PM7340-PI datasheet(75/334 Pages) PMC

75 / 334 page

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 10

- IFSM State Machine

Missing ICP Cell

αα

α====consecutive

invalid ICP cells

ββββ====consecutive

errored ICP cells

IMA SYNC

(frame by frame)

γγγγ====consecutive

valid ICP cells

One valid

ICP cells

IMA HUNT

(cell by cell)

One invalid or

errored/missing

ICP cell

IMA PRESYNC

(frame by frame)

Starting

State

Valid ICP at unexpected position (with cell by cell hunting)

Valid ICP at unexpected position

(with cell by cell hunting)

During group start-up, the fields in the ICP cells are validated by the RX IMA

Protocol Processor (RIPP) block and the validated information is used to

determine whether the ICP cells are valid or not. Validation by the RIPP checks

the group fields of the ICP cell to ensure that they match the rest of the group

and checks the LID to ensure that it is unique in the group. An ICP cell is invalid

if either the IMA OAM Label, the LID, the IMA_ID, M, IFSN or the offset is not the

same as the validated values. If the ICP cell cannot be validated by the RIPP (.i.e

the IMA_ID is different from the rest of the group or the LID is a duplicate), the

IFSM will remain in the starting state.

Once the ICP cells are validated by the RIPP, the IFSM will enter the IMA Hunt

state. In this state, each cell will be examined to see if it is a valid ICP cell. When

a single valid ICP cell has been received, the IFSM will enter the IMA Presync

state.

While in the Presync state, at each expected ICP location (determined by the ICP

offset and the IMA Frame Length), the cell will be examined (frame by frame).

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