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22 Cards in this Set
- Front
- Back
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The term fixed wireless is generally used to refer to _________.
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Building
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What is the connection that begins at a fast service provider, goes through the local neighborhood, and ends at the home or office?
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last mile
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All of the following are last mile connections for home users except ____________.
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baseband
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A leased special high-speed connection from the local telephone carrier for business users that transmits at 1.544 Mbps is ____________.
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T1
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The transmission that treats the entire transmission medium as if it were only one channel is ____________.
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basebnd
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WiMAX can communicate at speeds of up to ___________ in the 10 to 66 GHz bands, over short distances.
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120 Mbps
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The convergence sublayers in the WiMAX MAC protocol allow it to support __________.
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T1, ATM, Voice and video
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In the uplink direction, 802.16 transmits using _____________.
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TDMA
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LMDS has an advantage over MMDS in that the signals can travel up to 35 miles from the transmitter. True or False?
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False
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One of the limitations of LMDS and MMDS is that these systems operate at frequencies that require line of sight. True or false?
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True
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Devices in a WiMAX network must transmit in half-duplex only. True or False?
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False
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The WiMAX base station controls all transmissions in a WiMAX network. True or False?
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True
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Non-line-of-sight transmissions in the 802.16 standard are only supported in the 2 to 11 GHz bands. True or False?
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True
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Sometimes called fiberless optical, _________ uses no medium like a fiber optic cable to send and receive signals; instead, transmissions are sent by low-powered infrared beams through the open air.
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Free Space Optics or FSO
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The maximum coverage area for a Local Multipoint Distribution Service (LMDS) network is _________ miles.
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five
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A single WiMAX base station can communicate with __________ terminals simultaneously.
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hundreds of
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WirelessHUMAN stands for ____________________. This transmission mechanism is specific to the __________ band(s).
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wireless high-speed unlicensed metro area network; 5 GHz U-NII
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What is the significance of the fact that the distances in a WiMAX network are measured in miles (or kilometers)?
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When compared to 802.11 networks, WiMAX will free users from the limitation of having to be within 300 ft. of an AP and increase user mobility.
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What is the purpose of adaptive modulation in WiMAX?
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It enables WiMAX to dynamically adjust the signal to reduce or eliminate errors and maintain the connection and communications with a subscriber station (remote device), within the coverage area, albeit at a reduced data rate.
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List three modulation techniques used in 802.16.
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BPSK, QPSK, 16-QAM, 64-QAM are all correct. Students may also reply OFDM, OFDMA, TDM, TDMA although these are transmission and access techniques and not modulation techniques. However, most texts refer to OFDM and OFDMA as modulations.
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Where does the BS send information to the SSs about which modulations will be used for a particular burst or transmission?
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In the downlink (DL) map
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What is the difference between the 48-bit MAC address and the CID? What is the purpose of the CID?
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The 48-bit MAC address is used for hardware identification. The CID is used by the BS and SS to identify those subscriber stations that have established a connection to the network.
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