• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.5B
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• pp.429-436
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• 2011

The G-PON is an efficient solution to implement the FTTH and have GEM frame to accomodate various protocols like Ethernet frames, IP packets, and TDM signals. Above all, the Ethernet is one of the most widely used 2nd layer protocol in the campus, the subscriber access, and the carrier service. So G-PON system has to provide an Ethernet interface with top priority. In this paper, we implement a gigabit Ethernet adapter based on Ethernet over GEM in the ITU-T G.984.3 to accommodate Ethernet protocol in the G-PON TC chip. The adapter maps each Ethernet frame to a single or multiple GEM frames and has several functions including generation of the GEM header, encapsulation of frames and the SAR. In particular, the adapter have converter (LUT) MAC address to port-ID which is a key to identify logical connections though it is not defined in specification but important. We implement the adapter with a FPGA and verify the functions of segmentation and reassembling, MAC address learning, and throughput with the logic analyzer and the Ethernet analyzer.

• Proceedings of the KIEE Conference
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• 2000.07a
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• pp.570-572
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• 2000

In this paper, we present the configuration of Direct Load Control System using TCP/Ethernet Module for the Load Management Europe and America has operated the DLC system by many communication system, and Taiwan, Japan has controlled the cooling load at peak hours of power system. Up to now, Many Researches for the DLC of communication method, so called, pager, power line carrier, ripple control, etc. has advanced. Now, we present new communication method for the DLC using TCP/Ethernet module which is widespread all over the world.

• ETRI Journal
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• v.29 no.2
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• pp.162-168
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• 2007

A new scheme for bi-directional HDTV/Gigabit Ethernet/CATV transmission over a hybrid dense-wavelength-division-multiplexing passive optical network (DWDM-PON) is proposed and demonstrated. It is based on injection-locked vertical-cavity surface-emitting lasers and distributed-feedback laser diodes as transmitters. Services with 129 HDTV channels, a 1.25 Gbps Gigabit Ethernet connection, and 77 CATV channels are successfully demonstrated over 40 km single-mode fiber links. Good performance of bit error rate, carrier-to-noise ratio, composite second order, and composite triple beat is achieved in our proposed bidirectional DWDM-PON.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.133.3-133
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• 2001

This paper analyses the real-time performance of Ethernet based intranet whether it is applicable to the real-time network. Unpredictability of transmission delay by collision-delay-retransmission mechanism in CAMA/CD(Carrier Sense Multiple Access with Collision Detect) of Ethernet is the major reason making hard to apply to real-time system. Both retransmission mechanism of TCP(Transmission Control Protocol) for reliability and sliding windows algorithm for high utilization make hard to predict transmission delay. Because real-time control network require fast responsibility and bustle of short-periodic messages, global-clock for collision avoidance and UDP(User Datagram Protocol) for high utilization of network are used. The mathematical models for time-delay that can be occured between ...

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.12B
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• pp.1601-1610
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• 2011

This paper discusses standardization activities, requirements and enabling technologies for 100G Ethernet and 100G OTN. The need of 100Gbps transport capacity has been gaining greater interest from service providers and carrier vendors. Moreover, optical transport networks based on OTN/DWDM are changing their properties to apply Ethernet traffic which is dramatically increasing. We realize and experimentally demonstrate OTU4 framer with commercial FPGA. The key features of the realized OTU4 framer are parallel signal processing function, multi-lane distribution function, GMP function and FEC function. The realized OTU4 framer has the large signal processing capacity of 120Gbps, which allows to transport about 120Gbps client signals such as $12{\times}10G$ Ethernet and $3{\times}40G$ Ethernet. The realized OTU4 framer has the advantages to quickly adjust to changing markets and new technologies by using commercial FPGA instead of ASIC.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.4
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• pp.1817-1823
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• 2011

OFDM Modulation is used for multimedia transmission At Urban Train. Recently the application field about data transmission is expanding the image as well. The case which the number of OFDM carrier is big is advantageous because multipass fading is big 18GHz wireless frequency. Existing WLAN which an ethernet transmission is possible is not suitable to a great distance transmission because number of carrier is 64. In this paper, we developed OFDM modem suitable to transmit broadband data at high speed train. A doppler compensation block added to offset the doppler effect. Therefore, the effectiveness is expected to be very big in field of urban train.

