Exfo RTU 310-310G IP Services Test Head Bedienungsanleitung PDF herunterladen (Seite 271)

100

101

IPTV Tabs

Ethernet and Fibre Channel Application 259

Overview

 DF (ms): The Delay Factor (DF) provides a measure of the maximum

packet delay variation over a period of 1 second. In other words, the

metric presents in milliseconds how much buffer would be required in

the next downstream network element to compensate for the media

packet jitter. Note that by definition (as detailed in RFC 4445) a DF

value representing a minimum of one line packet (in ms) is reported

when no jitter exists in the network. This represents the minimum

buffer size (in ms) required to properly process a media packet and

this value changes depending on the media rate of the stream. For

example, if no jitter exists in the network, a typical Standard Television

stream with a media rate of 3.75 Mbps would exhibit a Delay Factor of

2.81 ms while for a High Definition Television stream of 10 Mbps the

Delay Factor would be 1.05 ms.

 MLR (pps): Indicates the count of lost packets in the last second

(packets per second) as per RFC 4445, out-of-order and duplicate are

considered lost packets.

 TR 101 290: By default this column presents the PCR Jitter value. If any

of the supported TR 101 290 alarm occurs then the alarm temporarily

replaces the PCR Jitter. Supported TR 101 290 alarms are PCR Jitter, TS

Sync Loss, Sync Byte Error, PAT Error2, CC Error, PMT Error2, PID

Error Video, and PID Error Audio.

PCR Jitter (ms): Indicates the maximum absolute difference between

a known reference and the PCR value decoded from the MPEG-2

Transport Stream packets in the last second.

 IP Rate (Mbps): Indicates the number of IP bits received in the last

second (Mbps).

 BW (%) (Bandwidth): Indicates the Ethernet bandwidth utilization of

the stream.

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