Page 141 - DCAP311_DCAP607_WIRELESS_NETWORKS

Unit 8: Wireless MAN

the circularly polarized (CP) wave. As a result, the LP antenna will have a polarization mismatch Notes
loss of 0.5 (-3dB), no matter what the angle the LP antenna is rotated to. Therefore:
PLF (linear to circular) = 0.5 = – 3dB
!

Caution The Polarization Loss Factor is sometimes referred to as polarization efficiency,
antenna mismatch factor, or antenna receiving factor. All of these names refer to the same
concept.

Self-Assessment

Fill in the blanks:
1. ................................... enables you to access the Internet and multimedia streaming services
via a wireless region area network
2. The most well-known wireless networking technology is ...................................

3. The first WiMAX standard ..................................., was created to administrate the
interoperability of all devices working between 10 and 66 GHz.
4. A network ...................................can connect wired devices to a wireless network.

5. ................................... can either be used to add wireless capabilities to a non-wireless router
or improve the speed and range of an existing wireless network.
6. Wireless Bridging is used to connect two ................................... segments via a wireless link.
7. A wireless ................................... bridge allows the connection of devices on a wired Ethernet
network to a wireless network.
8. Usage Semi-directional antennas are ideally suited for short and medium range ................
...................
9. A highly ................................... antenna offers a number of advantages over the other two
types, which are omni-directional and semi-directional antennas.

10. Two antennas that are both circularly ................................... do not suffer signal loss due to
polarization mismatch.



Case Study WMAN Implementations in India
Network Magazine – Issue of September 2002
Pravara Village IT Project (PRAGATI) is a classic example of how new technology can
narrow the digital divide. Thanks to this project the rural communities of Ahmednagar
district in Maharastra are able to compete with their urban counterparts…wirelessly. by
Akhtar Pasha
Promoted by National Informatics Centre (NIC), Delhi; the PRAGATI project aims to
connect a hundred villages in Ahmednagar covering a population of more than 2.5 lakh
with a wireless MAN solution (WMAN). When completed, it will empower the rural
population and improve their quality of life. The seven lane program will help the villages
in establishing local IT centers, dissemination of information regarding government
schemes, marketing of agricultural products, healthcare, education, agro processing and
economic development.
Contd...

LOVELY PROFESSIONAL UNIVERSITY 135