RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
Figure 35 Receive Cell Processing for Fast SN
Wait for a cell in the
receive UTOPIA FIFO.
No
No
Check CRC-10 and place
cell in OAM queue.
Is the cell a
data cell?
Yes
Correct SN/SNP as specified
in ITU-T Recommendation
I.363.1
Is SNP
correct?
Able to correct
Unable to correct
Accept/drop cell as specified
in ITU-T Recommendation
I.363.1 “Fast SN Algorithm”
No
Drop
Is SN
correct?
Yes
Accept
Place data and signaling in
appropriate timeslots and
update write pointers.
9.2.2.2.4 Robust Sequence Number processing State Machine
The Robust SN processing State Machine is the same as the Fast SN
processing state machine except that all actions are taken on the previous cell
versus the current new cell. Robust Sequence Number processing is only
supported in the UDF-ML and UDF-HS modes with full cells.
The RALP robust sequence number processing state machine begins in the
START state. While in the START state two possibilities can occur:
1. If a cell is received with a valid SN, the OUT_OF_SYNC state is entered and
the cell is stored.
2. If a cell is received with an invalid SN, the cell is dropped and the START
state is maintained
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL
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