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Performance of MAC frame Fragmentation and Efficient Flow Control Schemes for Synchronous Ethernet Systems  

Choi Hee-Kyoung (한국항공대학교 정보통신공학과 응용네트워크연구실)
Yoon Chong-Ho (한국항공대학교 정보통신공학과 응용네트워크연구실)
Cho Jae-Hun (삼성전자 통신연구소)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.12B, 2005 , pp. 838-846 More about this Journal
Abstract
In this paper, we consider the following two issues for implementing the synchronous Ethernet systems. First, a synchronous Ethernet system employs a fixed size superframe which is divided into a synchronous period and an asynchronous one. We note that the starting point of a superframe is not deterministic when an ordinary data frame's transmission is overlapped the superframe boundary. This overlap may be a fatal drawback for strict jitter bounded applications. Circumventing the problem, we propose a frame fragmentation scheme to provide a zero jitter, and compare its delay performance with the hold scheme which also provides the zero jitter. We next concern that IEEE 802.3x pause frames cannot be promptly transmitted in a synchronous period, and thus asynchronous traffics may be dramatically get dropped at the input buffer of a switch. To handle the problem, we propose an efficient flow control by allowing the transmission of the pause frame in a synchronous period, and investigate the blocking probability of the asynchronous traffics by the simulation.
Keywords
Synchronous Ethernet; Superframe; Fragmentation; IEEE 802.3x pause frame;
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