Method and apparatus for establishing frame synchronization

Details Method and apparatus for establishing frame synchronization Method and apparatus for establishing frame synchronization

H - Electricity

04

J

363/17

H04J 3/06 (2006.01) H04L 7/10 (2006.01)

Patent

CA 1184325

METHOD AND APPARATUS FOR ESTABLISHING FRAME SYNCHRONIZATION Abstract A synchronization technique in which the frame used for synchronization is different from that used for normal data communication and contains few if any bits other than those used to establish synchronization. At the beginning of data communication, the synchronization frame is stored in one of a pair of memories and this frame is read out of the memory onto a communication channel between the local and remote stations. At the same time, the other memory is used to store the frame that is normally used for data communication. When synchronization is established between the local and remote stations, signal generation shifts from the first memory to the second; and the second memory immediately begins to produce the channel select and overhead signals needed for data communication. Illustratively, the synchronization frame contains less than one hundred bits and in a preferred embodiment a total of forty-eight bits are used for synchronization. As a result, synchroni- zation can be achieved much more quickly than in systems where three full data frames must be transmitted to achieve synchronization. Moreover, since few, if any, of the bits present in the synchronization frame are customer- originated data bits or EIA-type control signals, false synchronization problems are avoided.

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