S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
Figure 23 Group Statistics Flow Diagram
IDCC Request Available
and RDAT Enabled
No
Is IDCC Request
type IMA?
Yes
IMA Group Statistics
TC Group Statistics
Do the embedded
Is the MCFD channel
Yes
No
sequence and
full (or shadow
channel for single
mode?)
Increment IMA
dropped_cells
Increment IMA filler_cells
pointers match, and
valid bit set?
Yes
No
Is the MCFD channel
Yes
Increment IMA atm_cells
Increment IMA
dropped_cells
full (or shadow
channel for single
mode?)
No
Increment IMA atm_cells
10.2.5 Receive IMA Protocol Processor (RIPP)
The Receive IMA Protocol Processor (RIPP) block is responsible for maintaining and
controlling the link and group state machines. The RIPP can accept commands from the
management plane to initiate group and link state machine actions. The RIPP then controls the
contents of ICP cells generated for the transmit data path, as well as analyzes the link and group
states received within the ICP cells. The receive link and group states are utilized to maintain
and update the link and group states. The RIPP coordinates group-wide state transactions and
performs the group-wide procedures such as the Synchronized Link activation during Group
Start-up Procedure and the Link Addition and Slow Recovery (LASR) procedure. When the
links change state, the RIPP also coordinates the rate change between the round-robin
procedures located in the receive and transmit data paths and their respective rate schedulers.
Since failures are based upon the persistence of defects, the defects are detected and passed as
interrupts/status to the management plane. PM is responsible for the integration of defects into
failure conditions and to set the failure conditions in the S/UNI-IMA-4.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
70
PMC [ PMC-SIERRA, INC ]
