Editing Satellite Internet access (section)

====Indoor unit (IDU)====
The satellite [[modem]] serves as an interface between the outdoor unit and customer-provided equipment (i.e. PC, router) and controls satellite transmission and reception. From the sending device (computer, router, etc.) it receives an input [[bitstream]] and converts or modulates it into radio waves, reversing that order for incoming transmissions, which is called [[demodulation]]. It provides two types of connectivity:
* Coaxial cable (COAX) connectivity to the satellite antenna. The cable carrying electromagnetic satellite signals between the modem and the antenna generally is limited to be no more than 150 feet in length.
* [[Ethernet]] connectivity to the computer, carrying the customer's data packets to and from the Internet content servers.
Consumer grade satellite modems typically employ either the [[DOCSIS]] or [[WiMAX]] telecommunication standard to communicate with the assigned gateway.