Rohde&Schwarz R&S®SMCVB-K167 DVB-S User Manual
R&S®SMCVB-K167
DVB-S
User Manual
(;Ý:È2)
1179105802
Version 04
This document describes the following software option:
●
R&S®SMCVB-K167 DVB-S / DVB-S2 (1434.3954.xx)
This manual describes firmware version FW 5.00.122.xx and later of the R&S®SMCV100B.
© 2022 Rohde & Schwarz GmbH & Co. KG
Muehldorfstr. 15, 81671 Muenchen, Germany
Phone: +49 89 41 29 - 0
Email: info@rohde-schwarz.com
Internet: www.rohde-schwarz.com
Subject to change – data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
1179.1058.02 | Version 04 | R&S®SMCVB-K167
The following abbreviations are used throughout this manual: R&S®SMCVB is abbreviated as R&S SMCVB
R&S®SMCVB-K167
Contents
1 Welcome to the DVB-S / DVB-S2 option.............................................. 5
1.1 Accessing the DVB-S / DVB-S2 dialog........................................................................5
1.2 What's new.....................................................................................................................5
1.3 Documentation overview..............................................................................................5
1.3.1 Getting started manual....................................................................................................6
1.3.2 User manuals and help................................................................................................... 6
1.3.3 Service manual............................................................................................................... 6
1.3.4 Instrument security procedures.......................................................................................6
1.3.5 Printed safety instructions............................................................................................... 7
1.3.6 Data sheets and brochures............................................................................................. 7
1.3.7 Release notes and open source acknowledgment (OSA).............................................. 7
Contents
1.3.8 Application notes, application cards, white papers, etc...................................................7
1.4 Scope............................................................................................................................. 8
1.5 Notes on screenshots...................................................................................................8
2 About the DVB-S / DVB-S2 option........................................................ 9
2.1 Required options...........................................................................................................9
3 DVB-S configuration and settings......................................................10
3.1 General settings.......................................................................................................... 10
3.2 Input signal settings................................................................................................... 11
3.2.1 General settings............................................................................................................ 12
3.2.2 Info................................................................................................................................ 14
3.2.3 Test signal settings........................................................................................................16
3.2.4 IP channel x settings..................................................................................................... 17
3.3 Coding settings........................................................................................................... 21
3.4 Special settings...........................................................................................................22
3.5 Global connector settings..........................................................................................23
3.6 TS player...................................................................................................................... 24
3.6.1 TS Player settings......................................................................................................... 25
3.6.2 Player output settings....................................................................................................28
3.6.3 Seamless loop settings................................................................................................. 32
3.7 Local IP data network settings.................................................................................. 33
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4 Performing DVB-S / DVB-S2 signal generation tasks.......................36
4.1 Configuring the input signal...................................................................................... 36
4.1.1 How to apply an external IP input signal....................................................................... 36
4.1.2 How to apply an external TS input signal......................................................................39
4.1.3 How to generate an internal TS signal.......................................................................... 40
4.2 Monitoring the input signal........................................................................................ 41
4.2.1 How to monitor external IP input data........................................................................... 41
4.2.2 How to monitor an external TS input signal.................................................................. 42
4.2.3 How to monitor an internal TS player signal................................................................. 42
5 Remote-control commands.................................................................43
5.1 General commands.....................................................................................................44
5.2 Input signal commands.............................................................................................. 46
Contents
5.2.1 General commands.......................................................................................................46
5.2.2 Info commands..............................................................................................................48
5.2.3 Test signal commands...................................................................................................50
5.2.4 IP subsystem.................................................................................................................53
5.3 Coding commands......................................................................................................56
5.4 Special commands......................................................................................................57
5.5 TSGen subsystem.......................................................................................................58
5.6 BCIP subsystem..........................................................................................................66
Glossary: Abbreviations......................................................................70
Glossary: Specifications..................................................................... 72
List of commands................................................................................ 73
Index......................................................................................................75
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1 Welcome to the DVB-S / DVB-S2 option
The R&S SMCVB-K167 is a firmware application that adds functionality to generate
signals in accordance with the DVB-S / DVB-S2 digital standards.
