appropriate timing. After that, the signal processing unit performs signal processing as a whole structure. The processed signal is arranged in the form of Gigabit and then output to the Gigabit I / O port and output to the outside.

Since the Ethernet Switching Chip is used, there are various functions such as VLAN, a virtual LAN function, IPV4, a standard for setting IP, and IPV6, which has been newly defined to improve the address shortage caused by IPV4. It is the main purpose of the present invention to play a role. And since the specific operating condition setting is proceeded by firmware, 8bit microprocessor is additionally mounted on the board, so user can set the desired function according to the situation. Can be upgraded.

In the present invention, by using the backplane (backplane), each function block can be manufactured in the form of a card to decorate the equipment, or remove the backplane (backplane) can also decorate all the functions in one body. FIG. 11 is a diagram illustrating a case in which each of the functional blocks is installed in the form of a card using the former, that is, the backplane. In this case, the Ethernet switching unit 105 includes a backplane interface, and combines Ethernet and serial data to transfer terminal information to Ethernet, and status information of a device inserted into a backplane is dualized and transmitted in a serial manner. do. Therefore, not only stability and scalability can be achieved but also a very economical structure. That is, the present invention transmits the terminal information in a high speed serial method, which has recently been activated and proved to be effective in the Ethernet protocol.

In the past, the terminal information is transmitted in a bus method such as a PCI bus or a VME bus, that is, in a parallel manner. It has been an obstacle to high cost, stability, and capacity expansion. However, designing the backplane efficiently allows for the highest efficiency in an inexpensive way. The present invention can be seen as a ternary structure. In other words, it is divided into Ethernet bus which sends information of terminal to upper level, serial data bus which transmits status and history information of each card, and GPIO which informs whether each card is attached or detached. Can be implemented.

FIG. 12 is a diagram for describing the signal converter 109 of FIG. 5. Referring to FIG. 12, the signal converter 109 is a portion indicated by expansion boards a and b. After producing the necessary modules, connect the modules to the Ethernet switching unit (019) according to the needs of the consumer. For example, when a T1 / E1 signal, an image, an audio, a contact, or the like is inputted or outputted, a protocol conversion IC is used to input and output the Ethernet.

 The signal converter 109 receives the signal output from the Ethernet switching unit 105 and converts it into signals of various sites. That is, a block for converting serial signals to Ethernet, a block for converting power line communication module to Ethernet, a block for converting T1 / E1, DS3, contact, OC-3, power line communication module to Ethernet, video and audio The block that converts the signal to Ethernet after compressing the signal to MPEG and the block that converts the contact signal to Ethernet are configured to be selectively inserted. It is a structure that can transmit various field signals by configuring all these signals in a transmission system with an RPR function so that there is no problem in operating as a ring.

As described above, according to the present invention, it is possible to implement a ring without loss of data through the Ethernet method, and there is a low cost effect by transmitting various dependent signals in one device. In addition, the maintenance function is strengthened, and the efficiency of investment is high.

Claims (7)

It is a ring-type optical Ethernet transmission device, and is an intelligent optical transmission device based on the RPR system which is an Ethernet-based protocol. A bypass switching unit, an optical Ethernet conversion unit, an RPR signal processing unit, an interface unit, an Ethernet switching unit, a signal conversion unit, The bypass switching unit bypasses the optical signal coming from the external optical fiber to prevent the isolation of the node, and also provides a path for easily opening the packet moving in the ring by creating another optical path. The optical Ethernet converter converts the optical Ethernet signal passing through the bypass switching unit into an electrical form and outputs the electrical signal to the RPR signal processor, and converts the Ethernet signal with the RPR function added from the RPR signal processor to light. Output to the bypass switch, The RPR signal processor receives the signal output from the optical Ethernet converter and performs RPR processing operations such as space reuse, fairness, ring protection, etc. The interface unit receives a signal output from the RPR signal processing unit, removes a protocol related to a ring, converts the original protocol into an original Ethernet signal, outputs the signal to the Ethernet switching unit, and receives a signal output from the Ethernet switching unit to process the ring. Adds a protocol and serves as an interface for outputting to the RPR signal processor; The Ethernet switching unit connects the Ethernet signal output from the interface unit to the connected device, and simultaneously performs a switching function by tying various Ethernet signals coming from the lower stage into one, The signal conversion unit receives the signal output from the Ethernet switching unit intelligent optical transmission device, characterized in that for converting it to a signal of various sites. The intelligent optical transmission device according to claim 1, wherein the RPR processing performed by the RPR signal processing unit complies with IEEE 802.17. The intelligent optical transmission device according to claim 1, further comprising a monitoring card capable of directly monitoring the movement of the packet state through a passage provided by the bypass switching unit. The optical switch of claim 1, wherein the bypass switching unit includes an optical switch and an optical branching device, and a function of bypassing an optical signal from an external optical fiber to prevent isolation of a node is performed through the optical switch. Intelligent optical transmission device, characterized in that the function to provide a passage for creating a passage to easily open the packet to move around in the ring. The RPR signal processor of claim 1, wherein the optical Ethernet converter converts the optical Ethernet signal passing through the bypass switching unit into an electrical form, and then converts the optical Ethernet signal in parallel to facilitate analysis and processing of the signal. Intelligent optical transmission device, characterized in that for converting the parallel signal output from the in series and receiving the signal output from the Ethernet switching unit in parallel form. delete delete

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