User manual

Figure 4.80 - A positive discontinuity
When there are one or more discontinuities the actual time encompassed by the visible timeline differs from
the zoom level duration that would apply in the absence of any discontinuities. The actual time, referred to as
absolute time, is shown followed by “(abs)”. The zoom level duration, referred to as relative time, is shown
followed by “(rel)”. When there are no discontinuities, relative and absolute time are the same and a single
value is shown.
Figure 4.81 - Timeline header with discontinuity
Figure 4.82 - Timeline duration footer with discontinuity
For example, the timeline above has a zoom level duration of 15.625 ms (the relative time shown in the
footer). But the discontinuity graphic consumes the width of a Bluetooth slot (625 µs), and that area is 7.19984
s of absolute time as shown by the Gap value in the header. So the absolute time is 7.21484 s:
Zoom level duration – Bluetooth slot duration + Gap duration =
15.625 ms - 625 µs + 7.19984 s =
0.015625 s – 0.000625 s + 7.199840 s =
0.015000 s + 7.199840 s =
7.214840 s =
7.21484 s
High-speed Bluetooth packets, where Bluetooth content hitches a ride on 802.11 packets, have a blue
frequency range box instead of orange as with regular 802.11 packets (both are shown below), and the tool
tip has two colors, orange for 802.11 layers and blue for Bluetooth layers.
TELEDYNE LECROY Chapter 4 Capturing and Analyzing Data
126 Frontline BPA low energy Hardware & Software User Manual