The R&S SMCVB-K167 option features:
●
●
This user manual contains a description of the functionality that the application provides, including remote control operation.
All functions not discussed in this manual are the same as in the base unit and are
described in the R&S SMCV100B user manual. The latest version is available at:
www.rohde-schwarz.com/manual/SMCV100B
Installation
Welcome to the DVB-S / DVB-S2 option
Documentation overview
DVB-S signal generation
Basic DVB-S2 signal generation
You can find detailed installation instructions in the delivery of the option or in the
R&S SMCV100B service manual.
1.1 Accessing the DVB-S / DVB-S2 dialog
To open the dialog with DVB-S / DVB-S2 settings
► In the block diagram of the R&S SMCV100B, select "Baseband > DVB-S / DVB-
S2".
A dialog box opens that displays the provided general settings.
The signal generation is not started immediately. To start signal generation with the
default settings, select "State > On".
1.2 What's new
This manual describes firmware version FW 5.00.122.xx and later of the
R&S®SMCV100B.
Compared to the previous version there are editorial changes only.
1.3 Documentation overview
This section provides an overview of the R&S SMCV100B user documentation. Unless
specified otherwise, you find the documents on the R&S SMCV100B product page at:
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www.rohde-schwarz.com/manual/smcv100b
1.3.1 Getting started manual
Introduces the R&S SMCV100B and describes how to set up and start working with the
product. Includes basic operations, typical measurement examples, and general information, e.g. safety instructions, etc. A printed version is delivered with the instrument.
1.3.2 User manuals and help
Separate manuals for the base unit and the software options are provided for download:
●
●
Welcome to the DVB-S / DVB-S2 option
Documentation overview
Base unit manual
Contains the description of all instrument modes and functions. It also provides an
introduction to remote control, a complete description of the remote control commands with programming examples, and information on maintenance, instrument
interfaces and error messages. Includes the contents of the getting started manual.
Software option manual
Contains the description of the specific functions of an option. Basic information on
operating the R&S SMCV100B is not included.
The contents of the user manuals are available as help in the R&S SMCV100B. The
help offers quick, context-sensitive access to the complete information for the base unit
and the software options.
All user manuals are also available for download or for immediate display on the Internet.
1.3.3 Service manual
Describes the performance test for checking compliance with rated specifications, firmware update, troubleshooting, adjustments, installing options and maintenance.
The service manual is available for registered users on the global Rohde & Schwarz
information system (GLORIS):
https://gloris.rohde-schwarz.com
1.3.4 Instrument security procedures
Deals with security issues when working with the R&S SMCV100B in secure areas. It
is available for download on the Internet.
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1.3.5 Printed safety instructions
Provides safety information in many languages. The printed document is delivered with
the product.
1.3.6 Data sheets and brochures
The data sheet contains the technical specifications of the R&S SMCV100B. It also
lists the options and their order numbers and optional accessories.
The brochure provides an overview of the instrument and deals with the specific characteristics.
See www.rohde-schwarz.com/brochure-datasheet/smcv100b
1.3.7 Release notes and open source acknowledgment (OSA)
The release notes list new features, improvements and known issues of the current
firmware version, and describe the firmware installation.
Welcome to the DVB-S / DVB-S2 option
Documentation overview
The open-source acknowledgment document provides verbatim license texts of the
used open source software.
See www.rohde-schwarz.com/firmware/smcv100b
1.3.8 Application notes, application cards, white papers, etc.
These documents deal with special applications or background information on particular topics.
See www.rohde-schwarz.com/application/smcv100b
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1.4 Scope
Tasks (in manual or remote operation) that are also performed in the base unit in the
same way are not described here.
In particular, it includes:
●
●
●
●
For a description of such tasks, see the R&S SMCV100B user manual.
Welcome to the DVB-S / DVB-S2 option
Notes on screenshots
Managing settings and data lists, like saving and loading settings, creating and
accessing data lists, or accessing files in a particular directory.
