Cisco Cisco WT2750 Multipoint Broadband Wireless System Guia De Informação
DC Power Injector (−48VDC for high−power ODU or +24VDC for standard power
ODU) with power supply
ODU) with power supply
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SU Transverter (ODU) − two needed if using diversity; available either integrated
with antenna or nonintegrated, and either providing high or standard power
with antenna or nonintegrated, and either providing high or standard power
Note: Diversity antenna is RX only.
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SU Directional Antenna (if not using integrated ODU)
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Lightning arrestors
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Q. How are point−to−multipoint networks typically designed?
Supercell:
Up to 20 miles in diameter (10 mile radius)
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Single HE
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Minicell:
Four to 10 miles in diameter (two to five mile radius)
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Can employ frequency reuse
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Microcell:
Up to two miles in diameter (one mile radius)
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SUs can use lower TX power
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Allows maximum number of SUs within given area
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Allows for frequency reuse
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Q. What are the frequency bands used for this system?
MMDS: 2.500 − 2.690 GHz
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MDS: 2.150 − 2.162 GHz (used for upstream only)
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ETSI: 3.400 − 3.600 GHz (ODU will be available second half of 2001)
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U−NII: 5.725 − 5.825 GHz (ODU will be available first quarter of 2001)
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Q. What is the modulation scheme that the Cisco WT−2750 Multipoint
Broadband Wireless System uses?
Broadband Wireless System uses?
A. 64QAM over Vector Orthogonal Frequency Division Multiplexing (VOFDM)
Q. What is Vector Orthogonal Frequency Division Multiplexing (VOFDM),
and why is VOFDM so compelling?
and why is VOFDM so compelling?
A. VOFDM leverages multi−path phenomenona key deterrent in microwave
transmissioninto real life deployment advantages. VOFDM technology increases
transmission signal strength through a combination of multiple signals at the receiving end.
VOFDM increases the overall wireless system performance, link quality, and availability.
VOFDM also dramatically increases the market coverage of service providers through
non−line−of−sight transmission.
transmissioninto real life deployment advantages. VOFDM technology increases
transmission signal strength through a combination of multiple signals at the receiving end.
VOFDM increases the overall wireless system performance, link quality, and availability.
VOFDM also dramatically increases the market coverage of service providers through
non−line−of−sight transmission.
Q. What is the maximum coverage range?
A. You can have 3, 4, and 6−sector designs, based on different off−the−shelf antenna designs.