Multiplex communications – Wide area network – Packet switching
Patent
1995-02-07
1996-07-09
Marcelo, Melvin
Multiplex communications
Wide area network
Packet switching
370 82, 348 12, 455 51, H04L 522
Patent
active
055352065
ABSTRACT:
A cable television upstream data transmission system provides a plurality of time slots synchronized to the downstream symbol clock for use by subscriber terminals in upstream data transmission. The width and number of time slots are controlled by a pair of downloadable values to accommodate dynamic changes of the cable system. A transmission modulator used within the subscriber terminal produces an upstream transmission carrier having a frequency locked to the symbol clock. The frequency of the carrier signal produced by the transmission modulator is programmably controlled by a plurality of program values which are selected to provide frequency and phase lock of the modulator's carrier to the symbol clock.
REFERENCES:
patent: 4528663 (1985-07-01), Citta
patent: 4553161 (1985-11-01), Citta
patent: 4860283 (1989-08-01), Takano et al.
patent: 5127002 (1992-06-01), Shaik et al.
Bestler Caitlin B.
Rabii Khosro M.
Kail Jack
Marcelo Melvin
Zenith Electronics Corporation
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