A satellite modem is a communication device that is used to transmit and receive signals between a satellite and a ground station. It is primarily used for modulation and demodulation of signals. During signal transmission, the modem converts a digital signal into an analog signal (modulation) and is fed to a filter, upconverter, amplifier, and transmitter antenna. In the receiving process, the modem receives analog signals from the satellite through a filter, low-noise block (LNB), and downconverter. Then it converts the analog signal back into a digital signal (demodulation).

A satellite modem typically consists of a modulator, upconverter, amplifier, LNB, downconverter, demodulator, filters, and antenna. It supports various frequency bands, data rates, modulation types (BPSK, QPSK/OQPSK, 8PSK, 8-QAM, 8-ARY), and data interfaces (USB-C, RS-232, RS-485, SNMP). Satellite modem is ideal for mobile backhaul, G.703 Trunking, IP trunking, satellite news gathering, offshore & and maritime communications, enterprise, and maritime applications.