R

Rain Margin
The additional power included in the link budget to take account of attenuation and increased noise introduced by atmospheric water. The margin is lowest for C band, higher for Ku band and highest for Ka band because of the increased effect the water has at higher frequencies.

Receiver
Device that converts the signal from the satellite into a form suitable to be sent to the modem for de-modulation.

RFI
Radio Frequency Interference

Router
A device to connect IP and other subnets