ts to tap

Question 1

A network architecture developed by the cable industry, which typically uses fiber optic cables to bring signals to selected areas of the system called nodes, which are usually based on the number of subscribers to be served.

Answer 1

HFC

Question 2

This architecture was developed to replace Tree and Branch architecture as networks were rebuilt or upgraded

Answer 2

HFC

Question 3

The topology where signals originate in the headend and are transmitted long distances via trunk cables, which have branches for directing the signal to customers.

Answer 3

Tree and Branch

Question 4

The network architecture is based on a single common infrastructure in which all services are delivered via IP over a consistent transport and routing architecture.

Answer 4

CRAN

Question 5

Because of the cumbersome nature of large numbers used to discuss optical frequencies, scientists refer to frequencies of light by their __________.

Answer 5

wavelength

Question 6

is a measurement of distance, the distance that signal of a specific frequency travels (at the speed of light) during the time it takes to complete one full cycle.

Answer 6

wavelength

Question 7

Responsible for receiving and processing signals and sending the signals over the network to customers

Serves as a gateway to both the public Internet and Comcast’s own managed nationwide network

Connects Comcast customers to the local telephone company’s network

Answer 7

Headend

Question 8

The network architecture that is based on a single common infrastructure is referred to as the ________________________ in that all services are delivered via IP over a consistent transport and routing architecture.

Answer 8

Converged Network or the Converged RAN

Question 9

Inter-router links with speeds of ______ give CRAN a high capacity.

Answer 9

10 Gb/s+

Question 10

This is an electromagnetic signal above the audio and below the infrared frequencies.

Answer 10

Radio Frequency

Question 11

The cumulative effect of return path distortions added to the signal at various locations in the coaxial portion of the network.

Answer 11

Funneling effect:

Question 12

The return direction can suffer ingress from transmitters operating in the upstream frequency bandwidth such as:

Answer 12

Voice of America, CB, and Amateur Radio transmitters

Question 13

majority of ingress enters the system ________________________

Answer 13

between the Tap and the customer’s TV set.

Question 14

There are some problems that are unique to digital processing and transmission that, while present in analog transmission systems, generally result in lower intensity problems with analog pictures.Three digital distortions you should be concerned with are

Answer 14

 Spectral Re-growth
 Multipath and Reflections
 Phase Noise

Question 15

typically an overload effect noted through digital signal processing equipment. This is an overdrive, or over modulation of a single carrier. Sometimes an isolated carrier such as a return data carrier will show the problem as a result of return laser overdrive.

Answer 15

Spectral re-growth

Question 16

This is a common problem for digital carriers transmitted wireless, this relates to phase differential in the received signal which tends to increase MER and BER to the point of affecting digital decoding.

Answer 16

Multipath Effects and Reflections