Information communication method and apparatus

Multiplex communications – Diagnostic testing – Determination of communication parameters

Reexamination Certificate

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C370S257000, C370S468000

Reexamination Certificate

active

09650351

ABSTRACT:
To minimize the bandwidth (or overhead) of isochronous data transfer in the IEEE 1394 standard and to minimize the signal-less periods (gaps) in asynchronous data transfer, and thereby achieve effective utilization of system resources, the IEEE 1394 interface of a transmitting node acquires the node ID of the root node in the system. Since the actual number of hops is equal to the root node_ID, the arbitration time and the propagation time are calculated based upon the actual number of hops, and from which the bandwidth for isochronous data transfer is determined. Hence, the bandwidth is allocated by the isochronous resource manager node, using the root node_ID to represent the actual number of hops. Gaps for asynchronous data transfer likewise are determined as a function of the actual number of hops that are present in the system, rather than the theoretical maximum number of hops. Thus, the size of the gaps may be reduced.

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IEEE Standards Board: “IEEE Standard for High Performance Serial Bus” IEEE Computer Society IEEE STD 1394-1995, 'Online! 1996, pp. 293-298, XP002274354 NY, USA Retrieved from the Internet: <URL:www.ieeeexplore.ieee.org/xpl/standards.jsp>'retrieved on Mar. 25, 2004 !.

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