Multiplex communications – Wide area network – Packet switching
Patent
1992-02-21
1994-05-10
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 55, 370 581, 34082503, H04J 308, H04J 314
Patent
active
053115015
ABSTRACT:
A routing system for a linear ADM having two drop switches, operates to establish paths according to a relatively simple process and to establish paths according to a program that is relatively small in scale and inexpensive to develop. The routing system includes a first selection switch for selecting one of a plurality of channels connected to a first transmission line and for outputting a first signal transmitted through the selected channel. A first selector selectively outputs and inhibits the first signal transmitted from the first selection switch. The first selection switch and the first selector are provided in one of the drop switches. A second selection switch selects one of a plurality of channels connected to a second transmission line and outputs a second signal transmitted through the selected channel. A second selector inhibits the second signal transmitted from the second selection switch when the first selector outputs the first signal, and outputs the second signal when the first selector inhibits the first signal. The second selection switch and the second selector are provided in the other of the drop switches. The first and second signals are selectively transmitted from the first and second selectors to a transmitter/receiver for lower signal levels.
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Fujitsu Limited
Hsu Alpus H.
Olms Douglas W.
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