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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
277
12.5.6 Inhibit Group/Not inhibit Group
To move a GSM into/out of the Blocked state, the Inhibit_group and
Not_inhibit_group commands may be used. These commands set a mode such
that the current GSM state is not important. Once set to the inhibit mode, the
GSM will go to the Blocked state instead of the Operational state. The
Not_inhibit_group command must be executed to remove this setting.
12.5.7 Adding a link or Links to an existing Group (Start LASR)
In order to add links to an existing group, the START_LASR command is used.
Prior to issuing this command, the link configuration should be performed as in
12.4.3.2. The Start_LASR command will initiate the Link Addition and Slow
Recovery Procedure. The LASR procedure is paced by either (1) all of the
indicated links’ LSMs transitioning to the appropriate states or (2) the
programmed link timeouts in the presence of defective or slow links.
The LASR procedure continues after the CMD_ACK is returned. While a LASR
procedure is in process, no other LASR procedure may be started on the same
group.
The completion of the command is generally indicated by an event that indicated
either that the process timed-out or the links have become operational. If a
timeout occurs, plane management should take appropriate action and either
restart the LASR procedure in the case that the handshaking was just slow or
replace defective links.
The event that indicates that the Start_LASR command has completed
successfully for symmetrical groups is the TX_ACTIVE_INT for all links involved.
Due to the group wide synchronization, this event should occur for all links
simultaneously. For asymmetrical groups, the RX_ACTIVE_INT indicates the
completion of the LASR for receive links.
Events that indicate that individual links are experiencing problems and did not
become active are the following:
DIFF_DELAY_INT
INVALID_ICP_INT
RX_TIMEOUT_INT
TX_TIMEOUT_INT
If a timeout event occurs, another LASR procedure must be execute to continue
attempting to bring links to the active state.