Ericsson MINI-LINK TN R4 ETSI, Technical Description

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Management
5 Management
The management functionality described in this section can be accessed from
the management tools and interfaces as described in Section 5.8 on page
120. Shortly these are:
• MINI-LINK Craft for local O&M
• ServiceOn Microwave for remote O&M
• ServiceOn Network Manager (SoNM)
• ServiceOn Ethernet Service Activator
• Simple Network Management Interface (SNMP)
5.1 Fault Management
All software and hardware in operation is monitored by the control system.
The control system locates and maps faults down to the correct replaceable
hardware unit. Faults that cannot be mapped to one replaceable unit result in a
fault indication of all suspect units (this may be the whole NE).
Hardware errors are indicated with a red LED found on each plug-in unit and
RAU.
The control system will generally try to repair software faults by performing
warm restarts on a given plug-in unit or on the whole NE.
5.1.1 Alarm Handling
MINI-LINK TN R4 uses SNMP traps to report alarms to ServiceOn Microwave
or any other SNMP based management system. To enable a management
system to synchronize alarm status, there is a notification log (alarm history
log) where all traps are recorded. There is also a list of current active alarms.
Both these can be accessed by the management system using SNMP or from
the MINI-LINK Craft. The alarm status of specific managed objects can also
be read.
In general, alarms are correlated to prevent alarm flooding. This is especially
important for high capacity links like STM-1 where a defect on the physical
layer can result in many alarms at higher layer interfaces like VC-12 and E1.
Correlation will cause physical defects to suppress alarms, like AIS, at these
higher layers.
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