• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.24 no.6B
• /
• pp.1059-1067
• /
• 1999

In this paper characteristics of ATM-PON is described and a TC layer controller for ATM-PON OLT is designed. This paper proposes an algorithm of economically controlling the grant information written by CPU to dynamically allocate the upstream bandwidth on the PON among the ONUs in a fair way and of encrypting the downstream data using a lower standard of encryption, termed data churning, which is used to distinguish it from existing transmission system scramblers and higher layer encryption methods. This paper also proposes a method of allocating churning-related message into the PLOAM cell in order to synchronously change the churning key between the OLT and the ONU.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.8 no.1
• /
• pp.57-64
• /
• 2004

Passive optical network that use passive component is economical network, and can provide service of high speed to subscribers. The function of VPN which is operated like private network is needed to many companies. There are two methods to implement VPN over ATM-PON. One is located at ONU and OLT system and another is located at core network. In this paper, we implemented to SCB and P2P adding VPN function to ONU and OLT of ATM-PON system. We knew that the proposed method has more fast transmission and more small traffic than other method in the field of the performance.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2001.05a
• /
• pp.125-128
• /
• 2001

Earlier efforts on optical access concentrated on the design of PONs for the collection and distribution portion of the access network. PON architecture is very simple but it requires MAC protocol for control of upstream traffic. This paper proposes a MAC protocol for a broadband access network using an ATM Passive Optical Network supporting CBR/rtVBR, nrtVBR, ABR aild UBR traffic. For the proposed MAC scheme, we present grant field format, minislot format, and bandwidth allocation algorithm.

• Journal of KIISE:Information Networking
• /
• v.29 no.1
• /
• pp.40-47
• /
• 2002

This paper analyzes the performance of an optical line termination system in ATM based Passive Optical Network(PON) using the operational analysis. We analyze it using system parameters such as utilization, throughput and routing frequency based on the buffer structure in each block of ATM-PON. Furthermore, we derive the mean response time and the visit ratio of each block, and then search the bottleneck block that hinders the system performance. We found that the 622Mbps 16x16 switching block is the bottleneck block for ATM-PON. In this bottleneck block, the loss probability increases rapidly when the cell arrival rate increases.

• Proceedings of the Korea Multimedia Society Conference
• /
• 1998.10a
• /
• pp.174-178
• /
• 1998

FASN GX는 광대역 서비스를 제공하기에 적합한 ATM-PON 시스템을 경제적인 구축의 방법으로 설정하였다. 현재, 다수의 통신 사업자들은 가입자망 구조로서 ATM-PON 시스템 구조를 채택하고 있는 실정이다. ATM-PON 시스템의 상향에서는 멀티플렉싱이 발생한다. 그러므로 멀티플렉싱의 효과적인 자원을 위해서 매체접근제어 프로토콜이 구비되어야 한다. 실제로, 충돌 해결을 위한 알고리즘으로서 tree 알고리즘을 제안하는 많은 MAC 프로토콜 제안서가 있다.[1,2,3,4] 이 tree 알고리즘은 안정되고, 예측 가능하고, 실행 가능한 주요 장점을 제공한다. 그러나 이 알고리즘은 시간에 민감한 높은 우선순위의 트래픽이 들어올 경우에는 성능이 좋지 못하다. 이 논문에서는 ATM 환경의 멀티레벨 서비스를 지원하는데 유용한 새로운 DQT(Double Queue Tree based)알고리즘을 제안한다. 그리고 알고리즘의 처리시간과 지연시간을 IEEE802.14에서 제안된 Tree 알고리즘과 비교하여 시뮬레이션 결과를 제시한다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.25 no.11A
• /
• pp.1691-1698
• /
• 2000

ATM-PON은 다중점 연결을 가능케 하는 망으로 이의 핵심 기술에는 레인징 기술이 포함된다. 하지만 이 레인징 기술 측면에서는 ATM-PON 망의 생존성을 고려해 볼 때, ATM-PON 시스템이 망 장애에도 불구하고 가입자에게 계속적인 서비스를 제공하기 위해서는 대체선로로의 보호 절제를 수행해야 하나 이때 주로 선로와 대체 선로 간의 거리차에 의한 트래픽 충돌 문제가 발생한다. 본 논문에서는 보호 절제가 일어날 때 이러한 레이징의 문제를 해결하기 위하여 전송 지연 초기 결정 방식(방안1), OLT 내 지연 방식(방안 2), 혼합형 방식(방안 3)의 세가지 해결 방안을 제안하였고, ITU-T G.983.1에서 제시한 네 가지 보호 절제 구성을 통해 각 방식을 비교 분석하였으며, 이들의 장. 단점을 파악하여 각각의 시스템에 적합한 방식을 제시하였다.

• The KIPS Transactions:PartC
• /
• v.9C no.4
• /
• pp.523-530
• /
• 2002

Earlier efforts on optical access concentrated on the design of PONs for the collection and distribution portion of the access network. PON architecture is very simple but it requires MAC protocol for control of upstream traffic. This paper proposes a MAC protocol for a broadband access network using an ATM Passive Optical Network supporting CBR/rtYBR, nrtYBR, UBR and ABR traffic. For the proposed MAC scheme, we present grant field format, minislot format, and bandwidth allocation algorithm. From the simulation result, we have confirmed that our proposed scheme can reduce the average cell delay in comparison to that of conventional MAC schemes.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2001.10a
• /
• pp.353-356
• /
• 2001

Earlier efforts on optical access concentrated on the design of PONs for the collection and distribution portion of the access network. PON architecture is very simple but it requires MAC protocol for control of upstream traffic. This paper proposes a MAC protocol for a broadband access network using an ATM Passive Optical Network supporting CBR/rtVBR, nrtVBR, UBR and ABR traffic. For the proposed MAC scheme, we present grant field format, minislot format, and bandwidth allocation algorithm. from the simulation result, we have confirmed that our proposed scheme ran reduce the average tell delay in comparison to that of conventional MAC schemes.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.38 no.9
• /
• pp.12-20
• /
• 2001

The ATM-PON has an important meaning at next generation access network because the equipment transmits various types of user traffic with a single platform through the passive optical splitter. Ranging is a technology to place all ONUs at the same virtual distance in order to provide the synchronization for the upstream signal in the ATM-PON based on the Time Division Multiplexing (TDM). In this paper, we review the merits of ATM PON and related protocol for the PON operation. We summarize and analyze the steps about the ranging protocol based on ITU-T G.983.1 and implement a simulator that can simulate the ranging procedure based on our modeling. In this paper, we can investigate time requirements of G.983.1 by using the simulator and find out the wasted rate of the bandwidth during the ranging procedure in order to know the influence for ONUs while ATM-PON is in-service. Also, we show that a new ranging scheme reducing window size can avoid the degradation of quality of service of ONUs in service with simulation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2002.11a
• /
• pp.306-310
• /
• 2002

Today, corporations are approach to inside information using public network such as Internet groping economical way to utilize public network to corporation information network without buying equipment. But, special quality of internet, Virtual Private Net (VPN) that it uses net that is observed as technology that can be guaranteed public safety division transmission and data securitybecause of can not secure data transmission. In this paper. add VPN function ONU&OLT of ATM-PON system and propose SCB (Single Copy Broadcasting). When there is VPN function to ATM network, the speed can be fast, and reduce rain track pick quantity during time more. Performance analysis network simulation that use NS-2.