SFN Adapter
SFN-D140V1 can enhance coverage and spectrum utilization in a Single Frequency Network (SFN) by synchronizing cells both in time and frequency terms. These profits are achieaved by inserting functions and parameters such as Time and Frequency references.
The SFN-D1401 receives a 1PPS time reference and a 10MHz clock reference from GPS receiver and computes time and
transmitter configuration information such as power and signal processing parameters to build the Mega frame Initialization Packet (MIP) inserted into the
MPEG-2 transport stream. Also, the MIP block restamps the Program Clock Reference (PCR) information of each program and adapts bit rate of all
transmitters in the network.
Applications
SFN-D140V1 is used for synchronization of single frequency networks in Digital Video
Broadcasting Terrestrial (
DVB-T) and Digital Video
Broadcasting handheld (
DVB-H) systems.
In a single frequency network, all
transmitters
broadcast the same data at the same frequency band and time. In fact,
transmitters adjust their time, frequency, power, and other operational modes by evaluating the parameters inserted in MIP packets and time and frequency references received from an external GPS receiver. SFN-D140V1 is compatible with EN 300 744, TS 101 191, and TR 101 290 precisely.
Benefits
- Bit rate adaptation and PCR restamping.
- Two ASI input/output for redundancy operation.
- SPI input/output for parallel data.
- Remote control with RS-232/RS-485 and SNMP protocol via Ethernet.
- Compliance with EN300744 and TR101191 standards.
Interface
- Input
MPEG-2 Transport Stream
- DVB-ASI (LP&HP)(Connector: BNC 75Ω)
- DVB-SPI(Connector: D-25LVDS)
SFN Synchronization
- 10MHz IN(Connector: BNC 50Ω)
- 1 PPS Pulses(Connector: BNC 50Ω)
- Output
MPEG-2 Transport Stream
- DVB-ASI (LP&HP)(Connector: BNC 75Ω)
- DVB-SPI(Connector: D-25LVDS)
- Control Interface
RS-485 (Connector: D-Type 9 pins)
RS232 (Connector: D-Type 9 pins)
SNMP Ethernet: 10/100 Base-T (Connector: RJ45)
- Main Power
Voltage: 85-264V
Power: Max 60W
Technical Data
INPUTS
MPEG-2 Transport Stream(2xASI, BNC 75 ohm)
MPEG-2 Transport Stream(SPI inputs, Parallel data input)
| Packet Length |
188/204 bytes |
| Packet Modes |
Burst/Byte |
Clock Reference:
| Connector |
BNC |
| Frequency |
10MHz±2ppm |
| Level |
100mV~3V PP |
| Impedance |
50 ohm, AC coupled |
OUTPUTS
MPEG-2 Transport Stream(2xASI, BNC 75 ohm)
MPEG-2 Transport Stream(SPI inputs, Parallel data output)
Signal Processing
| Supported Modes IFFT |
2K, 4K, 8K |
| Guard Intervals |
1/4, 1/8, 1/16, 1/32 |
| Code Rates |
1/2, 2/3, 3/4, 5/6, 7/8 |
| Constellations |
QPSK, 16-QAM, 64-QAM |
| Hierarchical Mode |
HP or LP streams supported |
| Max Delay |
0-1.000 sec, resolution 100 ns |
| Null and MIP Packet insertion in case of input data loss |
Standards
Compliant with
DVB standards
Control and Monitoring
Remote Interface: RS-232, RS-485, SNMP
Download PDF