6.7.5 Traffic — Microbitrate
The Microbitrate feature allows sampling of bitrate at various sampling intervals. When enabling this
feature, each Ethernet frame is timestamped in hardware on probe ingress. This timestamp is used to
calculate exact bitrates at various sampling intervals.
The
Interval
is the sampling interval of each bitrate calculation. There are 4 intervals tracked simultane-
ously.
The
Max interval frames
is the max number of frames within one interval last second. The
Max interval
bitrate
is the max sum of Ethernet frame sizes inside one interval last second converted to bits per
second. This number should always be bigger or equal for shorter intervals.
Click the legends in the graph to show or hide graphs.
The above graph is a typical OTT-traffic graph where the client periodically requests limited amounts of
data at maximum speed resulting in traffic that is bursting near line-speed at 1 Gbit/s for short intervals
while the average bitrate for larger intervals is only a fraction. This traffic shape is challenging for network
equipment since it demands all remaining capacity up to line speed.
VB2xx GigE User’s Manual version 5.4 117
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