PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
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
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