Method and apparatus for fiber autonegotiation

Multiplex communications – Channel assignment techniques – Carrier sense multiple access

Reexamination Certificate

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C370S463000

Reexamination Certificate

active

10364602

ABSTRACT:
A first network device includes a first physical layer device with a first autonegotiation circuit. A bypass timer determines a predetermined period. A second network device includes a second physical layer device. The first network device enables autonegotiation bypass and establishes a link with the second network device after the predetermined period during which a link between the first and second network devices is not up, a receiver of the first physical layer device is in sync, and an ability detect state of the first autonegotiation circuit is true. The first autonegotiation circuit resets the predetermined period of the bypass timer when configuration code groups are received from the second network device. When the first network device receives idle code groups followed by data code groups, the first autonegotiation circuit does not return to an autonegotiation enable state.

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(Revision of IEEE Std. 802.3, 2000 Edition); 802.3 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; Mar. 8, 2002.

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