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About This QuizConsumers have a couple of options for high-speed Internet access. Digital subscriber lines (DSL) are one of them. Test your DSL knowledge in our quiz!
What kind of cables connect DSL modems to the Internet?
Regular telephone cables
A DSL modem uses the same telephone wires you use for your regular telephone service.
A coaxial cable
What is the main drawback for ADSL modems?
You can't use a telephone while you use the modem.
DSL modems require extensive rewiring.
The farther you are from the local switching office, the slower your connection will be.
The main problem with ADSL is that the speed of your service depends on how far away you are from the local telephone switching office. But you can use a phone and an ADSL modem at the same time with no problem, and most of the time there's no need to do any rewiring with a DSL system.
What is an asymmetric DSL line?
A fiber-optic cable that carries DSL signals to and from a service provider.
A DSL line that provides more bandwidth for downloading information than for uploading data.
Asymmetric DSL lines (ADSL) dedicate more bandwidth for downloads than uploads. Most users are downloading far more information than they upload to the Internet, so it makes sense to prioritize download speed over upload speed.
A cable that is almost, but not quite, long enough to reach from your wall to your computer.
What is the official standard for ADSL called?
Discrete multitone (DMT)
The discrete multitone (DMT) standard is the official standard for ADSL. It divides data into 247 separate channels, each of which is 4 kilohertz wide.
Carrierless amplitude/phase (CAP)
Digital signal amplitude (DSA)
What is the name of the device you connect to regular phone outlets that blocks ADSL signals?
Low-pass filters block signals over a certain frequency. Human conversations take place below 4 KHz, whereas ADSL signals are above 4KHz. By blocking all signals over 4 KHz, a low-pass filter prevents ADSL from interfering with a telephone signal.
What is a DSL Access Multiplexer (DSLAM)?
A custom-made roller coaster at the Googleplex
A device a service provider uses to collect incoming DSL signals
A DSLAM aggregates customer connections and links them to a high-capacity Internet connection.
What is the distance limit for ADSL service?
ADSL service can extend 18,000 feet (5,460 meters) before the speed and quality of service dips below acceptable levels.
How many frequency bands are in a CAP DSL system?
A CAP system divides telephone signals into three bands of frequencies. The first band ranges from 0 KHz to 4 KHz and covers all telephone communication. The second band ranges from 25 KHz to 160 KHz and carries all uploads to the system. The third begins at 240 KHz and carries all downloading signals.
What's another name for a DSL modem?
Digital Internet tuner
DSL modems are transceivers -- they send and receive signals to and from the user's computer and the Internet service provider.
There are two kinds of cables commonly used to connect a DSL modem to a computer. One is a USB cable. What's the other?
Most DSL modems connect to computers using either a USB cable or an Ethernet cable.
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