OFDM Burst Info (802.11n/ac/ax/be)

OFDM Burst Info shows PLCP Physical layer convergence protocol (PHY Physical Layer Layer Convergence Protocol) summary data for the active Data Burst that is currently being analyzed. Not all elements are present in all signals.

This data shows what fields were detected in the burst and gives the modulation format, number of OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. symbols, and power level for each field. For SIG and Data fields, the EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. is given as well. The average EVM is displayed in the Total row.

PLCP packet elements are:

L-STF: Legacy (non-HT high throughput) Short Training Field
L-LTF: Legacy (non-HT) Long Training Field
L-SIG: Legacy (non-HT) Signal Field
L-Data: Legacy (non-HT) Data Field
RL-SIG: Repeated Legacy (non-HT) Short Training Field
HT-STF: High Throughput Short Training Field
HT-LTF: High Throughput Long Training Field
HT-SIG: High Throughput Signal Field
HT-Data: High Throughput Data Field, which includes the PSDU 1) PHY Service Data Unit, or 2) PLCP SDU (PHY sub-layer Service Data Unit)
VHT-SIG: Very High Throughput Signal Field
VHT-LTF: Very High Throughput Long Training Field
VHT-SIG -A1: First Symbol of Very High Throughput Signal Field A
VHT-SIG -A2: Second Symbol of Very High Throughput Signal Field A
VHT-SIG -B: Very High Throughput Signal Field B
VHT-Data: Very High Throughput Data Field
EHT-U-SIG1: Extremely High Throughput Universal Signal 1 Field
EHT-U-SIG2: Extremely High Throughput Universal Signal 2 Field
EHT-SIG: Extremely High Throughput Signal Field
EHT-STF: Extremely High Throughput Short Training Field
EHT-LTF: Extremely High Throughput Long Training Field
EHT-DATA: Extremely High Throughput Data Field

Format - Summary of the signal that was found and shows the signal bandwidth, whether the signal is Legacy, Non-HT Duplicate, HT-mixed, HT-greenfield, or VHT very high throughput (VHT) physical (PHY) layer protocol data unit (PPDU):A PPDU transmitted using the TXVECTOR FORMAT parameter equal to VHT.. For an HT-Duplicate signal, "duplicate" is added to the line. The Format information also shows the number of streams for HT-mixed, HT-greenfield, or VHT signals. Legacy signals are always 1 stream since they are 802.11a signals. Non-HT Duplicate signals are also always 1 stream.

PSDU- This metric shows the CRC Cyclic Redundancy Check status of the PSDU.

When Decode PSDU and Verify CRCs is disabled, the PSDU status will show DecodingDisabled.

When Decode PSDU and Verify CRCs is enabled, the PSDU status will show one of the following:

CRCPassed: all the CRCs for the MPDUs in the frame pass.
CRCFailed: at least one MPDU medium access control (MAC) protocol data unit: The unit of data exchanged between two peer MAC entities using the services of the physical layer (PHY). CRC fails.
NotEnoughSymbols: a partial frame has been captured and some CRCs cannot be calculated.
***: no data.

Standard - Summary of the standard information that was detected from the demodulation of the frame. Standard information includes signal and PPDU PLCP Protocol data unit type (EHT MU Multi-user PPDU, HE trigger-based PPDU, etc.). "Unknown" is displayed if standard information cannot be detected.

SIG symbol status - The OFDM Burst Info trace data also includes the status of each SIG symbol (e.g., HE-SIG-A, EHT-U-SIG, HT-SIG High-Throughput SIGNAL field, L-SIG Non-HT SIGNAL field) except VHT-SIG-B and EHT-SIG. The possible status values are listed for each SIG symbol in the OFDM SIG Info trace topic.

GammaPhsRot - Summary of gamma phase rotation, either automatically detected or manually selected using the Gamma Phase Rotation parameter. Gamma phase rotation is only available for 320 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. bandwidth 802.11be signals.

Det. Punc. - Summary of the 20 MHz punctured segments that are detected when Puncturing Configuration is set to Automatic. Puncturing is only applicable for some 802.11ax, 802.11be, and non-HT Duplicate frames. "P" corresponds to 20 MHz punctured segments. "N" corresponds to 20 MHz segments that are not punctured. You will see *** if not available.