Ericsson EFN324, User Manual, Page: 88 / 176

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12 EFN324 Alarms
The EFN324 sends alarms as SNMP traps or notifications. Depending on the
SNMP version, alarm events are named traps, notifications or informs. Trap is
an SNMPv1 term. Notification and inform are both related to SNMPv2, where
inform is a message type requiring an acknowledgement from the SNMP
manager that the message was received. A notification does not require an
acknowledgement. The EFN324 is able to handle all three alarm­types and
these can be configured individually per destination (named target). By default,
the EFN324 sends the alarms as notifications using SNMPv2.
12.1 Standard Alarm Format
The format of the alarms from the EFN324 adheres to the ITU­T X.733
standard, which specifies alarm handling in telecommunication networks. The
following parameters are mandatory in all alarms:
Table 8 Additional Alarm Parameters according to X.733 Standard
Parameter Name Description Coding
Managed object class Device or device Port Display string
Managed object
Instance Port number if relevant Display string
Sequence number Sequence number;
counter incremented for each
alarm message sent
Unsigned
integer
Perceived severity Critical, Major, Minor, Warning
or Cleared
Integer
Event time Time stamp from real time clock
retrieved through a SNTP server
Octet string
Event type Indicates a high­level grouping
of the alarms, according to the
X.733 standard
Integer
Probable cause Follows the X.733 standard Integer
After these parameters, alarm specific variable parameters are added.