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Specialized Modem
The modem is developed to provide secure and reliable communication over long distances (12 km) between modules INMOD and a concentrator to a concentrator or a computer. Aiming more reliable and secure communication, not amplitude modulation, but modified frequency modulation of the signal is used. This leads to greater bandwidth of the channel (7.2 kHz). Because of this, a direct phone line is used. Aiming a more reliable and secure connection when a party line-telephone is used, two phone lines are necessary for the two directions of the connection. The maximum speed of data over the channel is up to 4800bps.