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�������պ����ѧѧ�� 2008, Vol. 34 Issue (04) :396-399    DOI:
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�ξ�Զ, �Ŵ���, ʷ����*
�������պ����ѧ ������ѧ���繤��ѧԺ, ���� 100083
QoS analysis on IEEE- 1394b fiber optical bus system
Duan Jingyuan, Zhang Chunxi, Shi Jieqin*
School of Instrument Science and Opto-electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ Ϊ�������ϵͳ�������ӳٺ���������,��Ӧ�������ϵ�IEEE-1394b��������ϵͳ�����˴���Ԥ�����ƺ�ƽ����Ӧʱ��ȹؼ����Եķ���.����IEEE-1394bЭ��Ĵ���Ԥ������,����˵�ʱ���ݴ�����첽���ݴ���ķ�������(QoS,Quality of Service)���������(ӲQoS).��QoS����׼����Ƶĵ�ʱ���첽�����ϵ������,�����Ŷ��۽�����IEEE-1394b�첽�����QoS����(��QoS),�õ��˺�����Ӧ���ʱ��,IEEE-1394b�첽������е�ƽ����Ӧʱ��.���ͨ��IEEE-1394b��������ʵ��ϵͳ������IEEE-1394b��QoS��������,��֤�����۷������.��IEEE-1394b������QoS����ƾ���һ����ָ������.
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Abstract�� In order to solve the problem of network delay and information obstacle in avionics system, the key characteristics which are bandwidth reservation mechanism and average response time of IEEE-1394b fiber optical bus system used in avionics system were analyzed. The equation which the QoS (quality of service)of isochronous data transfer and asynchronous data transfer must satisfy was derived (hard QoS) on the ground of bandwidth reservation mechanism in IEEE-1394b protocol. Considering the mixture of isochronous and asynchronous requests in admission control for QoS service, the QoS of asynchronous requests was analyzed based on queuing theory (soft QoS). For the case of ignoring reply interval, the average response time of IEEE-1394b asynchronous requests queues was got. The QoS service of IEEE-1394b was evaluated in IEEE-1394b fiber optical bus experimental system in the end. The theoretic derived results were verified. It has a directive meaning in QoS design of IEEE-1394b driver layer.
Keywords�� network protocols   quality of service   avionics     
Received 2007-04-19;
About author: �ξ�Զ(1979��),��,ɽ��̫ԭ��,��ʿ��,jyduan@aspe.buaa.edu.cn.
�ξ�Զ, �Ŵ���, ʷ����.IEEE-1394b��������ϵͳ��QoS����[J]  �������պ����ѧѧ��, 2008,V34(04): 396-399
Duan Jingyuan, Zhang Chunxi, Shi Jieqin .QoS analysis on IEEE- 1394b fiber optical bus system[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(04): 396-399
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2008/V34/I04/396
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