PXB4340E Datasheet, PDF (28/185 Pages) Infineon Technologies AG – ICs for Communications

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F4/F5 processing (see VHFWLRQ  page 98, VHFWLRQ  page 110, for DISF5 in up-
and downstream direction; VHFWLRQ  page 105, VHFWLRQ  page 116, for DISF4 in
up- and downstream direction). Otherwise all F4/F5 cells are discarded at the receiving point.
The PXB 4340 AOP automatically inserts VP-AIS cells for VPCs and VC-AIS cells for VCCs.
)LJXUH  shows that this case occurs at the incoming port of a switch.
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The generated VC-AIS cells travel up to the endpoint of the connection, which normally is the
user terminal. Thus within a very short time delay - determined by the control processor’s
response time, the PXB 4340 AOP insertion delay and the cell transfer time - the user is
informed about the failure.
The generated VP-AIS cells travel up to the VP terminating endpoint which normally is within the
network. At the VP terminating endpoint - which is always at the incoming port of a switch - VC-
AIS cells must be generated for all VCCs contained in the VPC. Again, all affected user terminals
are informed.
The PXB 4340 AOP automatically performs the following actions when receiving VP-AIS cells
at a VP terminating endpoint (see ILJXUH ):
Data Sheet
2-28
04.2000