Base station
DOWNSTREAMThe multipoint transmitter receives the signal from the AIR main station on the interfrequency. The signal is then converted to high TX frequency (Downstream transmission frequency) filtered and amplified. The bandwidth of the frequency is the same as the bandwidth received from main station. The Downstream transmission frequency is then transmitted through the antenna with a typical gain of 10 dB (depending on the frequency and antenna system – Omni directional, sectorized).
UPSTREAM
The multipoint receiver receives and down converts the high frequency signal (upstream receiving frequency), filters and amplifies it and then sends it to the AIR Wireless internet transport system which is connected to a CMTS. If needed, the signal can be also transmitted from the base station to the CMTS through coaxial cable network, fiber optical backbone or microwave radio link.
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The multipoint antenna enables bidirectional communication between the main station and end-users.