Appeal No. 97-2763
Application No. 08/580,790
optical network (SONET) test frames (Figure 3) to conduct a
test on a transmission line in a broadband ISDN (column 2,
lines 1 through 5; col. 3, lines 43-64). In an on-line test
in the broadband ISDN (Figure 4), a central conditioning (CC)
unit 12 issues a command to test data inserter 13 to send test
cell data (e.g., the test cell of Figure 2) through ATM switch
11 and through the transmission line to either ATM layer 14 or
to the subscriber terminal adapters 17a and 17b where the test
cell is turned around and sent back through the transmission
line to the test data checker 18 (column 4, lines 6 through
41). In an off-line test of the broadband ISDN, the test cell
data is sent via the ATM switch 11 and the transmission line
to either the terminator 16 or the network terminator (NT) 15
where the test cell is turned around and sent back through the
transmission line to the test data checker 18 (column 4, lines
48 through 57). The test cell checker 18 compares a turned
around test cell with the test cell sent through the
transmission line, and notifies the CC 12 of the results of
the transmission line test (column 5, lines 29 through 39).
We agree with appellants’ argument (Brief, pages 15 and
16) that Izawa only discloses the transmission of test cell
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Last modified: November 3, 2007