PXB4340E Datasheet, PDF (132/185 Pages) Infineon Technologies AG – ICs for Communications

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The transmission of a LB cell is usually initiated by the system controller. The parameters
• LCI
• segment or end-to-end or intra-domain LB
• the Location identifier in case of intra-domain LB
must be given by the system controller. Note that in case of a segment or end-to-end LB the
location and source ID are set to all ones. The microprocessor assembles the LB cell and
transmits it via the AOP. A timer is started for time-out supervision.
Prior to transmission the LB State bit is set for this connection. This bit causes the returning LB
cell to be copied to the receive buffer. If it is not set the backward LB cell is discarded without
notice. By comparing the correlation tag the peripheral controller makes sure that the cell was
the one sent out before.
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The request to do performance monitoring over a given VPC or VCC connection or segment is
initiated by the system controller and sent to the originating point microprocessor. The
parameters
• LCI or LCI2 (for F4 PM)
• Block size (128, 256, 512, 1024)
must be given. Similar to the LB procedure the microprocessor generates an appropriate
activation cell for either segment or end-to-end, depending on the given configuration. After
reception of the confirmation cell (6HFWLRQ ) the FM generation processor is assigned as
well as a data collection processor in the opposite direction. There are two restrictions to be
checked:
• there are at most 128 processors for FM generation or analysis and 128 processors for data
collection
• not more than 2 processors can be invoked for one user cell, one for F4 and one for F5
(6HFWLRQ ).
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An activation/ deactivation cell may be received at any time at the receive buffer of the AOP. In
such a case the peripheral controller looks for a free PM processor and assigns it to the
connection. The PM processor is initialized in analyzing mode. Then a confirmation cell is sent
back to the originating port. The PM endpoint is now ready for reception of the first FM cell.
Data Sheet
4-132
04.2000