AudioCodes Mediant 3000 TP-6310, Руководство по мониторингу работы и системе оповещения

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Version 7.0 13 Performance Monitoring and Alarms
Performance Monitoring and Alarms 2. Performance Monitoring Parameters
2 Performance Monitoring Parameters
Customers are often faced with a complex VoIP network with little or no information on
the status and capacities of each component in it. PM helps the system architect
design a better network. PM helps operators discover malfunctioning devices before
they start causing a problem on the production network.
The system provides two types of performance measurements:

Gauges: Gauges represent the current state of a PM parameter in the system.
Gauges, unlike counters, can decrease in value, and like counters, can increase.

Counters: Counters always increase in value and are cumulative. Counters,
unlike gauges, never decrease in value unless the system is reset. The counters
are then zeroed.
Performance measurements are available for the EMS or for a 3rd party performance
monitoring system through an SNMP interface. These measurements can be polled at
scheduled intervals by an external poller or utility in a media server or another off-
device system.
PM measurements can be divided into two main groups:

Real-Time PM Measurements - supply the current value of the PM entity. When
requested, the entity is sampled and the current value is received.

History PM Measurements - supply statistical data of the PM entity during the last
interval period. These measurements include the Average, Minimum and
Maximum values of the entity during the last interval. The default interval length is
15 minutes.
Figure 1: History PM Measurements
History Performance is measured in a constant time interval of 15 minutes to which all
elements in the network are synchronized. Intervals commence precisely every 15
minutes, for example, 12:00:00, 12:15:00, 12:30:00, 12:45:00, etc. This allows
synchronization of several management systems to the same interval time frame.
Note that the first interval after start-up is always shorter (in the example above, the
first interval only lasts 6 minutes - so that a new interval can start exactly on the 15
minute interval, in this case 11:30:00). During the initial start-up interval i.e. 6 minutes
in the example above, polling is not performed.