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Self-Test
1. ADSL increases existing twisted-pair access capacity by __________.
a. twofold
b. threefold
c. thirtyfold
d. fiftyfold
2. A modem translates ______________.
a. analog signals into digital signals
b. digital signals into analog signals
c. both of the above
3. The 1948 theorem which is the basis for understanding the relationship of channel capacity, bandwidth, signal-to-noise ratio is known as ______________.
a. the Peter Principle
b. the Heisenberg Uncertainty Principle
c. Shannon's Law
d. Boyle's Law
4. What appears to be the practical limit for analog modems over the standard telephone network?
a. 33 kbps
b. 28.8 kbps
c. 24 kbps
d. 19.2 kbps
5. Digital subscriber line (DSL) refers to ________________.
a. a specific gauge of wire used in modem communications
b. a modem enabling high-speed communications
c. a connection created by a modem pair enabling high-speed communications
d. a specific length of wire
6. T1/E1 and HDSL are essentially equivalent technologies.
a. true
b. false
7. ADSL cannot handle Internet or LAN access.
a. true
b. false
8. What is the source of limitation on the bandwidth of the public switched network?
a. subscriber line
b. the core network
9. The practical upper limit of length of ADSL is ______________.
a. 6,000 ft
b. 12,000 ft
c. 18,000 ft
d. 36,000 ft
10. T1 and DS–1 refer to the same multiplexing system. Which one is generally used to refer to the raw data rate?
a. T1
b. DS–1
Glossary >>

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