Demod Bits (Bluetooth)

The Demod Bits trace shows the demodulated bit stream of the analyzed burst. If PDU Whitening applies, the bits are shown after de-whitening.

Use this trace to verify the transmitted payload — for example, to confirm that the device under test is sending the expected Payload Pattern for the modulation-characteristics tests.

A summary block above the bit stream identifies the packet the bits came from:

Burst — the number of the analyzed burst, matching its row in the Burst Table.
Packet Type — the configured Packet Type, or the detected one when it is set to Auto.
Coding — the active PHY Physical Layer rate.
Payload Length — the decoded payload length, in bits. Absent when the packet header did not decode.
Payload — the payload pattern the analyzer measured, such as 11110000 (Df1) or PRBS9.
CRC Cyclic Redundancy Check — PASS, FAIL, or -- when the CRC was not checked.
Sync — whether the burst synchronized.

When the selected burst never synchronized, this trace and the Demod Waveform trace show a SYNC NOT FOUND indicator, and the bits shown are not meaningful. Check the Sync column of the Burst Table to find a burst that did synchronize.