Multichannel Multipoint Distribution Service
From Free net encyclopedia
Multichannel multipoint distribution service, also known as MMDS or wireless cable, is a wireless telecommunications technology, used for general-purpose broadband networking or, more commonly, as an alternative method of cable television programming reception. MMDS is used in the United States and other countries, including Canada, Mexico, Ireland, Brazil, Australia and Pakistan, usually in sparsely populated rural areas, where laying cables is not economically viable.
The MMDS band uses microwave frequencies from 2 GHz to 3 GHz in range. Reception of MMDS-delivered television signals is done with a special rooftop microwave antenna and a set-top box for the television receiving the signals. The receiver box is very similar in appearance to an analog cable television receiver box.
In Canada Look Communication inc offer digital television and wireless bi-directional high speed internet from its MMDS transmiter situated in Ontario and Quebec. Range can be up to 25 km from transmitting tower for its bi-directional internet service. They offer 3 Mbit/s for download (from tower) modulated in QAM and 200 kbit/s for upload (from the tower installed in your home) modulated in QPSK.