S/UNI®-ATLAS-3200 Telecom Standard Product Data Sheet
Preliminary
The S/UNI-ATLAS-3200 accepts cells ranging from 52 bytes (1 d-word of header and 12 of
payload) to 64 bytes (2 prepends or postpends, 1 d-word of header, 1 d-word of HEC and UDF,
and 12 of payload). The HEC/UDF fields are optional, and there may be no
prepended/postpended d-words, one or two prepended d-words, one or two postpended d-words,
or one prepend and one postpend. The S/UNI-ATLAS-3200 can also send words with any of
those combinations. Prepended, Postpended and HEC/UDF d-words are added, translated, or
deleted as necessary to adjust from the input cell interface configuration to the output cell
interface configuration, and to match the global header translation instructions.
Prepended or Postpended words are replaced with or generated from the contents of the
Translated Pre/Po1 and Translated Pre/Po2 fields if the XPREPO bit is logic 1 in the Cell
processor Configuration register. If XPREPO is logic 0, but the output cells have prepends or
postpends associated, then generated cells will contain 6A6A6A6A hex in those fields. As an
additional option, the prepended/postpended words may be replaced with a descriptive word
identifying the cell’s VC Record, cell type, and some information about the connection. This Cell
Info Field is identical to the Microprocessor Cell Info Field described in Section 10.17.5; its
insertion is controlled by the Cell_Info_to_OCIF bit in the Cell Processor Configuration Register.
The header contents of each cell can be altered, and replaced with the contents of the Translated
VPI and Translated VCI fields. Substitution of the VPI/VCI contents can be enabled by setting
the XVPIVCI register bit. The PTI and CLP fields are not modified by the header translation
process. If the connection is a Virtual Path (i.e. the VCI value in the VC Table is coded as all
zeros), the VCI field is passed through transparently. As a globally configured option, the GFC
field in UNI cells can be left unmodified; otherwise, it is replaced by the four most significant bits
of the Translated VPI field. The HEC and UDF fields can be passed through transparently, or
replaced by the Translated HEC and Translated UDF fields of the VC Table, as configured by the
XHEC and XUDF bits.
10.7 Cell Rate Policing
10.7.1 Per-VC Policing
The S/UNI-ATLAS-3200 supports two instances of the Generic Cell Rate Algorithm (GCRA) for
each connection. The policing operation is performed according to the Virtual Scheduling
Algorithm outlined in ITU-T I.371. The per-VC policing fields are held in the VC table in Rows
0,1, and 3.
Table 16 VC Table Policing Fields
Row
0
127
Action 2
(2)
0
2
Inc 2
(14)
Limit 2
(14)
Action 1
(2)
Inc 1
(14)
Limit 1
(14)
Field B
(12)
VPI
VCI
(16)
Bwds
VC Table
(12)
VCRA (16) CRC-10 (10)
Status
(10)
Configuration OAM
(14)
Internal
Policing
Reserved Maximum
GFR State
Policing
ETE Received Segment
1
Configuration Status
Configuration (16)
(11)
Frame Length (3)
Reserved
(3)
Defect Type
(8)
Received
Defect Type
(8)
(23)
(21)
(11)
Unused Remaining Frame Count Non-Compliant Count 3 Non-Compliant Count 2 Non-Compliant Count 1 TAT2 (34)
(1) (11) (16) (16) (16)
TAT1 (34)
3
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990553, Issue 4
91
PMC [ PMC-SIERRA, INC ]
