A satellite communication modem is instrumental in transferring data using relay link via communications satellite. The Satcom Modem technologies support BPSK/QPSK/16-QAM/8-PSK modulations and coding. These modems have advanced tracking systems. Additionally, without any need of terrestrial infrastructure, these Satcom modems provide the cable-internet data rate connections.
Properties of Satcom Modems
Depending on the parameters and satellite link of any system, the modem can provide outbound link more than 20mbits/sec to each terminal and upto 5mbit/s to the inbound link. As far as the satellite, it is able to match the terrestrial competition of DSL or cables services byproviding what customers would expect from the broadband services. It is a more advanced technology than previously used.
The new modem derives many if its features from the ARTES and TRP including higher modulation, advanced Forward Error Correction Schemes, IP friendly link layer encapsulation, and in-out bound modulation and coding techniques.
Modes of Modem
These include Continuous mode & Burst mode.
Incontinuous mode, the modulator-input, which is a sampled data on the falling edge, transmits clock-demodulator output updated on the falling edge of the data received clock. The FSYNC-modified buffer cache at modulator input should be open.
In burst mode modulation, as far as the phase relation between MCLK and data are same, FSYNC provides the start of burst information and the word synchronization. At input-output of the demodulator, the FSYNC signal remains inactive immediately after the power-on during the burst interval.
A DVB-S2 modulator supports the Satcom Modulation technique. Besides, it is available in IF and L-band operations between 50 Kbaud -133 Mbaud at data rate up to 425Mbits/sec. These products are useful in wide range of applications combined with GbE and ASI inputs, and embedded IP encapsulation.