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CHAPTER 5 SAR FUNCTION
196
Table 5-6. Errors Which May Occur for All of the First, Intermediate, and Last Cells of the Packet
Error
Timing of cell discard
Timing of issue of receive
indication
Cells arriving after
occurrence of error
Free buffer underflow
Cells received when no free
buffer is available are
discarded.
When transfer becomes
impossible during the transfer
of a segment
Discarded up to the last
cell of the packet
Receive FIFO overrun
Cells received when the receive
FIFO is full are discarded.
When the last cell of the same
packet arrives after a cell is
discarded
Discarded up to the last
cell of the packet
"MAX. NUMBER OF
SEGMENTS" error
Cells from the cell next to that
at which "MAX. NUMBER OF
SEGMENTS" is reached to the
last cell are discarded.
When the cell next to that at
which "MAX. NUMBER OF
SEGMENTS" is reached arrives
Discarded up to the last
cell of the packet
T1 error
Cells which arrived after time
T1 elapses are discarded.
When time T1 elapses
Discarded up to the last
cell of the packet
Deactivate_Channel
Cells which arrived after the
Deactivate_Channel command
is executed, are discarded.
When execution of the
command is completed
All cells which arrive in
the VC are discarded.
Errors of different types may occur simultaneously, but only a single error is reported by a receive
indication. The following table indicates the error which takes precedence, for every possible
combination of errors which may occur simultaneously.
Table 5-7. Error Which Takes Precedence upon Occurrence of Multiple Errors
Underflow
Overrun
MAX. error
CRC error
Abort
Length
T1 error
Underflow
-
-
Underflow
Underflow
Underflow
Underflow
Underflow
Overrun
-
-
Overrun
Overrun
Overrun
Overrun
Overrun
MAX. error
-
-
-
MAX. error
MAX. error
MAX. error
MAX. error
CRC error
-
-
-
-
CRC error
CRC error
CRC error
Abort
-
-
-
-
-
-
Abort
Length
-
-
-
-
-
-
Length
T1 error
-
-
-
-
-
-
-