• Journal of the Korea Society of Computer and Information
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• v.10 no.6 s.38
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• pp.209-218
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• 2005

In this paper, we present an Active Optical Network(AON) . The AON uses the Dense Wavelength Division Multiplexing(DWDM) from optical communication access network of ring type, and will be able to provide the smoothly service in the Bandwidth on Demand by using DWDM. It supports the connection of the multiple wavelength and the Sub-Carrier from the optical gigabit ethernet switch. The Wavelength Add Drop Multiplexer(WADM) extracts a specific wavelength, and composes a node of the ring network. The specific wavelength becomes demultiplexing in the Sub-Carrier and it is distributed in the user The active connection of optical gigabit ethernet switch where the distribution of access network is started and access terminal connection equipment is possible. By the BoD from the AON it compares the buffer size which changes, and it analyzes. Also the Time delay of bit compares with the throughput of server The limit of amount of time is decided. Consequently it will be able to realize the dynamic use protocol and an efficient algorithm of the network.

• ETRI Journal
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• v.34 no.2
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• pp.199-209
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• 2012

In transport networks, a multi-ring architecture is very useful to facilitate network planning and to design and provide more resilient services for customers. Unlike traditional synchronous optical network multi-rings, the service resiliency of Ethernet-based multi-rings is significantly impacted by the ring hierarchy because a link or node failure in a certain level ring triggers filtering database flush actions in all higher level rings as well as in the ring with the failure, and consequently a large amount of duplicated data frames may be flooded. In this paper, we investigate how the ring hierarchy impacts the service resiliency of multi-ring networks. Based on extensive experiments on various single- and multiple-link failures, we suggest two effective inter-ring connection rules to minimize the transient traffic and to ensure more resilient multi-ring networks. In addition, we consider a flush optimization technique called e-ADV, and show that the combination of e-ADV and multi-ring structures satisfying our inter-ring connection rules results in a more attractive survivability performance.

• Electronics and Telecommunications Trends
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• v.21 no.6 s.102
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• pp.64-76
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• 2006

최초의 이더넷 IEEE 표준인 48비트 주소체계와 버스 토폴로지를 갖는 10Mbps 이더넷이 1985년에 승인받은 이후, 이더넷 기술은 1995년 100Mbps 이더넷, 1998년 1Gbps 이더넷, 2002년 10G 이더넷 표준 등장으로, 전송 용량을 10배씩 높이는 기술 발전이 표준으로 완성까지 시간이 오히려 짧아질 정도로 숨가쁘게 진화를 거듭하였다. 이더넷 전송 용량의 급속한 증가는 LAN과 WAN간 액세스 속도 차이를 급속하게 줄이는 결과를 가져와, 그렇지 않아도 대역폭 제한과 유연성 결여로 문제가 되던 전통적인last mile WAN 서비스를 대체하는 것을 시작으로 결국에는 pure Ethernet WAN transport 기술로 캐리어 이더넷이라는 새로운 이더넷 적용 분야가 등장하게 되었다. 이 글에서는 캐리어 이더넷 네트워크 서비스의 출현 과정과 서비스 특징을 소개하며, 캐리어 이더넷 네트워크 구조 관련 요소 기술로 이더넷의 백본 확장 기술, OAM, resilience, QoS 기술 동향을 정리하고, 마지막으로 캐리어 이더넷 개발 현황과 향후발전 전망에 대하여 살펴본다.

• Electronics and Telecommunications Trends
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• v.20 no.6 s.96
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• pp.110-121
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• 2005

LAN에서 사용되던 이더넷 기술은 단순성과 낮은 투자/운용 비용으로 인하여 WAN/MAN 영역으로까지 사용이 급속도로 확산되고 있다. 캐리어급 이더넷 OAM 기술은LAN 중심의 이더넷 기술을 캐리어급 망에서 사용할 수 있게 해주는 주요 기술로IEEE, ITU-T, MEF 등 표준화 기구에서 이에 대한 표준화가 진행되고 있다. 본 논문에서는 크게 PHY 계층과 MAC 계층의 두 부분으로 구성된 이더넷에서 단일 링크 상에서 발생하는 동작들을 처리하는 ETY 계층 OAM 기술과 다중 링크로 연결된 이더넷 경로상에서 발생하는 동작들을 처리하는 ETH 계층 OAM에 대한 기술을 분석하여 정리한다.