DVB-T / DVB-H Modulator
Model: DVM 5000L
Modulator Features
· L-Band RF Output
· Full hierarchical mode support
· SFN and MFN support
· Superior MER performance
· Near seamless switching between inputs
· Linear and Non-Linear Digital Precorrection
· Web GUI, SNMP and Telnet remote control and software upgrade
· Full DVB-H Support
Modulator Overview
Designed to meet the most demanding requirements of today’s Digital Terrestrial Television Broadcast Market, the DVM 5000L from UBS is ranked number one in its class. A key factor in the product’s success is the quality of its coding and modulation process.
Modulator Application
The performance and flexibility of the DVM 5000L allows it to excel in any application related to DVB-T/H modulation. The core function of the DVM 5000L is to modulate a MPEG-2 transport stream (input) onto an DVB-T/H compliant OFDM spectrum (output) in accordance with the rules for channel coding and modulation specified in the DVB-T and/or the DVB-H ETSI standards (EN 300 744 and/or ETSI EN 302 304).
Modulator Inputs
The DVM 5000L has two MPEG-2 inputs (ASI format)), which can be automatically selected, or assigned by the user. The automatic switching provides near seamless switching to a secondary transport stream in case the primary transport stream source fails (a truly valuable feature for broadcast applications).
Modulator RF Output
The DVM 5000L delivers the COFDM spectrum on a user defined L-Band frequency from 1665 MHz to 1680 MHz, in steps of just 1 Hz. The output level is adjustable from -10 dBm to 0 dBm with a step size of 0.2 dB. The user can set the polarity of the spectrum to Inverted or Non-inverted as required. The spectrum bandwidth may be user configured to 8, 7, 6 or 5 MHz as required.
Modulator IF Output
The DVM 5000L has an IF output, where the same COFDM signal is available at 36 MHz (default), or at a user defined frequency between 35 MHz and 48 MHz. The IF output can be directly interfaced to a wide range of transmitters and frequency converters.
Optional Product Features
Modulator DVB-H Mode
This option allows the DVM 5000L to generate a DVB-H waveform in accordance with the ETSI DVB-H standards.
Modulator SFN Mode
This option provides the DVM 5000L with market leading SFN performance, with respect to basic timing accuracy and the extent of the local delay offset range. The user can select either the SFN or MFN mode via the control interfaces.
The ability to select MFN mode is a convenient feature when conducting pre-tests and alignment of RF parameters on transmitter installations before the timing references and transport stream with MIP are in place (as a general rule, SFN modulators must mute their output if either of these signals is absent).
Modulator's Hierarchical Modulation
Hierarchical modulation allows simultaneous transmission of two MPEG-2 transport streams. The compromise between data rate and ruggedness can be set differently between the two virtual channels. For example:
• Highly protected channel (High Priority - HP- input) for transmission to mobile and/or portable receivers and
• High capacity channel (Low Priority - LP - input), at the expense of ruggedness, for transmission to rooftop antennas.
This option can be used to provide two services simultaneously: DVB-H and DVB-T, where the DVB-H service is provided via the HP channel, while the DVB-T service is provided via the LP channel. Another typical application is simulcasting the same program in high definition resolution and standard definition resolution.
A significant benefit of hierarchical modulation is that the total data-rate available in a system with two hierarchically modulated RF channels is greater than what is available in a two-channel, non-hierarchical system, where one RF channel is strictly dedicated for transmission to mobile/portable receivers and the other RF channel is strictly dedicated for transmission to rooftop antennas.
6 MHz Bandwidth
In addition to the standard 8 MHz and 7 MHz BW, the DVM 5000L will also support transmission with a 6 MHz bandwidth that is intended for applications in North and South America, Korea, Japan and elsewhere, where the 6 MHz channel raster is standard.
5 MHz Bandwidth
The DVM 5000L will also support transmission with a 5 MHz BW, recommended when the DVM 5000L operates in the DVB-H mode. This option is highly attractive for T&M and R&D applications as the user can simply switch between the four bandwidths via the instrument front panel (one instrument covers all bandwidths defined by the ETSI for DVB-T and/or DVB-H transmission).
