Appeal No. 1999-2380
Application No. 08/575,743 Page 12
are set to indicate that the node corresponding to the record
found is authorized to communicate dataframes to the network. If
the mode bits are not found, or do not indicate a source class,
the filter state machine will withhold the Copy command and the
dataframe, in essence, will be discarded.
From the disclosure of Futral, we find that both an address
(source or destination) and a corresponding mode control bit are
required in order for a message to be forwarded from one network
to another. Although the situations can arise when an address is
found but the address does not correspond with the mode control
bit, or the address is found but no mode bit is found, we find no
teaching or suggestion that a determination of uncertainty is
made, but rather simply that two required criteria for forwarding
the message have not been met. We find the examiner's assertion
(answer, page 5) that the system infers uncertainty to be
speculation, unsupported by evidence in the record. While the
system of Futral could be modified to make a determination of
uncertainty, we find no teaching or suggestion for making the
modification. Because the mode control bits are used to
differentiate between source and destination addresses, we find
that the only suggestion of making a determination of uncertainty
comes from appellants' disclosure.
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