International Engineering Consortium
Web ProForums
Cable Modems

Self-Test
1. In addition to their other functions, cable modems function as 64/256 QAM receivers and QPSK/16 QAM transmitters.
a. true
b. false
2. Cable modem users can modify the baseline privacy interface (BPI) to defeat data encryption.
a. true
b. false
3. A CMTS provides an extended Ethernet network with a geographic reach of up to ______.
a. 1 mile
b. 0 miles
c. 100 miles
d. none of the above
4. The upstream data channel specification requirements feature which of the following?
a. 64 and 256 QAM formats
b. data rates from 320 kbps to 10 Mbps
c. 6 MHz–occupied spectrum that coexists with other signals in the cable plant
d. all of the above
5. If a subscriber is receiving or sending data on a cable modem, regular cable television service is momentarily interrupted.
a. true
b. false
6. Current cable modem standards have completely rejected the ATM protocols as a data transmission method, as proposed by the IEEE 802-14 Committee.
a. true
b. false
7. Cable modem operations can be managed by a local cable company or from a remote location.
a. true
b. false
8. Among other functions, the media access control (MAC) layer provides control of subscriber upstream transmissions such that no more than 25 percent of all such transmissions can collide (thereby requiring retransmission).
a. true
b. false
9. As the number of subscribers increases in a cable data network, all of the users will experience poor performance in their Internet access.
a. true
b. false
10. In a cable data network, Web television users can access all of their neighbors' data on television.
a. true
b. false

Registered Users
Enjoy exclusive access to free On-Line Education and receive the biweekly IEC newsletter.

IEC Newsletter
Get the latest industry information including critical insights from key industry leaders, technology briefings, and an Analyst Corner.
Current
Subscribe

Newsroom

IEC Corporate Member

Advertising Kit