S/UNI-IMA-4 Telecom Standard Product Data Sheet
Released
Command
Delete_link
Description
Remove one or more links from the group. If the group configuration
is symmetric, links should be deleted in both the Tx and RX
directions.
When a Tx link is deleted, user traffic is no longer sent on the link and
the Tx LSM state is reported as “Not in Group”, but IMA frames are
still generated. When either a timeout expires
(TX_link_deleted_timeout) or the FE Rx is detected to be no longer
active, the deleted links stop generating IMA frames and start
generating idle cells until the link is reused.
When an Rx link is deleted, the Rx LSM state is reported as “Not in
Group”, but traffic is still received and passed to the ATM layer, until
either a timeout expires (RX_link_deleted_timeout) or FE Tx state is
detected to be no longer active. Data received after this point will no
longer be forwarded to the ATM layer. The RX link is available for
reuse after all the data accumulated in the DCB has been forwarded
to the ATM layer.
No data will be lost in the link deletion procedure unless the timeout
occurs prior to the FE state change detection.
Set_rx_phy_defect
Indicate to S/UNI-IMA-4 that the given link(s) have/have not physical
defects (such as LOS/LOF/OOF/AIS) which are not detectable
internally. This causes the S/UNI-IMA-4 to start reporting physical
layer defects in the RX Defect Indication field in the ICP field for the
affected links. When the defect bit is set in the command, this also
sets an internal state which prevents the affected LSM’s from
progressing towards active (until the unusable_link command is
issued), and immediately terminates any currently active timers which
are waiting on FE state changes for the affected LSM’s. The
termination of these timers (such as RX_link_deleted_timeout,
RX_link_blocked_timeout, or TX_link_deleted_timeout) may result in
an immediate NE LSM state change.
Unusable_link
Force Links to an unusable state and provide the cause. This
command must be issued after the set_rx_phy_defect command is
issued prior to recovering the links.
For Rx Links, if the cause is inhibited, the links are taken through the
blocking state to preserve data sent prior the link being inhibited. If
the cause is a fault or a failure condition, the link is taken directly to
the UNUSABLE state. At this point, data would have already begun
to be discarded due to the defects detected on the link.
For Tx Links, data will stop being accepted on the Unusable links and
IMA frames will be generated consisting of filler cells.
Update_test_ptn
Update_TX_TRL
Update the TX test pattern info to be sent in the outgoing ICP cells.
This command is used to activate, deactivate, or change the test
pattern that is being sent out on the Group. PM must take care to
wait at least 2 frames in between updates to the test pattern in order
to comply with the IMA test pattern standard.
Update the transmit TRL.
When a TRL is changed, three steps are performed: (1) the TRL sent
in the ICP cell is changed;(2) the TRL used for calculating the IDCC
is changed, and (3) the TRL used in the stuffing algorithm is
changed.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2020889, Issue 2
72
PMC [ PMC-SIERRA, INC ]
