BridgeTech VB20 User Manual page 81

Thumb: Click the
icon to access the Thumb pop-up view
Type: The list entry service type or PID type
PCR: This field will be checked if the corresponding PID carries PCR
Scr: This field will be checked if the corresponding PID is scrambled
Under this list the Mon - Parameters (Current parameters) measurements for the
selected stream are displayed.
In the Detailed Monitoring - IAT view the Inter Arrival Time histogram shows the
accumulated number of IAT measurements within each presented interval. Vertical
green lines indicate the maximum and minimum IAT values. By clicking the IAT range
buttons it is possible to change the zooming of the graph. If the IAT auto button is
pressed the diagram will auto-scale to always include the minimum and maximum IAT
readings.
The IAT histogram is a very useful and intuitive measure of how well the network is
performing in terms of forwarding real-time traffic. A predictable and tightly bunched
graph indicates small levels of network jitter. An unbound graph indicates network
jitter issues typically brought forward by traffic congestion or misconfigured routers.
Clicking the Clear IAT button will clear the IAT graph.
Under the IAT histogram the Mon - Parameters (Current parameters)
measurements for the selected stream are displayed.
Clicking the Clear button will clear all information about the selected stream,
including PSI/SI analysis data.
Clicking the MediaWindow button will open the Media Window Selected channel
view. This is described in section 6.5.
PROBE USERS' MANUAL VERSION 5.0
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