PM7340-PI datasheet(83/334 Pages) PMC

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PRELIMINARY

INVERSE MULTIPLEXING OVER ATM

PM7340 S/UNI-IMA-8

DATA SHEET

PMC-2001723

ISSUE 3

INVERSE MULTIPLEXING OVER ATM

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Figure 18

- Snapshot of DCB Buffers after deletion of links from group

DCB

Link 0

DCB

Link 1

DCB

Link 2

Write

Pointer 0

Write

Pointer 1

Group

Read

Pointer

DCB

Link3

Removed

from

group

Removed

from

group

10.2.4.3

IMA Link Error Handling

For IMA operation, the RDAT is responsible for detecting Loss of IMA Frame

defects (LIF), Idle Cells on IMA Links, Loss of Cell Delineation defects (LCD), and

DCB overruns/underruns that contribute to Loss of Delay Synchronization

(LODS). This information is forwarded to the RIPP with the ICP messages for

processing and reporting.

10.2.4.3.1

IMA Error/Maintenance State Machine (IESM)

A state machine is maintained for the LIF defect detection. This state machine is

called the IMA Error/Maintenance State machine [IESM]. The state diagram for

the IESM is shown in Figure 19. The RDAT maintains an IESM for each link. The

LIF Defect state is the initial state for this process, thus all links will initially come

up in the LIF condition.

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