Apparatus and methods for providing an interface between FDDI-II

Details Apparatus and methods for providing an interface between FDDI-II Apparatus and methods for providing an interface between FDDI-II

1993-12-21

1995-08-08

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370108, 359119, 375371, H04L 708, H04L 1266, H04J 1402

Patent

active

054405572

ABSTRACT:
To exchange data in the same position in the hybrid ring control cycles in two FDDI-II rings, the cycles of the different rings are phase and frequency aligned. To achieve phase alignment, a hybrid multiplexer in one of the rings monitors the cycles on the other ring and starts a cycle when the hybrid multiplexer detects a starting delimiter on the other ring. In order to achieve frequency alignment, 8 KHz references produced by two hybrid multiplexers on the two respective rings are provided to a circuit that selects one of the references to determine the frequency for synchronizing cycle outputs of both hybrid multiplexers.

REFERENCES:
patent: 4677618 (1987-06-01), Haas et al.
patent: 4993026 (1991-02-01), Yamashita
patent: 5008904 (1991-04-01), Mangelsdorf et al.
patent: 5031174 (1991-07-01), Natsume
patent: 5245667 (1993-09-01), Lew
patent: 5297145 (1994-03-01), Havermans
A book entitled: FDDI Hybrid Ring Control (HRC), Working Draft Proposed American National Standard, American National Standards Institute ("ANSI"), May 28, 1992.
A book entitled: FDDI Physical Layer Protocol (PHY-2), Draft Proposed American National Standard, ANSI, Jun. 17, 1992.
A book entitled: FDDI Station Management-2 Isochronous Services (SMI-2-IS), Working Draft Proposed Anerican National Standard, ANSI, May 12, 1993.
U.S. Patent application Ser. No. 08/146,337, filed Nov. 1, 1993.
U.S. Patent application Ser. No. 07/969,910, filed Nov. 2, 1992.

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