Multiplex communications – Wide area network – Packet switching
Patent
1994-06-08
1995-05-30
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
375357, 375358, H04L 710
Patent
active
054208653
ABSTRACT:
A frame alignment method and system for communicating frames of information between at least two devices. A `start of alignment sequence` is used to cause a device that is in the misaligned state to inform the other device of this state condition in such a way that the other device itself is caused to transition to the misaligned state. The `start of alignment sequence` is therefore a frame alignment error when a device is in the aligned state. Each device in the misaligned state repetitively transmits the `start of alignment sequence`. Each device in the misaligned state transitions to the realignment state upon detection of the `start of alignment sequence`. When in the realignment state the device transmits the `end of alignment sequence` to cause the other device to transition to the aligned state if the other device is in the realignment state. Devices in the aligned state transmit any pending frames of information and remain in this aligned state until a frame alignment error, including a `start of alignment sequence`, is detected. A system for implementing this frame alignment method is also described.
REFERENCES:
patent: 4592051 (1986-05-01), Frizlen
patent: 4606023 (1986-08-01), Dragoo
patent: 5110558 (1978-08-01), Kageyama et al.
patent: 5291529 (1994-03-01), Crook et al.
International Standard ISO/IEC 4335 "Information Technology-Telecommunications and Information Exchange Between Systems" Ref. No. ISO/IEC 4335:1993(E) Fifth Edition.
International Standard ISO/IEC 3309 "Information Technology-Telecommunications and Information Exchange Between Systems" Ref. No. ISO/IEC 3309:1993 (E).
"Data and Computer Communications" by William Stallings, Ph.D. Second Edition, pp. 148-152 from Data Link Control.
Alcatel Data Networks
Safourek Benedict V.
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