Information on regular trigger, marker and clock signals and filter settings, if appropriate.
General instrument configuration, such as checking the system configuration, configuring networks and remote operation
Using the common status registers
1.5 Notes on screenshots
When describing the functions of the product, we use sample screenshots. These
screenshots are meant to illustrate as many as possible of the provided functions and
possible interdependencies between parameters. The shown values may not represent
realistic usage scenarios.
The screenshots usually show a fully equipped product, that is: with all options installed. Thus, some functions shown in the screenshots may not be available in your particular product configuration.
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2 About the DVB-S / DVB-S2 option
DVB-S and DVB-DSNG are DVB standards for satellite services. DSNG is the abbreviation for digital news gathering.
DVB-S complies with specification EN 300 421.
DVB-DSNG complies with specification EN 301 210.
2.1 Required options
The equipment layout for generating DVB-S / DVB-S2 signals includes:
●
●
●
About the DVB-S / DVB-S2 option
Required options
Base unit
Option Enable Broadcast Standard (R&S SMCVB-K519)
Option DVB-S / DVB-S2 (R&S SMCVB-K167)
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3 DVB-S configuration and settings
Access:
► Select "Baseband > DVB-S".
This section provides an overview on the DVB-S / DVB-S2 settings.
The remote commands required to define these settings are described in Chapter 5,
"Remote-control commands", on page 43.
Settings:
● General settings......................................................................................................10
● Input signal settings.................................................................................................11
● Coding settings....................................................................................................... 21
● Special settings.......................................................................................................22
● Global connector settings........................................................................................23
● TS player.................................................................................................................24
● Local IP data network settings................................................................................ 33
DVB-S configuration and settings
General settings
3.1 General settings
Access:
► Select "Baseband > DVB-S".
The tab provides functionality for calling default settings, save and recall settings.
Settings:
State..............................................................................................................................10
Set To Default................................................................................................................11
Save/Recall................................................................................................................... 11
State
Activates the standard and deactivates all the other digital standards and digital modulation modes in the same path.
Remote command:
[:SOURce<hw>]:BB:DVBS:STATe on page 44
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Set To Default
Calls the default settings. The values of the main parameters are listed in the following
table.
Remote command:
[:SOURce<hw>]:BB:DVBS:PRESet on page 44
Save/Recall
Accesses the "Save/Recall" dialog, that is the standard instrument function for saving
and recalling the complete dialog-related settings in a file. The provided navigation
possibilities in the dialog are self-explanatory.
The settings are saved in a file with predefined extension. You can define the filename
and the directory, in that you want to save the file.
See also, chapter "File and Data Management" in the R&S SMCV100B user manual.
DVB-S configuration and settings
Input signal settings
Parameter Value
State Not affected by the "Set to Default"
Remote command:
[:SOURce<hw>]:BB:DVBS:SETTing:CATalog? on page 45
[:SOURce<hw>]:BB:DVBS:SETTing:LOAD on page 45
[:SOURce<hw>]:BB:DVBS:SETTing:STORe on page 45
[:SOURce<hw>]:BB:DVBS:SETTing:DELete on page 45
3.2 Input signal settings
Access:
► Select "Baseband > DVB-S / DVB-S2 > Input Signal".
The dialog provides access to settings necessary to configure the input signal.
Input signal tasks
The settings allow you to perform the following tasks:
●
Selecting an MPEG TS source
●
Displaying information about the selected MPEG TS (e.g. data rate)
●
Configuring the internal MPEG TS test packets or internal IP test packets
How to: Chapter 4.1, "Configuring the input signal", on page 36.
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Common input signal settings
The setting of the following parameters is used for all broadcast standards.
●
●
●
Settings:
● General settings......................................................................................................12
● Info.......................................................................................................................... 14
● Test signal settings..................................................................................................16
● IP channel x settings...............................................................................................17
3.2.1 General settings
DVB-S configuration and settings
Input signal settings
"Source"
"Input/Input Type"
"IP TS Channel"
Access:
► Select "Input Signal > General".
