PXB4340E Datasheet, PDF (41/185 Pages) Infineon Technologies AG – ICs for Communications

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Note that between Nodes ’a’ and ’b’ a number of intermediate nodes can be located. All
PXB 4340 AOP chips on these nodes must be configured either as Originating or Terminating
Segment Points (OSP, TSP) or as Intermediate Points (IP).
One of the 128 PM processors in the PXB 4340 AOP upstream part of Node a is configured in
generate mode, i.e. it monitors all user cells of VPC_a-b, computes PM data and inserts it after
blocks of user cells into the cell stream as Forward Monitoring (FM) cells.
At the terminating PXB 4340 AOP one of the 128 PM processors is configured in analyze mode,
i.e. it monitors all user cells of VPC_a-b, computes PM data and adds it to the PM data contained
in the FM cells. The FM cells are extracted from the cell stream, converted into Backward
Reporting (BR) cells and re-inserted in backward direction in VPC_b-a. The conversion into BR
cells includes the calculation of the differences between measured PM data and the PM data
contained in the FM cells. The differences are written into the BR cells.
Back at the originating Node a, the BR cells are discarded after evaluation.
Note that the re-insertion of BR cells in backward direction assumes the same identifier (LCI) of
the backward direction connection.
Data Sheet
2-41
04.2000