Models: DVS 4010E
Features
· DVB-T, DVB-H and DTMB modes of operation
· 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
· Supports HP or LP streams for hierarchical mode
Overview
For the operation of digital terrestrial TV networks, DVB-T/H or DTMB (software selectable), where several transmitters broadcast the same programs on the same RF channel frequencies (Single Frequency Networks), the transmitters require precise frequency and time synchronization. The frequency (10 MHz) and time (1 pps) reference signals can be easily obtained from a GPS receiver at each transmission site.
The UBS DVS 4010E SFN Adapter fulfils the task of inserting “synchronization marks” in a DVB or DTMB transport stream (MIP or SIP insertion) in full accordance with DVB-T/H and DTMB standards.
The basic functions performed by the DVS 4010E SFN adapter are:
· Inserts a megaframe initialization packet (MIP or SIP) 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
Compliant with DVB standards: EN 300 744 and TS 101 191
Compliant with DTMB standards: GB20600-2006,
GY/T 229.1-2008
MIP Insertion (DVB-T/H or DTMB mode)
MIP insertion occurs once per megaframe, with a time interval dependent on the selected guard interval.
The MIP indicates when the first packet in a mega-frame (Synchronization Time Stamp, STS) begins transmitting.
The time reference is an external 1 pulse per second signal, easily obtained from a GPS receiver.
SIP Insertion (DTMB mode only)
SIP insertion occurs once per second and is synchronized with the 1PPS signal from a GPS receiver. The SIP contains the transmission parameters for the modulator and the SFN maximum delay.
Bitrate Adaptation
The DVS 4010E is provided with two serial (ASI) inputs that accept an MPEG transport stream according to DVB recommendations (188 or 204 byte packets). The output may be configured as either 188 or 204 byte packets, however, for 204 byte packets, there is no RS encoding and the last 16 bytes are dummy bytes. In DTMB mode, only 188 byte packets are supported.
Note: the maximum bitrate has to include the inserted MIP or SIP, which means the input net bitrate must be slightly lower than the maximum.
The SFN Adapter removes null packets from the input signal and inserts MIP or SIP packets. New null packets are then added to produce a precise output bitrate, which is required for the selected transmission mode (dependent on code rate, constellation and guard band). The maximum allowable net bitrate is governed by the selected transmission mode. As the transport rate is modified, the SFN adaptor performs PCR re-stamping.
Control
The DVS 4010E is controlled 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 ETSI or DTMB standards, may be set from the remote interface.
An Ethernet (10/100 Base-T) interface is also available for remote control and remote software upgrade.
Features
· DVB-T, DVB-H and DTMB modes of operation
· 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
· Supports HP or LP streams for hierarchical mode
Overview
For the operation of digital terrestrial TV networks, DVB-T/H or DTMB (software selectable), where several transmitters broadcast the same programs on the same RF channel frequencies (Single Frequency Networks), the transmitters require precise frequency and time synchronization. The frequency (10 MHz) and time (1 pps) reference signals can be easily obtained from a GPS receiver at each transmission site.
The UBS DVS 4010E SFN Adapter fulfils the task of inserting “synchronization marks” in a DVB or DTMB transport stream (MIP or SIP insertion) in full accordance with DVB-T/H and DTMB standards.
The basic functions performed by the DVS 4010E SFN adapter are:
· Inserts a megaframe initialization packet (MIP or SIP) 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
Compliant with DVB standards: EN 300 744 and TS 101 191
Compliant with DTMB standards: GB20600-2006,
GY/T 229.1-2008
MIP Insertion (DVB-T/H or DTMB mode)
MIP insertion occurs once per megaframe, with a time interval dependent on the selected guard interval.
The MIP indicates when the first packet in a mega-frame (Synchronization Time Stamp, STS) begins transmitting.
The time reference is an external 1 pulse per second signal, easily obtained from a GPS receiver.
SIP Insertion (DTMB mode only)
SIP insertion occurs once per second and is synchronized with the 1PPS signal from a GPS receiver. The SIP contains the transmission parameters for the modulator and the SFN maximum delay.
Bitrate Adaptation
The DVS 4010E is provided with two serial (ASI) inputs that accept an MPEG transport stream according to DVB recommendations (188 or 204 byte packets). The output may be configured as either 188 or 204 byte packets, however, for 204 byte packets, there is no RS encoding and the last 16 bytes are dummy bytes. In DTMB mode, only 188 byte packets are supported.
Note: the maximum bitrate has to include the inserted MIP or SIP, which means the input net bitrate must be slightly lower than the maximum.
The SFN Adapter removes null packets from the input signal and inserts MIP or SIP packets. New null packets are then added to produce a precise output bitrate, which is required for the selected transmission mode (dependent on code rate, constellation and guard band). The maximum allowable net bitrate is governed by the selected transmission mode. As the transport rate is modified, the SFN adaptor performs PCR re-stamping.
Control
The DVS 4010E is controlled 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 ETSI or DTMB standards, may be set from the remote interface.
An Ethernet (10/100 Base-T) interface is also available for remote control and remote software upgrade.
Multi Standard Adapter
DVB Products
mobile and terrestrial digital broadcasting
