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Telephony metrics monitoring 45

Nortel Business Communications Manager 5.0

Fault and Performance Management

NN40170-701 01.01 Standard

August 2009

Variable definitions

Variable Value

Metric Contains the following PVQM metrics to monitor:

• Packet Loss Rate: The fraction of RTP data

packets from the source lost since the

beginning of the call, expressed as a

percentage.

• Inter-arrival Jitter: The inter-arrival time of

incoming RTP packets, as defined in RFC

1889. Expressed in milliseconds.

• RTCP Round Trip Delay: The round trip time of

incoming RTP packets, as defined in RFC

1889. Measured in milliseconds.

• Listening R Factor: A scale from 0 (lowest

quality) to 100 (highest quality) according to

ITU-T G.107.

Warning (desktop) The number of warnings you can receive for a

desktop phone model. The value ranges and

default thresholds are as follows:

• Packet Loss Rate: The value range for this

metric is 0 to 100. The default value for warning

thresholds is 1%.

• Inter-arrival Jitter: The value range for this

metric is 0 to 1000. The default value for

warning thresholds is 50 ms.

• RTCP Round Trip Delay: The value range for

this metric is 0 to 1000. The default value for

warning thresholds is 300 ms.

• Listening R Factor: The value range for this

metric is 0 to 100. The default value for warning

thresholds is 65.

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Avaya Business Communications Manager 5.0 - Fault and Performance Management Manuale Utente Pagina 45