Page 90 - DCAP311_DCAP607_WIRELESS_NETWORKS

Wireless Networks

Notes 5.5.4 Reliability

The internal antenna in a dongle is used to deliver interference-free reception under optimal
conditions. The passwords and user names provide the user-level authentication.

Self-assessment

Fill in the blanks:
6. The internal antenna in a dongle is used to deliver ................................ reception under
optimal conditions
7. The function of a Bluetooth ................................ is to allow you to create a Bluetooth network
for your computer if it is not already Bluetooth-enabled.
8. A ................................ adapter is a type of protocol converter which is used for converting
USB data signals to and from other communications standards.
9. A wireless ................................ is commonly used to provide access to the Internet or a
computer network.

10. The USB processor sends the processed USB signals to a serial driver chip which applies
the correct ................................ and sends the processed data signals to the serial output
11. The internal ................................ in a dongle is used to deliver interference-free reception
under optimal conditions

Task Compare the major Bluetooth dongles available in the market.



Case Study How Cisco Upgraded Its Wireless Infrastructure
n 2000, Cisco® IT designed and deployed a global WLAN infrastructure that serves
all Cisco offices. Originally designed as a secondary network for intermittent data
Iusage, the WLAN proved very popular with Cisco's highly mobile workforce. Within
two years, nearly 25 percent of Cisco employees were using the WLAN as their primary
network access medium, and many were also using a variety of wireless voice services.
By 2005, it was clear that an upgrade of the WLAN infrastructure was necessary as user
adoption continued to increase. What was originally a secondary network was now deemed
business-critical by the majority of Cisco employees, with 81 percent of users describing
the WLAN as "critical" or "extremely important" for their day-to-day productivity. The
original infrastructure was reaching the end of its useful lifetime, and many components
were no longer sold or supported. Additionally, Cisco business managers were calling
for improvements in service availability and operations; business objectives for the
upgraded infrastructure included reduced support costs, enhanced stability and security,
and an increased Service Level Agreement. Perhaps most importantly in today's business
environment, the existing WLAN could not offer the performance and stability required
for high levels of wireless voice and video traffic.
Challenge
The challenge for Cisco IT was to continue providing a global wireless LAN that could
serve as a primary access medium and deliver more bandwidth and coverage to more
Contd...

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