Alvarion BreezeACCESS 4900 Ikhtisar - Halaman 2
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Halaman Cetak4.9 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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