Multiplex communications – Wide area network – Packet switching
Patent
1977-10-04
1980-05-27
Stewart, David L.
Multiplex communications
Wide area network
Packet switching
370 91, 370118, H04J 316
Patent
active
042052009
ABSTRACT:
A digital communication system employs a technique of effectively controlling the size of the bytes making up a field of data to be serially transmitted from one station to another, particularly one wherein the byte size may be selectively changed during the transmission of the data field. Assembly of a transmitted data field is controlled so that it includes an encoded data byte, termed a first pre-header byte, which contains information as to whether or not a change in the byte size of the data field is to occur. If the first pre-header byte indicates the occurrence of a byte size change, it also will contain a code representative of the size of the change. In addition, for a change in byte size, a second encoded data byte, termed a second pre-header or count byte is generated and immediately follows the first pre-header byte. The count byte contains information which specifies the length of that portion of the data field which precedes the occurrence of the change in byte size. Thereafter, following these pre-header bytes are a number of bytes of a first byte length (usually eight bits), which number is designated by the count byte, succeeded by those data bytes whose size is that specified in the first pre-header byte.
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Dharia Prabodh M.
Kurtz John J.
Parikh Bipin D.
Patel Bhagubhai K.
Patnaik Haresh C.
Cavender J. T.
Dugas Edward
Jewett Stephen F.
NCR Corporation
Stewart David L.
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