Review Questions 413
12. Which three statements accurately describe DSL?
a. An ISP is not required to connect enterprise users through DSL.
b. Current DSL technologies use sophisticated coding and modulation techniques to
achieve data rates of up to 10 Mbps.
c. A subscriber can connect to a DSL enterprise network directly.
d. DSL technology is a circuit-switched connection technology that uses existing
twisted-pair telephone lines to transport high-bandwidth data, such as multimedia
and video, to service subscribers.
e. DSL technology allows use of the local-loop line for normal telephone voice connection
and an always-on connection for instant network connectivity.
f. DSL technologies place upload (upstream) and download (downstream) data
transmissions at frequencies above a 4-kHz window, allowing both voice and
data transmissions to occur simultaneously on a DSL service.
13. Which two of the following are types of DSL?
a. ADSL
b. IDSL
c. LDSL
d. D-lite
e. GDSL
14. Which three statements are considerations for DSL?
a. DSL is not backward compatible with analog voice connections.
b. DSL service can be incrementally added in any area.
c. Most DSL service offerings currently require the customer to be within 10,000
feet of the CO location of the provider.
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