Multiplex communications – Wide area network – Packet switching
Patent
1981-01-12
1984-05-22
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
375109, 375114, H04J 306
Patent
active
044505582
ABSTRACT:
A synchronization technique in which the frame used for synchronization is different from that used for normal data communiction 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, synchronization 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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Hampton Dean A.
Jacobsen Christian C.
Profet Gary A.
Chin Stephen
General DataComm Industries Inc.
Griffin Robert L.
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