Multiplex communications – Wide area network – Packet switching
Patent
1989-03-29
1990-04-03
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370124, 455606, 455607, 455612, 455617, H04B 900
Patent
active
049146483
ABSTRACT:
The present invention relates to a multichannel multihop lightwave communication network which allows packet concurrency in the network while avoiding the need for agile optical devices. The network comprises a lightwave communication medium (10) for supporting a plurality of independent user nodes; and a plurality of N network interface units (NIUs) (11). Each NIU is connected to the lightwave medium and one or more separate user nodes and comprises a trnasmitter section (28-35) and a receiver section (20-27) which are each fixedly assigned to transmit and receive, respectively, over a single channel or a plurality of separate channels to or from other NIUs of the network. In a connectivity pattern for one embodiment of the network, the NIUs are divided into k groups of p.sup.k NIUs such that each NIU of a first group of p.sup.k NIUs is capable of transmitting over the fixedly assigned single channel, or any or all of the p separate channels, to a preferred one or all of the associated p separate NIUs of a second group, etc. based on a generalization of a perfect shuffle pattern. Such technique permits all NIUs of the network to communicate with all other NIUs either via a single hop or via multiple hops where NIUs in subsequent groups of p.sup.k NIUs act as intermediate retransmission units.
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Acampora Anthony
Hluchyj Michael G.
Karol Mark J.
American Telephone and Telegraph Company
AT&T Bell Laboratories
Beek L. Van
Griffin Robert L.
Pfeifle Erwin W.
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