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ソフトウェア Alvarion BreezeACCESS 4900のPDF 概要をオンラインで閲覧またはダウンロードできます。Alvarion BreezeACCESS 4900 5 ページ。 4.9 ghz band licensing and rules
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4.9 GHz Band Licensing and Rules Overview

Channel Plan

The FCC has divided the band into 18 channels in the table below. Channels may be

aggregated, and operated in channels of up to 20 MHz. BreezeACCESS 4900 can be

configured to any 5 or 10 MHz block of spectrum within the band.

Frequency Coordination

A general 4.9 GHz license gives an agency the right to use the entire 4940-4990 MHz

frequency band. Multiple agencies may receive licenses within the same geographic area,

so interference is possible. Usually interference can be prevented or eliminated by

affected licensees working together on a technical solution, and possibly sharing the same

infrastructure. Many 700 MHz Regional Planning Committees are handling local

frequency planning in 4.9 GHz. A frequency plan does not have to be in place prior to

use of the band. Any agency may use the band upon obtaining a license.

Emission Mask

In November 2004, the FCC defined two masks for use in the 4.9 GHz band: the DSRC-

A mask (identical to the mask defined in the 802.11 standards) for a low power devices,

and the DSRC-C mask, with better adjacent channel protection, for higher power devices.

BreezeACCESS 4900 meets the DSRC-C mask, allowing the system to transmit at higher

power levels, providing for superior range, throughput and non-line-of-sight

performance.

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