VSC6134
Datasheet
PM Backward Error Indication (BEI)
The PM BEI monitor accumulates the BEI value in a 24-bit counter. Every second the BEI error count
transfers to a cache register OTUk_PM_BEICNT[23:0] for microprocessor read access. Depending on
the microprocessor configuration bit SAT_ROLLOVERN, the accumulator either clears
(SAT_ROLLOVERN = 1) or retains its value (SAT_ROLLOVERN = 0) after the count transfers.
OTUk_PM_BDIL, when set, pauses BEI accumulation. Any one of the following conditions also pauses
BEI accumulation:
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OOF when OTUk_OOFCNT_CTRL = 1
LOF
LOS
PM OCI
PM LCK
PM AIS
BEI values of 1 through 8 set the status bit OTUk_PM_BEIS. The status bit and its respective mask bit
OTUk_PM_BEIM create a maskable interrupt.
PM Status (STAT)
The PM STAT field monitor updates the stored STAT field after debouncing the received STAT field
over three consecutive frames. The live bit OTUk_PM_STATL indicates if the stored STAT field is valid
(1) or invalid (0). Any change in the live bit sets the status bit OTUk_PM_STATS and, together with its
mask bit OTUk_PM_STATM, creates a maskable hardware interrupt.
The PM STAT field monitor stores the decoded alarms as status and live bits: OTUk_PM_AISS,
OTUk_PM_OCIS, OTUk_PM_LCKS, OTUk_PM_AISL, OTUk_PM_OCIL, and OTUk_PM_LCKL.
The mask bits (OTUk_PM_AISM, OTUk_PM_OCIM, OTUk_PM_LCKM) with the respective status
bits create a maskable interrupt. Debouncing means that a received STAT field is valid only if the PM
STAT field finds identical STAT field values over three consecutive OTUk frames.
The STAT field decoding is as follows:
Table 53. PM STAT Field Decoding
STAT Value
0x0
Status Bit
Description
Reserved for future standardization
Normal path signal
0x1
0x2
Reserved for future standardization
Reserved for future standardization
Reserved for future standardization
Maintenance signal: ODUk-LCK (locked)
Maintenance signal: ODUk-OCI (open connection indication)
Maintenance signal: ODUk-AIS (alarm indicator signal)
0x3
0x4
0x5
OTUk_PM_LCKS
OTUk_PM_OCIS
OTUk_PM_AISS
0x6
0x7
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VMDS-10185 Revision 4.0
July 2006
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
