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Bluetooth Timeline 1 Second Throughput Indicators
-
1-Second Payload Throughput
is the total payload over the most recent one second of duration (This
is determined by counting Bluetooth
clocks). It is cleared after each discontinuity. A
discontinuity
is when the Bluetooth clock goes
forward more than two (2) seconds or goes backwards any amount. This
is caused by either a role switch or Bluetooth
clock rollover . The
Bluetooth clock
count is used instead of timestamp difference because the Bluetooth
clock count
is precise; however, if timestamp difference were used it would not be
necessary to clear the 1-second throughput after each discontinuity. Note: The raw timestamp value is the number
of 100-nanosecond intervals since the beginning of January 1, 1601. This
is standard Windows time. - 1-second throughput is not an average. It is simply the total payload over the most recent one second of duration. Since it’s not an average, it behaves differently than average throughput. In particular, while average throughput can be very large with only a couple of packets (since it’s dividing small payload by small time), 1-second throughput is very small (since it counts only what it sees and doesn't try to extrapolate).
- A 1-second throughput is shown for all devices, master devices, and slave devices.
- A horizontal bar indicates
percentage of max, and text gives the actual throughput.