Avaya VoIP Monitoring Manager Release 3.1 Configuration Uživatelský manuál stáhnout pdf (Strana 40)

Jitter

40 Avaya VoIP Monitoring Manager Release 3.1 Configuration

Jitter Jitter is a measure of variance in the time it takes for communications to

traverse from the sender (application) to the receiver, as seen from the

application layer, or the difference between when a packet is supposed to be

received and when it is actually received. We tend to think of jitter as the

statistical average variance in delivery time between packets or datagrams.

Jitter displays in milliseconds.

Removing Jitter: Jitter can result from bad queuing strategies set-up on

network equipment. Check your equipment manual for recommended

settings. To remove jitter the endpoints need to collect packets and hold them

long enough to allow the slowest packets to arrive, allowing them to be played

at even intervals in the correct sequence, which causes additional delay.

Jitter Effects: Jitter can create audible voice-quality problems if the variation

is greater than 60ms. Symptoms of excessive jitter could be reported as

crackling or static. A faulty microphone or other hardware problems can be

reported as a similar sound problem to jitter but they are not related. You need

to rule out that this is not the cause of the problem.

Jitter Buffer Over

Runs

The number of jitter buffer over-runs metric represents the number of times

during a call the jitter buffer was too small. This metric is an 8-bit unsigned

integer.

Jitter Buffer Under

Runs

The number of jitter buffer under-runs metric represents the number of times

during a call the jitter buffer became empty or starved. This metric is an 8-bit

unsigned integer.

Largest Sequence

Fall (LargestSeqFall)

The Largest Sequence Fall metric represents the number of packets that are

received from when an out-of-order packet was expected to be received.

Note:

Note: A value of 0xFF implies that there were too many packets out of

order to be able to calculate the correct value.

Largest Sequence

Jump

(LargestSeqJump)

The Largest Sequence Jump metric represents the maximum number of

consecutive packets lost in the last RTCP reporting interval.

For example, when the following packet sequence numbers 1,2,3,8, are

received, the largest Sequence Jump is 4.

Note:

Note: A value of 0xFF implies that there were too many packets lost to

be able to calculate the correct value.

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