Multiplex communications – Wide area network – Packet switching
Patent
1991-10-17
1993-12-07
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
364717, H04L 1240
Patent
active
052688992
ABSTRACT:
A pseudo-random number generator for a communications network, such as a CSMA/CD network, is based on a circuit which supplies a pseudo-random signal which normally changes according to a first algorithm, and changes according to a second algorithm during intervals having duty cycle behavior known to vary from node to node, such as transmission times of the node. Because it is very unlikely that two nodes in a given network will have transmission times that are equal, it is unlikely that pseudo-random number generators responsive to the local transmission times will proceed in lock-step. The pseudo-random number generator comprises, for instance, a counter which runs at a first clock rate normally, and runs at a second clock rate during intervals having lengths determined by the transmission times of the node.
REFERENCES:
patent: 4536875 (1985-08-01), Kume et al.
patent: 4598285 (1986-07-01), Hoshen
patent: 4641102 (1987-02-01), Coulthart et al.
patent: 4644348 (1987-02-01), Gerety
patent: 5117380 (1992-05-01), Tanagawa
Local Area Networks, Intel Model 82586.
Network Interface Controller, National Semiconductor Model 8390.
3Com Corporation
Kizou Hassan
Olms Douglas W.
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