Multiplex communications – Wide area network – Packet switching
Patent
1989-01-18
1989-12-19
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 851, 370 953, H04B 7185
Patent
active
048887692
ABSTRACT:
A TDMA terminal is disclosed having a plurality of terrestrial interface ports, and a plurality of modems for modulating preamble and port data onto a carrier and demodulating the received data transmitted via a satellite from the carrier wherein the interface ports and modems are fully connected over a common bus arrangement. The TDMA terminal controller defines the sequence of transmission (TX) and reception (RX) of information through these multiple ports and modems. The control sequencing selectively activates the ports and modems to accommodate current traffic requirements. This is achieved by presenting clock timing signals and port address signals repetitively to the ports during each transmission frame to couple the ports to the bus for transmit and receive information during the allocated burst intervals. This sequencing system adds or deletes bursts, for selectively defining the ports and modems to be coupled to the bus. clock intervals ("phases") are added to or deleted from the addressing sequence to modify the timing of the transmission frame; in this way the frame is centered relative to the transmission and receive aperture, in order that terminal the remains fully synchronized with the transmission of information.
REFERENCES:
patent: 3879580 (1975-04-01), Schlosser et al.
patent: 4312063 (1982-01-01), Warner
patent: 4355388 (1982-10-01), Deal, Jr.
patent: 4581736 (1986-04-01), Dobyns et al.
patent: 4630263 (1986-12-01), Townsend et al.
Marcelo Melvin
Olms Douglas W.
TIW Systems, Inc.
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