PM7340-PI datasheet(96/334 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

the accepted links will start to report RX_Active. If operating in symmetrical

mode, the TE Tx links nmust be in the usable/Active state in order for the

accepted links to transition into RX_Active. If some additional links have become

usable since the last timeout, they will skip directly from the unusable to the

active state.

This completes the LASR for the Rx Links. When the LASR for both the RX and

TX links is complete, the LASR procedure is complete. If the LASR completes

due to a timeout and not all of the links are in the active state, an interrupt will be

generated (if enabled) to inform plane management that the links were not

brought to the active state.

10.2.5.6

Deactivating Links

Links may be brought down by either the plane management or by the far end.

Plane management may declare a fault on a link, inhibit a link, or delete the link.

The Far-end state changes may also cause the link to go down. This is the

method of coordinating link deactivation between the NE and FE.

10.2.5.6.1

Far End link deactivation

If the FE Tx states transition into an unusable state, the NE Rx states go to the

usable state and all data received prior to this point will be played out.

If the FE Rx states transition into a not active state, the NE Tx link will transition

into the usable state and stop transmitting data on that link.

10.2.5.6.2

Near End (management) link deactivation

If the NE Rx link is removed from the group, the S/UNI-IMA-8 will transition to the

deleted state until all previously received data is played out to the ATM layer; at

which point, it will deactivate itself and be removed from the round-robin.

In absence of defects, the S/UNI-IMA-8 will bring down the link without loss of

data.

10.2.5.7

Rate Changes

When the RIPP changes the state of a link to active, it programs the appropriate

IDCC scheduler with the new rate. This is done by providing a vector that

identifies the active LIDs for the group. This vector is used to determine the

PM7340-PI Datasheet(PDF) 96 Page - PMC-Sierra, Inc

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