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2009-08-31T18:16:25Z

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The link alarm (event) notification message is received by the host application when a MTP3 link is reporting an error.

General explanation of the field of event notification link alarm:
*The '''Link handle''' field specifies the handle of the MTP3 link instance

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*The '''Alarm''' field indicates an alarm that can be reported at the link level. The following values are allowed:

{| class="wikitable" border="1"
! width="150" style="background:#efefef;" | Link Alarm
! width="350" style="background:#efefef;" |Description
|-
| Up|| Link activated or restored
|-
| Down|| Link deactivated or failed
|-
| MTP2 not available|| MTP2 link has been removed
|-
| Inhibited locally|| Link inhibited locally (management initiated)
|-
| Inhibited remotely|| Link inhibited remotely (remote node initiated action)
|-
| Uninhibited locally|| Link uninhibited locally (Manager ctrl request)
|-
| Uninhibited remotely || Link uninhibited by remote end
|-
| Inhibited denied || Link inhibit request from management denied
|-
| Uninhibited denied|| Link uninhibit request from management denied
|-
| Blocked locally || Link locally blocked (Manager ctrl request)
|-
| Blocked remotely|| Link remotely blocked (unknown cause)
|-
| Unblocked locally|| Link unblocked (Manager ctrl request)
|-
| Unblocked remotely|| Link unblocked by remote end (unknown cause)
|-
| Congested|| Local link congested
|-
| Congestion stopped || Local link congestion abated
|-
| Emergency|| Link is in emergency state
|-
| Emergency stopped|| Link is no more in emergency state
|-
| Invalid SLC remote end|| A signaling link test message (SLT/SLA) received with an invalid SLC
|-
| Invalid OPC remote end|| A signaling link test message (SLT/SLA) received with an invalid OPC
|-
| SDT data drop|| Data dropped; the cause will also be set
|}

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*The '''Cause''' field specifies the alarm cause according to alarm type. The following values are allowed:

{| class="wikitable" border="1"
! width="250" style="background:#efefef;" |Link Alarm Cause
! width="350" style="background:#efefef;" |Description
|-
| Decode error || Decode error
|-
| Invalid message length|| Invalid message length
|-
| Link is inactive|| Link is inactive
|-
| Timer T17 expired|| Timer T17 expired
|-
| Invalid OPC|| Invalid OPC
|-
| Remote negatively acknowledged|| Remote end negatively acknowledged
|-
| Unknown|| Unknown cause
|-
| Invalid test pattern|| Invalid test pattern in SRT/SRA
|-
| Uninhibition in progress|| Uninhibition in progress
|-
| No remote acknowledgment|| No acknowledgment received from remote end
|-
| Path unavailable|| Route to the point code not available
|-
| Restoration failed|| Link restoration failed
|-
| T32 expired|| Timer T32 (SLT Timer) expired
|-
| Remote initiation|| Remote node initiated action
|-
| Management initiation|| Layer manager initiated action
|-
| Local route management initiation|| Route management initiated action
|-
| Self-restart|| Action due to self-restart
|-
| Adjacent restart|| Action due to adjacent restart
|-
| NIF OPC|| --
|-
| Invalid DPC|| Invalid DPC
|-
| Inhibition in progress|| Inhibition in progress
|-
| MTP2 layer disconnected|| MTP2 layer disconnected
|-
| Linkset deactivated|| Linkset deactivated
|-
| DPC unavailable|| DPC unavailable
|-
| Slave synchronization|| Slave synchronization
|}

MTP3:Link Alarms - Revision history

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