Thursday, 21 February 2008

wcs11 Wireless Metropolitan Area Networks

1 . The term fixed wireless is generally used to refer to building.

2. What is the connection that begins at a fast service provider, goes through the local neighborhood, and ends at the home or office?
Last Mile.

3. All of the following are last mile connections for home users except satellite.

4. A leased special high-speed connection from the local telephone carrier for business users that transmits at 1.544 Mbps is T1.

5. The transmission that treats the entire transmission medium as if it were only one channel is baseband .

6. WiMAX can communicate at speeds of up to 120Mbps in the 10 to 66 GHz bands, over short distances.

7. The convergence sublayers in the WiMAX MAC protocol allow it to support T1, ATM, voice and video.

8. In the uplink direction, 802.16 transmits using the downlink frame.

9. LMDS has an advantage over MMDS in that signals can travel up to 35 miles from the transmitter. False.

10. One of the limitations of LMDS and MMDS is that these systems operate at frequencies that require line of sight. True.

11. Devices in a WiMAX network must transmit in half-duplex only. False.

12. The WiMAX base station controls all transmissions in a WiMAX network. True.

13. Non-line-of-sight transmissions in the 802.16 standard are only supported in the 2 to 1 1 GHz bands. True.

14. Sometimes called fiberless optical,FSO uses no medium like a fiberoptic cable to send and receive signals; instead, transmissions are sent by low-power infrared beams through the open air.

15. The maximum coverage area for a local multipoint distribution service (LMDS) network is 5 miles.

16. A single WiMAX base station can communicate with multiple terminals

17. Wireless HUMAN stands for Wireless High-Speed unlicensed metro area network .This transmission mechanism is
specific to the 5 GHz U-NII band(s).

18. What is the significance of the fact that the distances in a WiMAX network are measured in miles (or kilometers)?
Under Ideal, Line of sight Conditions.