N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 9 - Wireless Systems and Technologies                                                                                 Slide 37 of 80                                                                                                    ________________

Fixed Terrestrial Wireless Systems

                                    Broadband in Nature 

                                    Local Multi-Point Distribution System (LMDS)

                                    Multi-channel Multipoint Distribution System (MMDS)

                                    Wireless Local Loops (WLL)

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Fixed terrestrial wireless systems support services requiring wide bandwidths. Fixed wireless installations offer highly reliable communications to deliver television signals, high-speed data and voice telephony. They are a viable alternative to conventional wired networks. Three types of fixed wireless services are available: LMDS, MMDS and WLL.

LMDS - is a system for broadband microwave wireless transmission direct from a local antenna to homes and businesses within a line-of-sight radius. LMDS is known in Canada as Local Multipoint Communications System (LMCS). LMDS is seen as a last-mile technology to provide high-bandwidth services to users.

MMDS - is a system for delivering high quality television, Internet, and other data transmission services to both business and residential customers.

WLL - is a system that connects subscribers to the Public Switched Telephone Network (PSTN). This includes cordless access systems, proprietary fixed radio access, and fixed cellular systems.