Multiplex channels for continuous flow for numerical signal

Multiplex communications – Wide area network – Packet switching

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370 94, 358147, H04J 306

Patent

active

046882189

ABSTRACT:
A digital data pack transmission system is especially--but not exclusiveluseful in videotex or teletext transmission (i.e. videotext or teletext data is transmitted during intervals between segments of video signals). The inventive system uses a continuous transmission carrier. A plurality of data packs are individually included in each block of data which is periodically transmitted. Dummy packs are used to fill the blocks, if less than a full complement of packs is required. The time periods available for the transmission of blocks of data are exactly equal to or a little longer than the maximum length of the transmitted blocks. The beginning of each data block has a synchronization bit pattern which is constituted by a "bit sync" byte followed by a "byte sync" byte. Except for the synchronizing pattern, the signals are scrambled before transmission and descrambled upon receipt and recognization of the data.

REFERENCES:
patent: 4058830 (1977-11-01), Guinet et al.
patent: 4205343 (1980-05-01), Barrett
patent: 4337483 (1982-06-01), Guillou
patent: 4414662 (1983-11-01), Bousquet
patent: 4420833 (1983-12-01), Noirel

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