Multiplex communications – Wide area network – Packet switching
Patent
1994-07-21
1996-06-11
Hsu, Alpus H.
Multiplex communications
Wide area network
Packet switching
370 26, 370 30, 370 50, 370 75, 375213, 375214, H04J 116
Patent
active
055263437
ABSTRACT:
A transmission system for an auxiliary signal which is extracted from/inserted into a terminal office and for an IF repeater office for digital multiplexing microwave communications. The auxiliary signal transmission system multiplexes the frequencies of primary signals, and performs a communications operation between a terminal office pair and repeater offices that are located between the pair of terminal offices for extraction/insertion of auxiliary signals. In this system, the frequencies of the auxiliary signals are provided in the vacant areas in the frequency bands of the primary signals, and the auxiliary signals are transmitted from the repeater offices in a time-sharing manner.
REFERENCES:
patent: 2666845 (1951-11-01), Colton et al.
patent: 4101738 (1978-07-01), Bellanser et al.
patent: 4197496 (1980-03-01), Hiyama
Aizawa Shigemi
Kawasaki Toshio
Fujitsu Limited
Hsu Alpus H.
Ngo Ricky
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