The AHA4709E2IQ is a highly integrated solution for DVB-S2X spanning from Ethernet GMII interface to DAC and ADC interfaces. The highly integrated architecture allows efficient networking and transport over satellite links while supporting a wide range of applications and network topologies. When combined with an RF front end, a complete modem solution is easily implemented. DVB-S2X assures backwards compatibility with DVB-S2 and DVB-S signals.
Both Adaptive Coding and Modulation (ACM) and Constant Coding and Modulation (CCM) are supported. ACM allows optimization of throughput under varying link conditions. CCM allows operators to define groups of remotes having different modulation and coding parameters, as a means to improve efficiency on existing satellite capacity.
On the Transmit side:
Transmit data from the Ethernet GMII interface is encapsulated by a Generic Stream Encapsulation (GSE) module, the Baseband header is added and the baseband frame is padded and scrambled. Next the frame is encoded with AHA’s DVB-S2X FEC encoder (AHA4709E), formed into symbols, physical layer framed and then modulated into I and Q symbol values to be sent to the D/A converter.
On the Receive side:
Signals from the channel are passed in from the RF front end by an A/D Converter and recovered by a DVB‐S2X demodulator and deframed. Next the data is decoded with AHA’s high performance (implementation loss <0.1dB) DVB-S2X FEC Decoder (AHA4709D), the baseband frames are removed, and the data is decapsulated (GSE) to extract the Ethernet frames before being sent out the Rx side of the GMII interface. The receiver automatically detects for pilots ON/OFF, supports spectral roll off of 5%, 10%, 15%, 20%, 25% or 35%, and detects spectral inversion.
The AHA4709E2IQ includes test modes and loopbacks for rapid verification of the correct functioning of the device.
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