The tab provides general settings necessary to configure the input signal.
Settings:
Source...........................................................................................................................12
Input.............................................................................................................................. 13
Input Format..................................................................................................................13
IP TS Channel...............................................................................................................13
Stuffing.......................................................................................................................... 14
Test Signal.....................................................................................................................14
Source
Sets the modulation source for the input signal.
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DVB-S configuration and settings
Input signal settings
"External"
"TS Player"
"Test Signal"
Remote command:
[:SOURce<hw>]:BB:DVBS:SOURce on page 46
Input
Requires "Source > External".
Sets the external input interface.
"TS IN"
"IP"
Remote command:
[:SOURce<hw>]:BB:DVBS:INPut on page 46
Uses a transport stream, that is input at the "TS IN"/"IP Data" interface.
For more information about connecting to the interfaces, see also:
●
"TS IN" interface: Section "Configuring the Global Connectors" in
the R&S SMCV100B user manual.
●
"IP Data" interface: Chapter 3.7, "Local IP data network settings",
on page 33.
Uses an internal transport stream with TS packet data played from a
file. The player requires no option.
Playing encrypted files with extension _c requires a stream library
option R&S SMCVB-KSx.
See also:
●
Chapter 3.6, "TS player", on page 24
●
Supported TS player file types
Uses an internal test signal as specified in Chapter 3.2.3, "Test signal
settings", on page 16.
Input for serial transport stream data. The signal is input at the "User
1" connector.
Input for IP-based transport stream data (TSoverIP). The signal is
input at the "IP Data" connector.
Input Format
Requires "Input > TS IN".
Sets the format of the input signal.
"ASI"
"SMPTE 310"
Remote command:
[:SOURce<hw>]:BB:DVBS:INPut:FORMat on page 47
IP TS Channel
Requires "Input > IP".
Selects the IP-based transport stream (TS) channel. You can select 1 out of 4 IP TS
channels as input at the "IP Data" interface.
To configure a particular channel, see Chapter 3.2.4, "IP channel x settings",
on page 17.
Remote command:
[:SOURce<hw>]:BB:DVBS:INPut:TSCHannel on page 47
ASI format
SMPTE 310 format
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Stuffing
Requires "Source > External/TS Player".
Displays that stuffing is active.
Remote command:
[:SOURce<hw>]:BB:DVBS:STUFfing on page 47
Test Signal
Requires "Source > Test Signal".
Defines the test signal data.
The data consists of test TS packets.
"Test TS Packet"
"PRBS before Conv. Enc."
Remote command:
[:SOURce<hw>]:BB:DVBS:TESTsignal on page 51
DVB-S configuration and settings
Input signal settings
Standardized packet data used as modulation data in the transport
stream. To configure the packet structure, select the side tab "Test
Signal > Test TS Packet".
See also "Test TS Packet" on page 16.
Pure pseudo-random bit sequence (PRBS) data used as modulation
data with no packet structure. The sequence is inserted before the
convolutional encoder. PRBS data conforms with ITU-T O.151 specification.
To configure the PRBS type, select the side tab "Test Signal >
PRBS". See also "PRBS" on page 17.
3.2.2 Info
Access:
► Select "Input Signal > Info".
The tab displays the information on the input signal.
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Settings:
Packet Length............................................................................................................... 15
Max. Useful Data Rate.................................................................................................. 15
Measured Data Rate..................................................................................................... 15
Useful Data Rate...........................................................................................................15
Packet Length
Requires "Source > External".
Displays the packet length of the external transport stream in bytes.
If the packet length does not match the specified length, the output signal is erroneous.
"Packet Length > Invalid" is displayed.
"188"
"204"
"Invalid"
Remote command:
[:SOURce<hw>]:BB:DVBS:PACKetlength? on page 49
DVB-S configuration and settings
Input signal settings
188 byte packets specified for serial input ("Input > TS IN") and parallel input ("Input > IP").
204 byte packets specified for serial input ("Input > TS IN") and parallel input ("Input > IP").
