S/UNI®-ATLAS-3200 Telecom Standard Product Data Sheet
Preliminary
Name
Fwd TUC_0 (16)
Description
Total CLP0 User Cells for Forward Monitoring PM Cells. TUC_0 indicates the
number modulo 65536 of CLP 0 user cells transmitted just before the transmission
of a Forward PM cell.
If this PM process is the source of Forward PM cells then this field stores the value
of TUC_0 inserted into the most recent generated Forward PM Cell, and is used
together with the Current Cell Count CLP0 to determine TUC_0 of the subsequent
generated PM cell. This is a running count and does not need to be initialized.
If this PM process terminates/monitors Forward PM cells, then this field stores the
value of TUC_0 received from the most recent Forward PM cell, and is used with the
received PM cell’s TUC_0 to determine the number of CLP0 user cells transmitted
between successive Forward PM cells. This count will be initialized automatically on
reception of the first Forward Monitoring cell. When not a monitor point, Fwd TUC_0
will be inserted in the TUC_0 field of generated Backwards Reporting cells.
Fwd TUC_0+1 (16) Total CLP0+1 User Cells. TUC_0+1 indicates the total number modulo 65536 of
CLP0 and CLP1 user cells transmitted just before the transmission of a Forward PM
cell.
If this PM process is the source of Forward PM cells then this field stores the value
of TUC_0+1 inserted into the most recent generated Forward PM Cell, and is used
together with the Current Cell Count CLP0+1 to determine TUC_0+1 of the
subsequent generated PM cell. This is a running count and does not need to be
initialized.
If this PM process terminates/monitors Forward PM cells, then this field stores the
value of TUC_0+1 received from the most recent Forward PM cell, and is used with
the received PM cell’s TUC_0+1 to determine the number of user cells transmitted
between successive Forward PM cells. This count will be initialized automatically on
reception of the first Forward Monitoring cell. When not a monitor point, Fwd
TUC_0+1 will be inserted in the TUC_0+1 field of generated Backwards Reporting
cells.
Fwd FMCSN
The Forward PM Cell Sequence Number. This field contains the sequence number
modulo 256 of the most recent Forward Monitoring cell generated/received. The
MCSN is incremented for each PM cell generated/received during the PM session.
When Forward PM cells are terminated or monitored, the Fwd MCSN is used to
identify lost Forward PM cells.
If the Fwd FMCSN is out of sequence, then BIP-16 calculations are not done, the Bit
Error Code is sent as all-ones in the Backwards Reporting cell, and the Fwd Lost
Fwd PM Cells counter is incremented by the number of lost Fwd PM cells. The
calculation and reporting of lost, misinserted, and tagged cells, impaired blocks, and
SECBs proceeds as normal. Any inference of SECBs due to lost Fwd PM cells is
left up to the management software.
Fwd BMCSN
The Forward Bwd PM Monitoring Cell Sequence Number is used to determine the
MCSN for generated Backwards Reporting cells. The Fwd BMCSN value is
incremented each time a Backwards Routing cell is generated. There is no need to
initialize this running count.
Bwd TRCC_0 (16)
Total Received Cell Count CLP0 for Backwards Reporting cells. This field stores
the TRCC_0 value received from the most recent Backwards Reporting cell, and is
used along with the TRCC_0 field of newly received Backwards reporting cells to
determine the number of CLP0 user cells received by the far end point between
successive Forwards Monitoring cells. This count will be initialized automatically on
reception of the first Bwd PM cell.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990553, Issue 4
125
PMC [ PMC-SIERRA, INC ]
