N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 9 - Wireless Systems and Technologies                                                                                 Slide 49 of 80                                                                                                    ________________         

                                                Example - A MMDS System

                                            MMDS Hub

                                            Local TV Station

                                            Transmitters/Receivers

                                            Subscribers

                                                                                                   ________________

The MMDS Hub could be connected to other hubs or networks via fiber-optical links. It receives the programs and adds local community content for local broadcasting. MMDS systems are intended for a local community.

MMDS systems affordability for the broadcast range of social strata of population having different incomes is considered a very important advantage. MMDS can be applied both as simple and inexpensive solutions for receiving TV programs by the entire urban population and as a value-added TV system providing channel packages for customers who want value for their money. MMDS can also be used for accessing data transmission networks, Internet and telephone services.

A typical system includes:
        - modulators
        - upstream receiver system
        - digital/analogue transmitters
        - digital/analogue channel combiners
        - network management system
        - automatic or manual back-up system
        - broadband repeaters
        - antennas
        - waveguide and coaxial cable