S/UNI®-ATLAS-3200 Telecom Standard Product Data Sheet
Preliminary
Name
Description
Fwd Total Lost
The Total Lost CLP0 cell count represents the total number of lost CLP0 user data
cells during a PM session. This count is not dependent on a threshold. That is, the
Total Lost CLP0 cell count is always incremented by the number of lost CLP0 user
cells.
CLP0 (16)
Bwd Total Lost
CLP0 (16)
Transmitted
The Transmitted CLP0+1 User Cell count represents the number of user cells that
CLP0+1 User Cells are originated on a monitored connection by the transmitting end point.
(32)
If the PM session is configured to source Fwd PM cells, then this count is derived
from the number of user cells transmitted.
If the PM session is configured to monitor or terminate PM flows, then this count is
derived from the difference of the TUC 0+1 fields of successive Backward Reporting
cells.
Transmitted CLP0
User Cells (32)
The Transmitted CLP0+1 User Cell count represents the number of CLP0 user cells
that are originated on a monitored connection by the transmitting end point.
If the PM session is configured to source Fwd PM cells, then this count is derived
from the number of CLP0 user cells transmitted.
If the PM session is configured to monitor or terminate PM flows, then this count is
derived from the difference of the TUC0 fields of successive Backward Reporting
cells.
Bwd Lost Bwd PM
Cells (8)
If the MCSN of a received BwdPM cell is out of sequence, then this count will be
incremented by the difference between the expected MCSN and the received
MCSN.
Bwd Lost Fwd PM
Cells (8)
The Bwd Lost Fwd PM Cells count represents the number of forward monitoring
cells lost in transit to the far end point. This calculation is performed based on the
Fwd MCSN field of arriving Backwards Reporting cells. Whenever the FMCSN field
of the Bwd PM cell is out of sequence, this count is incremented by the difference
between the received and expected MCSN. However, if the Bwd PM cell’s own
MCSN is also out of sequence, this count will increment by the number of apparently
lost Fwd PM cells minus the number of lost Bwd PM cells.
PM Cell Format as defined by ITU-T I.610
Header Fields
5x8
OAM Cell Type OAM Function
Performance
Management
Function
Reserved
6
EDC
(= 0010)
4
Type
4
(CRC-10)
10
Specific Fields
45x8
The Performance Management Function Specific Fields are listed below:
Fwd = Forward Monitoring PM cell field
Bwd = Backward Reporting PM cell field
Fwd + Fwd + Bwd Fwd
Bwd
Fwd +
Bwd
Fwd
Bwd
Bwd
Bwd
Bwd
Bwd
MCSN TUC_0+1 BEDC_0+1 TUC_0
(8) (16) (16) (16)
Time
Unused Fwd
SECBC TRCC_0 Block TRCC_0+1
Stamp 6AH
MCSN (8)
(8)
(16)
Error
Result
(8)
(16)
(32)
(27
octets)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990553, Issue 4
128
PMC [ PMC-SIERRA, INC ]
