7.2 QoS Alarm Types and Thresholds

All QoS alarms operate on a per-channel basis. That is, a QoS alarm indicates the status of particular channel during a particular session, not the status of an entire IP media resource board. The QoS alarms and thresholds described in this section are defined in the IPM_QOS_THRESHOLD_DATA data structure.

The following QoS alarms are identified by the enumeration eIPM_QOS_TYPE:

EVT_DTMFDISCARDED

number of lost DTMF digits since the beginning of the call; indicates the system could not process the digits that were sent (Intel® NetStructure™ DM/IP Series boards only)

EVT_LOSTPACKETS

percent of lost packets per second since the beginning of the call

EVT_JITTER

average jitter since the beginning of the call (in msec)

EVT_ROUNDTRIPLATENCY

RTP packet latency (Intel® NetStructure™ IPT Series boards only)

Each QoS alarm has the following threshold attributes:

Note: Only the unFaultThreshold field is supported on Intel® NetStructure™ IPT Series boards.

unTime_Interval

amount of time between two QoS parameter measurements (in multiples of 100 msec)

unDebounceOn

time interval for measuring potential alarm set condition (in msec., must be multiple of unTime_Interval).

unDebounceOff

time interval for measuring potential alarm clear condition (in msec., must be multiple of unTime_Interval)

unFaultThreshold

alarm threshold value. When this value is exceeded, the unDebounceOn timer is triggered. The units for unFaultThreshold are dependent on what alarm is being measured. In the case of the Lost Packets alarm, unFaultThreshold is measured in lost packets per second.

unPercentSuccessThreshold

number of poll instances that the error threshold must be exceeded in a unDebounce_On time interval before declaring alarm (expressed as a percentage of successes)

unPercentFailThreshold

number of poll instances that the error threshold was not exceeded in unDebounce_Off time interval before clearing alarm (expressed as a percentage of failures)

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