PM7341 datasheet(107/413 Pages) PMC

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PRELIMINARY

INVERSE MULTIPLEXING OVER ATM

PM7341 S/UNI-IMA-84

DATASHEET

PMC-2000223

ISSUE 4

INVERSE MULTIPLEXING OVER ATM

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

109

detected active, the Group state machine will transition into the insufficient links

state and will stop accepting data from the ATM layer for transmission.

10.2.5.5

LASR Procedure

Links will only become active as part of the LASR procedure. The add_group

command will automatically spawn a LASR procedure. To add links or recover

links after group start-up, the Start_LASR command should be used.

If an LASR procedure is in progress, additional Start_LASR commands will be

rejected.

10.2.5.5.1

TX Links

When the LASR procedure starts, all Tx Links (participating in the LASR) in the

unusable state or not_in_group state will immediately transition into the Usable

state if they are not faulted or inhibited. (Note that the FE Rx Links may be

reporting “Not in Group” at this point since their LIDs have not been validated).

Links in other states will remain in the same state. If test patterns are to be

transmitted on the links to test them prior to putting them in service, the Tx links

should be configured to be brought up with the inhibited state set. This keeps the

Tx links in the unusable state until they are released by a new LASR command

(the PM_UNUSABLE status can only be cleared by a LASR).

Once the Tx Links start to report the Usable state, a programmable timer is

started. When either the timer expires or all of the FE Rx links report the active

state, the acceptable Tx Links will transition to the Active state. This completes

the LASR for the TX links.

10.2.5.5.2

Rx Links

During the LASR procedure, the LIDs for the receive links are validated. Until the

LIDS are validated, the RX Links report the “Not in Group” state. As the LIDS are

validated, the Rx Links start to report the unusable state. This transition is not

synchronized with other links in the group.

After all the receive links have their differential delay checked and have no

defects (obtained IMA Frame sync) or a programmable timeout occurs, all of the

accepted links will transition to the usable state.

After the rx links are reported usable, another programmable timeout is started.

Once all of the links are reported TX_Usable by the FE or the timeout expires,

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