Management; Fault Management - Ericsson MINI-LINK TN R3 ETSI Technical Description

6

Management

The management functionality described in this section can be accessed from
the management tools and interfaces as described in Section 6.8 on page
119. Shortly these are:
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6.1

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.
6.1.1 Alarm Handling
MINI-LINK TN R3 uses SNMP traps to report alarms to MINI-LINK Manager
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
EEM. 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.
Alarm notifications can be enabled/disabled for an entire NE, for an individual
plug-in unit and for individual interfaces. Disabling alarm notification means that
no new alarms or event notifications are sent to the management system.
Alarm and event notifications are sent as SNMP v2c/v3 traps with a format
according to Ericsson's Alarm IRP SNMP solution set version 1.2. The following
fields are included in such a notification:
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
Embedded Element Manager (EEM) accessed using a Web browser
ServiceOn Microwave for remote O&M
Simple Network Management Interface (SNMP)
Management
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