Frame (DVB-S2/S2X)

Frame is a parameter group within the Frame Definition tab containing the following parameters:

Standard selects the DVB-S2, DVB-S2X or Super Frame standard.

DVBS2 - Selects DVBS2 (ETSI European Telecommunications Standard Institute: The European standardization body for telecommunications. EN 302 307-1) as the standard.
DVBS2X - Selects DVBS2X (ETSI EN 302 307-2) as the standard.
DVBS2X Super Frame - Selects DVBS2X Super Frame (Annex E of ETSI EN 302 307-2) as the standard. The VSA software will auto detect the super frame configuration based on the user-configured Super Frame Settings. The VSA software can automatically detect and analyze DVBS2X Super Frame formats 5, 6 and 7. When Super Frame is selected, the Result Length is measured in number of Super Frames (not DXVBS2X frames). See About DVBS2x Super Frame for more information.

Default: DVBS2

Choices: DVBS2, DVBS2X, DVBS2X Super Frame

Symbol Rate sets the frame symbol rate in Hz.

Default: 300 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second.

Roll-off Factor sets the roll-off factor. Standard roll-off factors are α = 0.35, 0.25, 0.20, 0.15, 0.10 and 0.05 per ETSI EN 302 307-1 [3], clause 5.6, although other values may be entered.

Default: 0.35

Physical Layer Signaling

Physical Layer Signaling settings are only available when the Standard parameter is set to DVBS2 or DVBS2X.

Auto Detect Mode determines whether Physical Layer Signaling (PLSCODE) parameters are automatically detected or manually configured.

None - No auto detection is enabled, so all the Physical Layer Signaling parameters need to be manually configured and are assumed not to change over the measurement interval. PLSCODE metrics in the Syms/Errs trace will display a value of '***' since the information is manually entered and not auto detected.

Static - Physical Layer Signaling parameters are auto detected, but they are assumed not to change over the measurement interval. Detected PLSCODE information is displayed in the Syms/Errs trace.

If the signal has a low SNR Signal-to-Noise Ratio, this may lead to inaccurate PLS detection across frames. In such cases, the VSA will choose the most frequently occurring PLS code for demodulation and decoding. The Syms/Errs trace will show the frame with the highest frequency of detection within the measurement interval.

Dynamic - Physical Layer Signaling parameters are auto detected, and they can change frame by frame. If Dynamic is selected and VSA detects a different PLSCODE configuration over the measurement interval, all of the detected information will be displayed in the Syms/Errs trace.

Default: None

Choices: None, Static, Dynamic

FECFrame Type determines the FECFrame type.

Normal - Sets the FECFame size to Medium (64,800 bits)

Short - Sets the FECFame size to 32,400 bits (Short)

Default: Normal

Choices: Normal, Short

MODCOD selects the S2X modulation as specified in Table 17a of the ETSI EN 302 307-2 V1.2.1 (2020-08) standard document.

Dummy

QPSK Quadrature phase shift keying-1/4

QPSK-1/3

QPSK-2/5

QPSK-1/2

QPSK-3/5

QPSK-2/3

QPSK-4/5

QPSK-5/6

QPSK-8/9

QPSK-9/10

8PSK-3/5

8PSK-2/3

8PSK-3/4

8PSK-4/5

8PSK-5/6

8PSK-8/9

8PSK-9/10

16APSK-2/3

16APSK-3/4

16APSK-4/5

16APSK-5/6

16APSK-8/9

16APSK-9/10

32APSK-3/4

32APSK-4/5

32APSK-5/6

32APSK-8/9

32APSK-9/10

QPSK-2/9

Pi/2-BPSK Binary phase shift keying - A type of phase modulation using 2 distinct carrier phases to signal ones and zeros.-1/5

Pi/2-BPSK-11/45

Pi/2-BPSK-1/3

Pi/2-BPSK-4/15

QPSK-13-45

QPSK-9/20

QPSK-11/20

8APSK(2/4/2)-100/180

8APSK(2/4/2)-104/180

8PSK-23/36

8PSK-25/36

8PSK-13/18

16APSK(8/8)-90/180

16APSK(8/8)-96/180

16APSK(8/8)-100/180

16APSK(4/12)-26/45

16APSK(4/12)-3/5

16APSK(8/8)-18/30

16APSK(4/12)-28/45

16APSK(4/12)-23/36

16APSK(8/8)-20/30

16APSK(4/12)-25/36

16APSK(4/12)-13/18

16APSK(4/12)-140/180

16APSK(4/12)-154/180

16APSK(4/12)-2/3

32APSK(4/8/4/16)-128/180

32APSK(4/8/4/16)-132/180

32APSK(4/8/4/16)-140/180

64APSK(16/16/16/16)-128/180

64APSK(4/12/20/28)-132/180

64APSK(8/16/20/20)-7/9

64APSK(8/16/20/20)-4/5

64APSK(8/16/20/20)-5/6

128APSK-135/180

128APSK-140/180

256APSK-116/180

256APSK-20/30

256APSK-124/180

256APSK-128/180

256APSK-22/30

256APSK-135/180

QPSK-11/45 Short

QPSK-4/15 Short

QPSK-14/45 Short

QPSK-7/15 Short

QPSK-8/15 Short

QPSK-32/45 Short

8PSK-7/15 Short

8PSK-8/15 Short

8PSK-26/45 Short

8PSK-32/45 Short

16APSK(4/12)-7/15 Short

16APSK(4/12)-8/15 Short

16APSK(4/12)-26/45 Short

16APSK(4/12)-3/5 Short

16APSK(4/12)-32/45 Short

32APSK(4/12/16)-2/3 Short

32APSK(4/12/16)-32/45 Short

Default: QPSK 1/4

Pilot Insertion enables or disables pilot insertion per ETSI EN 302 307-1, clause 5.5.3.

Default: Enabled

Super Frame Settings

Super Frame settings are only available when the Standard parameter is set to DVBS2X Super Frame. The VSA software can automatically detect and analyze DVBS2X Super Frame formats 5, 6 and 7. See About DVBS2x Super Frame for more information.

All of the Super Frame settings must have correct values in order to synchronize, detect and analyze a Super Frame signal.

Max Super Frame Length (when Standard = DVBS2x Super Frame) sets the maximum Super Frame length in symbols. While the length of the Super Frame may vary frame by frame, this is the maximum length of the Super Frame to be tested. The VSA software uses this value to decide the data capture length to ensure enough data for the analysis and to correctly autodetect the signal's Super Frame format.

In order to make Super Frame auto detection work, customer needs to set the max super frame length so that the whole super frame is included in the acquired data length. Also customer needs to set SOSF sequence index, Pilot sequence index, Reference data scrambling sequence index, Payload data scrambling sequence index correctly. These parameters are assumed not to change during the measurement interval.

Default: 612540 Symbols

Reference Data Scrambler Index (when Standard = DVBS2x Super Frame) sets the index of the Super Frame reference data scrambling sequence.

Default: 0

Payload Data Scrambler Index (when Standard = DVBS2x Super Frame) sets the index of the Super Frame payload data scrambling sequence.

Default: 0

SOSF Sequence Index (when Standard = DVBS2x Super Frame) sets the index of the Start of Super Frame (SOSF) sequence. The SOSF Sequence Index is needed for proper synchronization.

Default: 0

Pilot Sequence Index (when Standard = DVBS2x Super Frame) sets the index of the Super Frame Pilot sequence.

Default: 0