Modulator Web Interface
This feature allows remote control of the DVM 5000L via Ethernet (TCP/IP). The system is based on a Web server mounted inside the DVM 5000L. The Web pages stored on the Web server are designed as a complete graphical user interface (GUI) for testing the status and setting the parameters of the modulator. The Web Interface concept is popular because remote control with this system only requires a standard PC with a network interface card (NIC) and a Web browser (Microsoft Explorer 6.0+).
SNMP client
This feature allows remote control of the DVM 5000L in accordance with the SNMP protocol (Get, Set and SNMP traps). This remote control feature is intended for systems solutions where it is desired to integrate the control of a range of SNMP compliant equipment in a common management system.
Digital Linear and Non-linear Pre-corrector
This is recommended in order to maximize the performance of the transmitter in which the modulator is installed.
• The Non-linear Pre-corrector balances out gain and phase non-linearity in the transmitter RF power amplifier,
thereby significantly reducing the in-band and out of band intermodulation products. Optimizing the transmitter’s
performance will extend the coverage area. The performance requirement of the transmitter output filter, which is
used to suppress radiation in adjacent channels below a maximum allowed level, will also be eased.
• The Linear Pre-corrector balances out level and group delay variations that are seen across the channel bandwidth
and are caused by the transmitter mask filter and/or channel combiner filters. The linear optimization of the
transmitter’s radiated signal allows the ISDBT receiver’s channel equalizer to focus all of its correction capacity on
level and group delay errors originating from the actual transmission path.
The characteristics of the linear and non-linear pre-correction curves are set by means of an easy to use and highly intuitive graphical user interface, the UBS Corrector GUI software package (Windows compatible).
Null Eliminator Option (patented)
This option allows the network designer to shift the stationary nulls in a typical DVB-H SFN environment, to eliminate dead reception areas.
GPS Elimination Software Option (patented)
For large network deployments.
Transmitter Control Option
This option allows the control of the Transmitter output power, with a closed loop power control mechanism.
Modulator Features
· L-Band RF Output
· Full hierarchical mode support
· SFN and MFN support
· Superior MER performance
· Near seamless switching between inputs
· Linear and Non-Linear Digital Precorrection
· Web GUI, SNMP and Telnet remote control and software upgrade
· Full DVB-H Support
Modulator Overview
Designed to meet the most demanding requirements of today’s Digital Terrestrial Television Broadcast Market, the DVM 5000L from UBS is ranked number one in its class. A key factor in the product’s success is the quality of its coding and modulation process.
Modulator Application
The performance and flexibility of the DVM 5000L allows it to excel in any application related to DVB-T/H modulation. The core function of the DVM 5000L is to modulate a MPEG-2 transport stream (input) onto an DVB-T/H compliant OFDM spectrum (output) in accordance with the rules for channel coding and modulation specified in the DVB-T and/or the DVB-H ETSI standards (EN 300 744 and/or ETSI EN 302 304).
Modulator Inputs
The DVM 5000L has two MPEG-2 inputs (ASI format)), which can be automatically selected, or assigned by the user. The automatic switching provides near seamless switching to a secondary transport stream in case the primary transport stream source fails (a truly valuable feature for broadcast applications).
Modulator RF Output
The DVM 5000L delivers the COFDM spectrum on a user defined L-Band frequency from 1665 MHz to 1680 MHz, in steps of just 1 Hz. The output level is adjustable from -10 dBm to 0 dBm with a step size of 0.2 dB. The user can set the polarity of the spectrum to Inverted or Non-inverted as required. The spectrum bandwidth may be user configured to 8, 7, 6 or 5 MHz as required.
Modulator IF Output
The DVM 5000L has an IF output, where the same COFDM signal is available at 36 MHz (default), or at a user defined frequency between 35 MHz and 48 MHz. The IF output can be directly interfaced to a wide range of transmitters and frequency converters.
Optional Product Features
Modulator DVB-H Mode
This option allows the DVM 5000L to generate a DVB-H waveform in accordance with the ETSI DVB-H standards.
Modulator SFN Mode
This option provides the DVM 5000L with market leading SFN performance, with respect to basic timing accuracy and the extent of the local delay offset range. The user can select either the SFN or MFN mode via the control interfaces.
The ability to select MFN mode is a convenient feature when conducting pre-tests and alignment of RF parameters on transmitter installations before the timing references and transport stream with MIP are in place (as a general rule, SFN modulators must mute their output if either of these signals is absent).
