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Wireless Broadband Modems

Table of Contents:
Definition and Overview
1. Internet Transmission Basics
2. Basics of Cable-Modem System and Cable Modem
3. Architecture of a Wireless Downstream System
4. Frequency Bands and Limitations
5. Receiving the Signal at the Subscriber
6. Getting the Signal to the Broadcast Wireless Transmitter
7. Wireless Return (Two-Way Wireless) Options
8. Business Background for Wireless Internet Access
9. Business Applications of the Internet
10. MMDS/WCS Transmitter Systems for Internet Access*
11. MMDS Path Engineering: An Example*
12. MMDS Path Engineering: The Math*
13. Additional Sources of Information
Self-Test
Glossary
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Self-Test
1. Which of the following is not one of the parameters with significant impact on downstream speed for IP traffic?
a. downstream bandwidth
b. latency or round-trip delay to the server
c. upstream bandwidth
2. Approximately how long does it take to transmit an ACK through a 14.4 Kbit telephone return channel? (Ignore any latency in the modem.)
a. 33.3 msecs
b. 45.0 msecs
c. 15.2 msecs
3. What is the typical frequency stability requirement on a customer's downconverter?
a. 5 ppm (12.5 kHz)
b. 30 ppm (75 kHz)
c. 50 ppm (125 kHz)
4. Why is this frequency stability important?
a. The modem demodulator has to track this offset.
b. impacts the upstream frequency stability
c. requires retuning the modem
5. Which of the following wireless bands is not used for analog television today?
a. MDS1
b. MMDS
c. WCS
6. Why is LOS operation recommended (though not essential) for VHF, UHF, and LPTV as well as for the 2GHz bands?
a. Multipath can add or detract from the signal strength.
b. Multipath changes the phase of the received signal.
c. It is easier to stay within the signal level required by the modem.
7. Which factor influences the location of the Internet head end or POP?
a. accessibility for maintenance
b. location of the wireless transmitter
c. both of the above
Glossary >>

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