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Digital Loop Carrier (DLC)

Table of Contents:
Definition and Overview
1. History of Subscriber Carriers
2. Early Next-Generation Digital Loop Carriers
3. Next-Generation Digital Loop Carriers for Rural and Suburban Applications
4. NGDLC Applications
5. Future Directions
6. Economics
7. The Multiservice DLC
Self-Test
Glossary
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Self-Test
1. Local-loop technology was originally driven by __________ considerations.
a. economic
b. environmental
c. service-quality
2. The latest NGLDC networks are based on _______ media.
a. ring
b. fiber
c. mixed
3. The earliest digital loop technology offered pair-gain improvements of _______________.
a. 4 to 1
b. 96 to 1
c. 12 to 1
4. Early NGDLC aimed at _________.
a. high concentrations of subscribers
b. wide coverage
c. software-based service provisioning
d. all of the above
5. Early NGDLC ___________ relatively high degree of common control.
a. required
b. did not require
6. The maximum number of subscribers for an analog system was ________.
a. twelve
b. eight
c. three
7. Early NGDLC systems were optimized for high concentrations of subscribers up to _________________.
a. 2,000 lines
b. 5,000 lines
c. 10,000 lines
8. Most network topologies are ______________.
a. star
b. ring
c. mesh
9. NGDLC technology is particularly effective because it ______________.
a. offers low common control
b. can be easily expanded as the subscriber base expands
c. can be used with whatever architecture already exists
d. all of the above
10. The use of cable modems allows the delivery of up to ________.
a. 64 kbps
b. 1–2 Mbps
c. 6–8 Mbps
d. 1–2 Gbps
Glossary >>

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