Modulator's Hierarchical Modulation
Hierarchical modulation allows simultaneous transmission of two MPEG-2 transport streams. The compromise between data rate and ruggedness can be set differently between the two virtual channels. For example:
• Highly protected channel (High Priority - HP- input) for transmission to mobile and/or portable receivers and
• High capacity channel (Low Priority - LP - input), at the expense of ruggedness, for transmission to rooftop antennas.
This option can be used to provide two services simultaneously: DVB-H and DVB-T, where the DVB-H service is provided via the HP channel, while the DVB-T service is provided via the LP channel. Another typical application is simulcasting the same program in high definition resolution and standard definition resolution.
A significant benefit of hierarchical modulation is that the total data-rate available in a system with two hierarchically modulated RF channels is greater than what is available in a two-channel, non-hierarchical system, where one RF channel is strictly dedicated for transmission to mobile/portable receivers and the other RF channel is strictly dedicated for transmission to rooftop antennas.
6 MHz Bandwidth
In addition to the standard 8 MHz and 7 MHz BW, the DVM 5000L will also support transmission with a 6 MHz bandwidth that is intended for applications in North and South America, Korea, Japan and elsewhere, where the 6 MHz channel raster is standard.
5 MHz Bandwidth
The DVM 5000L will also support transmission with a 5 MHz BW, recommended when the DVM 5000L operates in the DVB-H mode. This option is highly attractive for T&M and R&D applications as the user can simply switch between the four bandwidths via the instrument front panel (one instrument covers all bandwidths defined by the ETSI for DVB-T and/or DVB-H transmission).
Modulator Web Interface
This feature allows remote control of the DVM 5000L via Ethernet (TCP/IP). The system is based on a Web server mounted inside the DVM 5000L. The Web pages stored on the Web server are designed as a complete graphical user interface (GUI) for testing the status and setting the parameters of the modulator. The Web Interface concept is popular because remote control with this system only requires a standard PC with a network interface card (NIC) and a Web browser (Microsoft Explorer 6.0+).
SNMP client
This feature allows remote control of the DVM 5000L in accordance with the SNMP protocol (Get, Set and SNMP traps). This remote control feature is intended for systems solutions where it is desired to integrate the control of a range of SNMP compliant equipment in a common management system.
Digital Linear and Non-linear Pre-corrector
This is recommended in order to maximize the performance of the transmitter in which the modulator is installed.
• The Non-linear Pre-corrector balances out gain and phase non-linearity in the transmitter RF power amplifier,
thereby significantly reducing the in-band and out of band intermodulation products. Optimizing the transmitter’s
performance will extend the coverage area. The performance requirement of the transmitter output filter, which is
used to suppress radiation in adjacent channels below a maximum allowed level, will also be eased.
• The Linear Pre-corrector balances out level and group delay variations that are seen across the channel bandwidth
and are caused by the transmitter mask filter and/or channel combiner filters. The linear optimization of the
transmitter’s radiated signal allows the ISDBT receiver’s channel equalizer to focus all of its correction capacity on
level and group delay errors originating from the actual transmission path.
The characteristics of the linear and non-linear pre-correction curves are set by means of an easy to use and highly intuitive graphical user interface, the UBS Corrector GUI software package (Windows compatible).
Null Eliminator Option (patented)
This option allows the network designer to shift the stationary nulls in a typical DVB-H SFN environment, to eliminate dead reception areas.
GPS Elimination Software Option (patented)
For large network deployments.
Transmitter Control Option
This option allows the control of the Transmitter output power, with a closed loop power control mechanism.
Models: DTMB 4010
Features
· SFN time and frequency synchronization
· Serial ASI selectable inputs and outputs
· Bit rates adjusted with transmission mode
· Rear panel monitoring points for TS output and sync output
Overview
For the operation of digital terrestrial TV networks, DTMB, where several transmitters broadcast the same programs on the same channel frequencies - Single Frequency Networks - the transmitters require precise time and frequency synchronization. Both the frequency reference (10 MHz) and the time reference (1 pps) signals can easily be obtained from the GPS system at all transmitter sites. The UBS DTMB 4010 SFN Adapter fulfils the task of inserting “synchronization marks” in a DVB transport stream (MIP insertion) in full accordance with DTMB standards.