Packet length does not match the specified length.
Max. Useful Data Rate
Requires "Source > External/TS Player".
Displays the maximum data rate, that is derived from the current modulation parameter
settings.
The value is the optimal value at the TS input interface, that is necessary for the modulator.
Remote command:
[:SOURce<hw>]:BB:DVBS:USEFul[:RATE]:MAX? on page 49
Measured Data Rate
Requires "Source > External".
Displays the measured value of the data rate r
●
External transport stream including null packets input at "User 1" connector
●
External transport stream including null packets input at "IP Data/LAN" connector
of one of the following:
meas
(TSoverIP)
The value r
r
= r
meas
useful
equals the sum of useful data rate r
meas
+ r
0
and the rate of null packets r0:
useful
Remote command:
[:SOURce<hw>]:BB:DVBS[:INPut]:DATarate? on page 50
Useful Data Rate
Requires "Source > External/TS Player".
Displays the data rate of useful data r
of the external transport stream. The data
useful
rate is measured at the input of the installed input interface.
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Remote command:
[:SOURce<hw>]:BB:DVBS:USEFul[:RATE]? on page 49
3.2.3 Test signal settings
Access:
► Select "Input Signal > Test Signal".
DVB-S configuration and settings
Input signal settings
The tab provides settings necessary to configure the input test signal.
Settings:
Test TS Packet.............................................................................................................. 16
PID Test Packet.............................................................................................................16
PID (Hex)...................................................................................................................... 17
Payload Test/Stuff......................................................................................................... 17
PRBS............................................................................................................................ 17
Test TS Packet
Specifies the structure of the test transport stream packet that is fed to the modulator.
"Head/184 Payload"
A sync byte (0x47) followed by three header bytes and 184 payload
bytes.
"Sync/187 Payload"
A sync byte (0x47) followed by 187 payload bytes.
Remote command:
[:SOURce<hw>]:BB:DVBS:TSPacket on page 51
PID Test Packet
If a header is present in the test packet ("Test TS Packet > Head/184 Payload"), you
can specify a fixed or variable packet identifier (PID).
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DVB-S configuration and settings
Input signal settings
"Null"
"Variable"
Remote command:
[:SOURce<hw>]:BB:DVBS:PIDTestpack on page 52
PID (Hex)
Sets the PID.
If "PID Test Packet > Null", "PID (Hex) = 1FFF" is fixed.
If "PID Test Packet > Variable", you can edit the value.
Remote command:
[:SOURce<hw>]:BB:DVBS:PID on page 52
Payload Test/Stuff.
Defines the payload area content of the TS packet.
You can select PRBS or exclusively data in hexadecimal format as payload.
For "Source > Test Signal", the packet is a test packet.
For "Stuffing > On", the packet is a null packet. Null packets are inserted into the external transport stream to adapt the stream data rate. See also "Measured Data Rate"
on page 15.
Remote command:
[:SOURce<hw>]:BB:DVBS:PAYLoad on page 52
The header of the test transport stream packets has a fixed setting of
null packet header 1FFF (hex).
Uses the header value defined with PID (Hex).
PRBS
Sets the length of the PRBS sequence.
You can select a PRBS 15 or a PRBS 23 sequence as specified by ITU-T O.151.
Remote command:
[:SOURce<hw>]:BB:DVBS:PRBS on page 52
3.2.4 IP channel x settings
Access:
1. Select "Input Signal > General".
2. Select "Source > External"
3. Select "Input > IP"
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4. Select "Input Signal > IP Channel x"
You can configure settings for 4 IP channels x = 1 to 4 individually, see also "Input
Signal > General > IP TS Channel".
DVB-S configuration and settings
Input signal settings
The tab provides settings to configure IP channel x.
IP channel settings affect input IP data of the local IP data network. The settings are
independent from the used broadcast standard configuration.
Saving/recalling a certain IP channel or local IP data network configuration is not possible via the broadcast standard-specific functionality.
Use the global save/recall functionality instead, see section "Saving and Recalling
Instrument Settings" in the R&S SMCV100B user manual.
