|
1. Load coil detection is important, but not crucial, in determining whether or not a loop is capable of supporting DSL services.
2. The accepted practice for engineering local loops is referred to as revised resistance design (RRD) rules.
3. According to Telcordia, approximately 88 percent of loops are less than 18,000 feet, and 65 percent comply with carrier service area (CSA) design rules.
4. The legacy POTS testing systems measure loop length using simple tip-to-ring capacitance measurements.
5. A bridge tap is any unterminated portion of a loop not in the direct talking path between the CO and the DLC.
6. The prime advantage of xDSL transmission technologies is _______.
| a.
|
its improvement over DSL technologies
|
| b.
|
its use of existing copper wiring
|
| c.
|
its delivery of high-speed data and voice services
|
| d.
|
its use of fiber-optic wiring
|
7. One factor, _________, blocks all xDSL technologies.
| a.
|
the presence of load coils in the loop
|
| b.
|
the absence of load coils in the loop
|
| c.
|
the width of the loop
|
| d.
|
the absence of bridge taps
|
8. _________ is another significant obstacle for LECs.
| a.
|
Use of copper loops
|
| b.
|
The scarcity of copper loops
|
| c.
|
The inability to prequalify copper loops
|
| d.
|
The difficulty of measuring copper loops
|
9. ___________ are two methods of prequalification testing.
| a.
|
Single-sided and double-sided
|
| b.
|
Unidirectional and bidirectional
|
| c.
|
Single-ended and double-ended
|
| d.
|
Customer-based and OSP–based
|
10. The testing elements required to provide the most efficient delivery of xDSL include ___________.
| a.
|
load coil detection and measurement of line length
|
| b.
|
detection of bridge taps an wide-band noise measurement
|
| c.
|
metallic tests and longitudinal balance
|
| d.
|
none of the above
|
| e.
|
all of the above
|
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