The basic functions performed by the DTMB 4010 SFN adapter are:
· Inserts a megaframe initialization packet (MIP) into an MPEG transport stream
· Adjusts the bitrate of the transport stream to be synchronous with an external reference
and in accordance with the chosen COFDM transmission mode
· Provides signaling/mode data for the control of individual transmitter modulators
MIP insertion
The MIP insertion occurs once per megaframe, with a time interval dependent on the chosen guard band. The MIP indicates the start of the transmission of the first packet in a mega-frame (Synchronization Time Stamp, STS). The time reference is an external 1 pulse per second signal, easily available from a GPS.
Bitrate Adaptation
The DTMB 4010 is provided with two serial (ASI) inputs. The input circuits accept an MPEG transport stream according to the DTMB recommendations (188 byte packets). The output is also 188 byte packets. Note: the maximum bit rate has to include the inserted MIP, which means that the input net bit rate must be slightly lower than maximum. The SFN Adapter removes the null packets in the input signal and inserts the MIP packets. New null packets are then added, to produce an output bit rate, which is precisely the required bit rate for the chosen transmission mode i.e. dependent on code rate, constellation and guard band. The maximum net allowable bit rate is governed by the intended transmission mode, according to the DTMB standards. As the transport rate is modified, the SFN adaptor performs PCR re-stamping.
Control
The operation of the DTMB 4010 is controlled either locally, with a display and push-buttons, or remotely, using the serial RS232 and/or RS485 ports. All mandatory system parameters, as defined in the DTMB standards, may be set from the remote interface. An Ethernet (10/100 BaseT) interface is also available, for remote control and remote software upgrade.
Alarms
One alarm circuit is provided. It may be "armed" for a number of conditions important for correct operation. The Alarm output is via floating contacts on the rear panel and the alarm information is also available via the remote control.
Features
· SFN time and frequency synchronization
· Serial ASI selectable inputs and outputs
· Bit rates adjusted with transmission mode
· Rear panel monitoring points for TS output and sync output
Overview
For the operation of digital terrestrial TV networks, DTMB, where several transmitters broadcast the same programs on the same channel frequencies - Single Frequency Networks - the transmitters require precise time and frequency synchronization. Both the frequency reference (10 MHz) and the time reference (1 pps) signals can easily be obtained from the GPS system at all transmitter sites. The UBS DTMB 4010 SFN Adapter fulfils the task of inserting “synchronization marks” in a DVB transport stream (MIP insertion) in full accordance with DTMB standards.
The basic functions performed by the DTMB 4010 SFN adapter are:
· Inserts a megaframe initialization packet (MIP) into an MPEG transport stream
· Adjusts the bitrate of the transport stream to be synchronous with an external reference
and in accordance with the chosen COFDM transmission mode
· Provides signaling/mode data for the control of individual transmitter modulators
MIP insertion
The MIP insertion occurs once per megaframe, with a time interval dependent on the chosen guard band. The MIP indicates the start of the transmission of the first packet in a mega-frame (Synchronization Time Stamp, STS). The time reference is an external 1 pulse per second signal, easily available from a GPS.
Bitrate Adaptation
The DTMB 4010 is provided with two serial (ASI) inputs. The input circuits accept an MPEG transport stream according to the DTMB recommendations (188 byte packets). The output is also 188 byte packets. Note: the maximum bit rate has to include the inserted MIP, which means that the input net bit rate must be slightly lower than maximum. The SFN Adapter removes the null packets in the input signal and inserts the MIP packets. New null packets are then added, to produce an output bit rate, which is precisely the required bit rate for the chosen transmission mode i.e. dependent on code rate, constellation and guard band. The maximum net allowable bit rate is governed by the intended transmission mode, according to the DTMB standards. As the transport rate is modified, the SFN adaptor performs PCR re-stamping.
Control
The operation of the DTMB 4010 is controlled either locally, with a display and push-buttons, or remotely, using the serial RS232 and/or RS485 ports. All mandatory system parameters, as defined in the DTMB standards, may be set from the remote interface. An Ethernet (10/100 BaseT) interface is also available, for remote control and remote software upgrade.
Alarms
One alarm circuit is provided. It may be "armed" for a number of conditions important for correct operation. The Alarm output is via floating contacts on the rear panel and the alarm information is also available via the remote control.
DTMB SFN Adapter
DVB Products
mobile and terrestrial digital broadcasting
DVB Products
mobile and terrestrial digital broadcasting