Synchronous network device

Pulse or digital communications – Synchronizers – Network synchronizing more than two stations

Reexamination Certificate

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Reexamination Certificate

active

08005178

ABSTRACT:
A physical layer device comprises a first port that embeds a first clock into data transmitted over a first physical medium; a second port that embeds a second clock into data transmitted over a second physical medium; a first selection module that outputs the first clock to the first port based on one of a locally generated clock and a recovered clock; and a second selection module that outputs the second clock to the second port based on one of the locally generated clock and the recovered clock. A method comprises embedding a first clock into data transmitted over a first physical medium; embedding a second clock into data transmitted over a second physical medium; generating the first clock based on one of a locally generated clock and a recovered clock; and generating the second clock based on one of the locally generated clock and the recovered clock.

REFERENCES:
patent: 2002/0186716 (2002-12-01), Eidson
patent: 2003/0165115 (2003-09-01), Sutoh et al.
patent: 2008/0219391 (2008-09-01), Moubarak
patent: 2009/0016475 (2009-01-01), Rischar et al.
patent: WO 00/59161 (2000-10-01), None
patent: WO-0059161 (2000-10-01), None
ZL30120 Sonet/SDH/Ethernet Multi-Rate Line Card Synchronizer; Data Sheet; Zarlink Semiconductor; May, 2006; 27 pages.
ZLAN-211 Synchronizing Ethernet Networks Using Layer 1 clocks with the ZL30120; Application Note; Zarlink Semiconductor; Jan. 2007; 2 pages.
IEEE P802.1AS/D2.0; Draft Standard for Local and Metropolitan Area Networks—Timing and Synchronization for Time-Sensitive Applications in Bridged Local Area Networks; Sponsor LAN/MAN Standards Committee of the IEEE Computer Society; Prepared by the Interworking Task Group of IEEE 802.1; 204 pages; Feb. 22, 2008; IEEE 802.1AS—Timing and Synchronization; pp. 1-6.
International Standard IEC 61588(E):2004; First Edition 2004-09; IEEE 1588(E)TM 2002; Precision Clock Synchronization Protocol for Network Measurement and Control Systems; Sponsor TC9—Technical Committee on Sensor Technology of the IEEE Instrumentation and Measurement Society; Approved Sep. 12, 2002; IEEE-SA Standards Board;,158 pages.
IEEE Std 802.3TM-2002 (Revision of IEEE std 802.3, 2000 Edition); IEEE Standard for Information technology— Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements; Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications; IEEE Computer Society; Sponsored by the LAN/MAN Standards Committee; Mar. 8, 2002; 576 pp.; Section Two: This section includes Clauses 21 through 33 and Annexes 22A through 32A; pp. 1-582; Section Three: This section includes Clauses 34 through 43 and Annexes 36A through 43C; pp. 1-379.
IEEE Std 802.Mar. 2002® (Revision of IEEE Std 802.3®, 2000 Edition); IEEE Standard for Information technology—Telecommunications and information exchange betwwn systems—Local and metropolitan area networks—Specific requirements; Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications; IEEE Computer Society; Sponsored by the LAN/MAN Standards Committee; Mar. 8, 2002; 104 pages.
IEEE Std 802.3—2005 Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications—Section Three vol. Section 3, 2005, pp. 1-387, XP002489647 ISBN: 0/7381-4740-0.
Notification of Transmittal of The International Search Report and The Written Opinion of The International Searching Authority, or The Declaration dated Aug. 7, 2008 in reference to PCT/US2008/003648.

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