Appeal No. 98-3047
Application No. 08/576,539
cell contains the proper OAM and function type fields to yield a match, then table accessing unit 616
allows access to VP Table-2 623.
The VP Table-2 contains a data record including failure state 618, state management timer
619, monitor/drop bit 620, and failure information 621. The structure of VP Table-2 is shown in Fig.
5B, with Virtual Path information corresponding to each Virtual Path Identifier address 617 (Fig. 4).
The following section of Miyagi explains the operation of state transition decision unit 624,
which acts on VP Table-2:
Of the contents of the VP table-2 623, the failure state 618 and the timer 619
correspond to the state and the VP-AIS cell non-reception timer shown in FIG. 8 and
they are supplied to a state transition decision unit 624 and values updated in
accordance with the state transition diagram of FIG. 8 are written onto the VP table
623. When the state is changed to the failure state or the failure state is recovered to
the normal state by the decision of the state transition decision unit 624 and the
notification to the host processor is required, the failure notification signal is supplied to
the table accessing unit 616 by a signal S9 and it is notified to an MPU interface 601
through the table accessing unit 616 and to the host processor through the signal line
631.
Miyagi, column 6, lines 30-42.
Miyagi's Figure 4, a portion of which is reproduced below, illustrates the action of the decision
unit on VP Table-2.
=ãäÅ\õãåõãÅãæå\ãâåõ\õãáÅ\\ãüÅõ\ãæ \ãÆæõ\õãæÅõõãÅ\ãù~ã=Äõ\õ\ãw\ãõãäåååãææõ\ãäãàåãåÆ
\õõãÆãå
- 5 -
Page: Previous 1 2 3 4 5 6 7 8 9 10 Next
Last modified: November 3, 2007