L band is a fequency range between 390MHz and 1.55GHz which is used for satellite communications and for terrestrial communications between satellite equipment.
The high frequencies utilized by C band, Ku band, and Ka band would suffer from high signal loss when transported over a copper coax cable such as an Intra-Facility Link.
An LNB is used to convert these higher frequency bands to L band, which can be transmitted over the IFL and processed by the IDU.
Some satellites transmit on L band, such as GPS satellites.
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