Method and apparatus for byte and frame synchronization on a loo

Details Method and apparatus for byte and frame synchronization on a loo Method and apparatus for byte and frame synchronization on a loo

1976-08-11

1977-08-16

Robinson, Thomas A.

Telegraphy

Systems

Printing

178 691, H04J 308, H04L 708

Patent

active

040427838

ABSTRACT:
A method and apparatus for synchronizing frame delimited bit stream messages on a high speed loop for communication among storage system elements. The method especially minimizes the time for attaining frame and byte synchronization among terminals attaching storage elements to the loop. The method comprises the steps of (1) synchronizing terminals downstream from a faulty terminal to a first synch reference as generated by the faulty terminal and further (2) synching the terminals upstream therefrom to a second synch pattern generated by the primary terminal responsive to the first reference. As a consequence, the system resynchs as a function of resynching of the faulty station alone. Transmission efficiency is improved by logically assigning for loop attachment only those loop secondary terminals whose storage elements have an aggregate bandwidth less than the available instantaneous loop bandwidth. Further improvement is obtained by dynamically varying the frame assignments. Finally, efficiency is achieved by minimizing the time to acquire and reacquire byte and frame synchrony loss caused when the loop is initially powered on or by transient electrical disturbances.

REFERENCES:
patent: 3906153 (1975-09-01), Sawtschenko
patent: 3919483 (1975-11-01), Gindierae
patent: 3919484 (1975-11-01), Maxemchuk
patent: 3967060 (1976-06-01), Subramainian

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