The table below shows the availability of the tab in the broadcast standard configuration.
Table 3-1: IP channel configuration support in broadcast standards
Baseband standard "IP Channel x" Baseband standard "IP Channel x"
"ATSC/ATSC-M/H" Yes "DVB-S" Yes
"ATSC 3.0" No "DVB-S2" Yes
"DTMB" Yes "DVB-C" Yes
"DVB-T" Yes "J.83/B" Yes
"DVB-T2" Yes "DRM" No
"ISDB-T" Yes "Audio AM" No
"T-DMB/DAB" Yes "Audio FM" No
See also:
●
Chapter 4.1.1, "How to apply an external IP input signal", on page 36
●
Chapter 3.7, "Local IP data network settings", on page 33
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Requirements
At your IP source, set the "transport stream packets per internet protocol packet" (TP
per IP) parameter as follows:
●
●
We recommend that you use a separate LAN infrastructure to stream the transport
streams via IP to the IP connector of the baseband board. Also, avoid TS packet losses during IP transmission.
Settings:
Input IP..........................................................................................................................19
Alias.............................................................................................................................. 19
Type.............................................................................................................................. 19
Multicast Address..........................................................................................................19
Port................................................................................................................................20
IGMPv3 Source Address...............................................................................................20
Ping Source Address.................................................................................................... 20
Ping Result....................................................................................................................20
Local IP Data Network.................................................................................................. 20
DVB-S configuration and settings
Input signal settings
If TP packet length = 188 bytes: Set TP per IP to 7 or 6.
If TP packet length = 204/208 bytes: Set TP per IP to 6.
Input IP
Activates/deactivates the IP input.
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>[:STATe] on page 54
Alias
Sets a unique name for the IP connection.
The definition of a name is optional but facilitates identification in the measurement
views. The name input fits maximum 16 characters in ASCII format.
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:ALIas on page 54
Type
Sets the input signal type.
"Unicast"
"Multicast"
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:TYPE on page 54
Analyzes all unicast IP packets that arrive at the specified "Port".
When an IP address is in the multicast address range, an attempt is
made to join a multicast group using IGMP.
Set "Multicast Address" and "Port".
Multicast Address
Editing requires "Type > Multicast".
Sets the destination IP address (IPv4) of the IP connection.
You can set addresses from "224.0.0.0" to "239.255.255.255".
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Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:MULticast:ADDRess on page 55
Port
Sets the destination UDP port.
Due to UDP/RTP autosensing, we recommend that you set a port offset of at least 6
between neighboring IP TS channels.
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:PORT on page 54
IGMPv3 Source Address
Requires "Type > Multicast".
Sets the IGMPv3 source address.
If you need to filter the data sent to the multicast address, specify the source address.
A source address different from "0.0.0.0" accepts only data originating from the specified IP address.
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:IGMP[:SOURce]:ADDRess on page 55
DVB-S configuration and settings
Input signal settings
Ping Source Address
Clicking "Ping Source Address" triggers pinging of the IGMPv3 source address.
If you set a different value from "IGMPv3 Source Address = 0.0.0.0" and click the button, the software checks if the address is reachable.
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:IGMP[:SOURce]:PING on page 55
Ping Result
Displays the result after pinging the source address.
If "Ping Result > Ping: Successful", the source address is available in the network.
If "Ping Result > Ping: Transmit Failed. xxx", the source address is not available in the
network. "xxx" can be, e.g. "General Failure". Try another "IGMPv3 Source Address".
Remote command:
[:SOURce<hw>]:BB:INPut:IP<ch>:IGMP[:SOURce]:RESult? on page 55
Local IP Data Network
Accesses local IP data network settings, see Chapter 3.7, "Local IP data network set-
tings", on page 33.
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3.3 Coding settings
Access:
► Select "Baseband > DVB-S / DVB-S2 > Coding".
DVB-S configuration and settings
Coding settings
The tab provides settings for coding.
