Electrical computers and digital processing systems: multicomput – Computer network managing – Computer network monitoring
Reexamination Certificate
2006-10-17
2006-10-17
Kang, Paul H. (Department: 2141)
Electrical computers and digital processing systems: multicomput
Computer network managing
Computer network monitoring
C709S226000
Reexamination Certificate
active
07124182
ABSTRACT:
The present invention preferably places a hardware circuit between the SCU's ARCNET transceiver and the backplane bus rather than a parallel snooper circuit. This circuit builds the map based on the tokens it observes. When the circuit detects the token for the SCU, it blocks the token transmission to the SCU's ARCNET transceiver. It then sends a minimum length “ping” message to each unit that was present on the bus during the last token rotation, but is not present during the token rotation that just ended. Since units that have lost their token can still respond to a Free Buffer Enquiry message, the circuit can use it as a ping to verify whether the missing unit(s) are actually missing or have just lost their token due to noise. After verification, the token is forwarded to the SCU's ARCNET transceiver.
REFERENCES:
patent: 5335221 (1994-08-01), Snowbarger et al.
patent: 5862338 (1999-01-01), Walker et al.
Gorshe Steven Scott
Parker Aaron Jeffrey
Kang Paul H.
NEC Eluminant Technologies, Inc.
Scully , Scott, Murphy & Presser, P.C.
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