RS8234 Mindspeed Technologies, RS8234 Datasheet - Page 228

• Manufacturer Part Number: RS8234
• Description: Atm Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

7.0 OAM Functions
7.4 PM Processing
7.4.4 Error Conditions During PM Processing
7.4.5 PASS_OAM Function
7-14
7.4.3.4 Turnaround and
Backward Reporting PM
Backward Reporting PM
Backward Reporting PM
Forward Monitoring PM
7.4.3.2 Reassembly of
7.4.3.3 Reassembly of
7.4.3.5 Turnaround of
Segmentation of
Cells ONLY
Cells
Cells
Cells
When the RS8234 receives a forward monitoring PM cell, the RSM coprocessor
reads the RSM_PM table word pointed to by the PM_INDEX field in the RSM
VCC Table entry. The location of the RSM_PM Table is above the LECID Table.
The BIPV, TRCC0, and TRCC0+1 fields are written to a special RSM-PM
forward monitoring status queue entry. The TUC0 and TUC0+1 fields can be
extracted directly from the RSM_PM cell payload.
OAM buffer queue if RSM_CTRL1(OAM_QU_EN) is a logic high. Otherwise, it
uses the BFR0 pool identification number in the RSM VCC Table to point to the
appropriate free buffer queue.
RSM_CTRL1(OAM_QU_EN) bit is a logic high. Otherwise, it uses the STAT
field in the RSM VCC Table to determine which status queue to use for that
channel.
Backward reporting cells are reassembled in the same manner as non-PM OAM
cells.
For each forward monitoring cell received, the RS8234 also writes the BIPV,
TRCC0, TRCC0+1, TUC0, and TUC0+1 fields to the RS_Queue, for further
processing by the segmentation coprocessor. The segmentation coprocessor
generates a backward reporting cell.
To enable turnaround of backward reporting PM cells without generation of
forward monitoring PM cells, set the segmentation PM_EN bit in the SEG VCC
Table entry to a logic high, set the PM_INDEX, and set the FWD_MON field to
zero.
If OAM cells are not using the global reassembly OAM buffer pool, then the cells
are treated as Single Segment Messages (SSMs) for purposes of the firewall
protection. OAM cells using the global OAM buffer pool do not have per channel
protection.
RS_QUEUE_FULL status indication will be set.
A PASS_OAM only function is activated by setting bit 22 of word 0 in the RSM
VCC table. When active, OAM cells are processed, and data cells are discarded
without incrementing any discard counters.
When a new buffer is needed, the reassembly coprocessor uses the global
A RSM status entry is written for each OAM cell reassembled.
The reassembly coprocessor uses the global OAM status queue if the
If the RS_Queue fills, the PM-OAM information will be dropped, and the
Mindspeed Technologies
ATM ServiceSAR Plus with xBR Traffic Management
™
28234-DSH-001-B
RS8234