Settings:
Symbol Rate..................................................................................................................21
Constellation................................................................................................................. 21
Roll Off.......................................................................................................................... 21
Code Rate..................................................................................................................... 22
Symbol Rate
Sets the symbol rate.
In the transmission spectrum, the symbol rate represents the 3 dB bandwidth.
Remote command:
[:SOURce<hw>]:BB:DVBS:SYMBols on page 57
Constellation
Defines the constellation.
If the constellation is changed, the symbol rate is retained. The required transport
stream input data rate changes, keeping the necessary channel bandwidth constant.
Different code rates are possible in the different constellations.
Remote command:
[:SOURce<hw>]:BB:DVBS:CONStel on page 56
Roll Off
Sets the roll-off alpha factor value.
The specification of DVB-S defines a roll-off alpha factor of 0.35. The specification of
DVB-DSNG defines a roll-off alpha factor of 0.25 or 0.35.
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A smaller alpha value produces a steeper drop of the modulation spectrum but the
stopband attenuation is lower. A larger alpha value produces a flatter drop of the modulation spectrum. The spectrum is wider but the stopband attenuation is higher.
The 3 dB point of the modulation spectrum is the same for all alpha values. The output
signals are pulse-shaped by an FIR filter, yielding a root raised cosine characteristic.
Remote command:
[:SOURce<hw>]:BB:DVBS:ROLLoff on page 57
Code Rate
Sets the code rate.
The available code rates depend on constellation, see the table below. If you change
the constellation and the previously set code rate is not available in the new constellation, an available code rate is automatically selected.
DVB-S configuration and settings
Special settings
Constellation Available code rate
QPSK 1/2, 2/3, 3/4, 5/6, 7/8
8PSK 2/3, 5/6, 8/9
16QAM 3/4, 7/8
Remote command:
[:SOURce<hw>]:BB:DVBS:RATE on page 57
3.4 Special settings
Access:
► Select "Baseband > DVB-S / DVB-S2 > Special".
The tab provides settings, that differ from the specification of the broadcast standard.
The tab provides settings, that differ from the specification of the broadcast standard.
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R&S®SMCVB-K167
Settings:
Special Settings............................................................................................................ 23
Reed Solomon.............................................................................................................. 23
Special Settings
Enables/disables special settings.
The setting allows you to switch between standard-compliant and user-defined channel
coding.
Remote command:
[:SOURce<hw>]:BB:DVBS[:SPECial]:SETTing[:STATe] on page 58
Reed Solomon
Enables/disables the Reed-Solomon encoder.
Normally, the incoming packet length of a transport stream frame is 188 bytes. In special cases, a length of 204 bytes is possible.
The behavior depends on the "Packet Length":
●
●
Remote command:
[:SOURce<hw>]:BB:DVBS[:SPECial]:REEDsolomon on page 58
DVB-S configuration and settings
Global connector settings
"On"
If "Packet Length" = 188: The Reed-Solomon encoder adds 16 Reed-Solomon
bytes to the incoming 188 bytes of an MPEG transport stream frame. The ReedSolomon decoder can then correct up to 8 errored bytes in a Reed-Solomon
packet (= 204 bytes). The number of incorrect bits in an errored byte is irrelevant.
If "Packet Length" = 204: Of the incoming 204 bytes of an MPEG transport stream
frame, the Reed-Solomon encoder overwrites the last 16 bytes with its own ReedSolomon bytes.
Default state.
"Off"
If "Packet Length" = 188: 16 dummy bytes are transmitted instead of the 16 ReedSolomon bytes. The data rate is not changed.
If "Packet Length" = 204: All 204 bytes of an MPEG frame are transmitted
unchanged. The data rate is not changed.
3.5 Global connector settings
The "Input Signal" dialog, the "Trigger/Marker/Clock" dialog and "Trigger In", "Marker"
and "Clock" tabs in "Baseband > ARB/Custom Digital Mod" configuration dialogs provide quick access to the related connector settings. Click the "Global Connectors" button to access the settings.
See also chapter "Global connector settings" in the user manual.
23User Manual 1179.1058.02 ─ 04
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