Appeal No. 1998-0747
Application 08/609,958
Appellants’ Invention
Referring to Figure 1, components 20a and 20b, which may be
modems, are connected between relay switches 30 and 35. Each
component includes an operational element 31, an EPROM 22, a RAM
23
and a summary failure indicator 24, all of which are controlled by
a microprocessor 21. A microprocessor determines whether the
component is to serve as a spare component or an operating
component. If a failure occurs in an operating component such as
20a, the
microprocessor 21b detects a failure signal from the summary
failure indicator 24a. The microprocessor 21b then transmits a
switch control signal to cause relay switches 30 and 35 to
disconnect component 20a from the input and output lines, and
connect component 20b to these lines. The microprocessor 21b then
enters into an operating mode by executing instructions stored in
the EPROM 22b.
The Prior Art
3
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