Multiplex communications – Network configuration determination – In a bus system
Patent
1996-12-09
1999-09-28
Marcelo, Melvin
Multiplex communications
Network configuration determination
In a bus system
370402, H04L 1246
Patent
active
059599766
ABSTRACT:
The present invention relates to a method and device for filtering transmission addresses in Ethernet, more particularly, to a filtering method and device provided to reduce the network loads of different groups in Ethernet. The present invention solves the problems that a large amount of memory space is required and a packet can not be filtered effectively since the the memory contents are lost when power fails in the filtering method of the prior art. The filtering method of the present invention is only to store the flag of the corresponding source address rather than the entire address data. The work for data comparing only reads out the state of the flag of the corresponding address, then refers to the differences between the state of the "0" and "1" of the flag to determine whether the packet should be blocked or allowed to is pass. The memory space will be very small due to only storing the state of the flag. The present invention is further equipped with a programmable timer such that the address data can be just stored into a memory rather than proceeding a comparison and filter in a specific time or every other time interval after power is abruptly disconnected or fails.
REFERENCES:
patent: 5396493 (1995-03-01), Sugiyama
patent: 5473607 (1995-12-01), Hausman et al.
patent: 5633858 (1997-05-01), Chang et al.
patent: 5640399 (1997-06-01), Rostoker et al.
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