Importance

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Abstract

A data ring circulates a serial stream of data bits between ring stations. The data stream is made of packets and each station may add data to and extract data from the packets. As the number of data bits in the data stream and its length becomes longer than the electrical length of the data transmission line, it is necesssary to store the excess data bits which cannot be accommodated on the transmission line. Accordingly, a store is provided to store the excess data. When the transmission line is initially filled, the first data bit in the data stream will appear at the store. Any data phase transition is sensed and data is clocked into the store responsively. In this way, the insertion of data into the store is made responsive to the phase of the data and to the changing electrical length of the line, and the phase of the data at the store input. A clock provides an indication when all of the data has been placed on the line and responsive thereto, enables the reinsertion of data from the store to the line and contiguous with the last bit of the initially loaded data stream.

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First Claim