Local Multipoint Distribution Service

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LMDS is a broadband wireless access technology governed by the IEEE
and is outlined by the 802 LAN/MAN Standards Committee
through the efforts of the IEEE 802.16.1 Task Group.

LMDS commonly operates on microwave frequencies across the 26GHz and 29GHz
bands. In the United States, frequencies from 31.0 through 31.3 GHz are also
considered LMDS frequencies.

LMDS was conceived as a broadband, fixed wireless, point-to-multipoint
technology for utilization in the last mile.

Throughput capacity and reliable distance of the link depends on common radio
link constraints and the modulation method used - either phase-shift keying or
amplitude modulation. In general deployment links of up to 5 miles (8 km) from
the base station are possible, but distance is typically limited to about 1.5
miles due to rain fading attenuation constraints.

Point-to-point systems are also capable of using the LMDS frequencies and can
reach slightly farther distances due to increased antenna gain.

Contents

1 LMDS History and Outlook:
United States

2 Makers

3 See also

4 External links

[edit]
LMDS History and Outlook: United States

LMDS showed great promise in the late 1990s. It became known as "wireless
cable" for its potential to enable competition with the cable companies for
broadband video to the home. The Federal
Communications Commission auctioned spectrum for LMDS in 1998 and 1999.

Despite its early potential and the hype that surrounded the technology, LMDS
was slow to find commercial traction. This is mostly attributable to the
telecommunications and technology bubble bursting at the time when LMDS was
maturing as a concept and LMDS hardware was just starting to come to market.
Many equipment vendors simply abandoned their LMDS product portfolios. LMDS is
currently in commercial deployment with Nextlink Wireless in the United States.

Many industry watchers believe that the window for LMDS has closed, with the
technology having been superseded by several market forces and technologies.

First of all, most homes are already reached by at least one broadband
technology -- generally either DSL or cable internet.
Furthermore, major telecommunications companies (notably Verizon
Communications) have been aggressive about deploying technologies such as IPTV and fiber to the
premises. Moreover, LMDS has been surpassed in both technology and
commercial potential by the new WiMax standard. (Sprint
Nextel has announced a major commitment to WiMax.)

[edit]
Makers

Alcatel:
7390
LMDS Solution

Alvarion: WalkAIR

Ensemble
Communications

Ericsson: MiniLink-BAS
and Beewip

Hughes: AIReach

Nokia: AIReach
OEM

Siemens: WALKair3000
OEM

Vyyö:
Wireless
Hub V3000, that uses the DOCSIS standard adapter to
wireless technology.

Cambridge
Broadband: VectaStar

[edit]
See also

Hydrometeor

Multichannel
Multipoint Distribution Service (MMDS)

Wireless local
loop

Point
to point Microwave

Microwave

[edit]
External links

LMDS Frequently Asked
Questions

Retrieved from "http://en.wikipedia.org/wiki/Local_Multipoint_Distribution_Service"

Categories: Wireless |
Telecommunications

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This page was last modified 14:14, 27 June 2007.

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