MMDS can transparently transmit services. The interfaces between the base station and the network are Tl/El, 100Base-T, and O-3. The interfaces on the user end are El and 10Base-T, which can provide users with Internet access and local users. Data exchange, voice services and VOD video on demand services. MMDS is mainly concentrated in 2GHz~5GHz. Relatively speaking, the resource ratio of this band more intense, countries can allocate more to MMDS than LMDS. Since the 2GHz~5GHz frequency band is less affected by rain attenuation, and the space transmission loss is lower than LMDS under the same conditions, the MMDS frequency band can be applied to a wide coverage with a radius of several tens of kilometers.