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Cisco 644-334 Dumps

SP Video Phase III Cable Access Networks
SP Video Phase III Cable Access Networks

Questions & Answers for Cisco 644-334

Showing 1-15 of 20 Questions

Question #1

What are two of the limitations with 1310nm transmission? (Choose two.)

A. Fiber losses are greater at 1310 nm than 1550 nm

B. DWDM is not possible at 1310 nm

C. Chromatic dispersion is a seriousproblemat a wavelength of 1310nm

D. 1310 nm transmitters cannotaccommodateda full (54MHz to 1 GHz) band of traffic

Question #2

The aggregate power of several signals at different wavelengths on the same fiber, when
the power of each signal is P dBm and the number of signals is N, this can be calculated

A. Multiplying P by N

B. Adding P to N

C. Adding 10xlog(N)toP

D. Converting P to milliwatts and adding N

Question #3

When designing an optical network with redundant paths and DWDM narrowcast traffic,
why is it more cost effective to locate the automatic optical switching in a hub site close to
the nodes, rather than by installing redundant receivers in the nodes?

A. in the event of a failure of the Primary link, the switchover from Primary to Backup will be faster

B. dual optical receivers in the opticalnodescannot be monitored or controlled by the ROSA Element Management system

C. Protection switching in the opticalnodeswould require a duplication of all the optical components in the Hub at eachnode

D. standalone optical switches are less expensive than dual receivers in the opticalnodes

Question #4

Which three of the following are examples of narrow cast traffic? (Choose three.)

A. Video-on-Demand (VD) signals

B. Voice over IP (VoIP) signals

C. High-speed data for Internet access

D. National video channels

E. Radio channels

Question #5

What test method is favored by Cisco for the characterization of upstream optical links?

A. Noise Power Ratio (NPR)

B. Measurement of CNR with several unmodulated RF earners

C. Amplitude/frequency response analysis

D. Measurement of CNR and Bit Error Ratio (BER) with live DOCSIS traffic

Question #6

What does the expression Physical nodes size' mean?

A. The number of subscribers served by the HFC network

B. The geographic dimensions of the area served by an OpticalNodes

C. The number of potential subscribers connected bycoaxialcable to a single OpticalNodes

D. The size of the area that can be served by a single optical transmitter

Question #7

For what conditions can the 1550nm broadcast optical transmitters manufactured by Cisco
can SBS if the optical power at the input to any significant length of the fiber at any point in
the transmission path not exceed?

A. The power at the output of the transmitter

B. thenatural SBS threshold of 8 9 dBm

C. 10 dBm

D. 17 dBm

Question #8

In engineering the upstream signal path, why is it desirable to ensure that all Cable
Modems transmit at a high RF signal level?

A. Most CableModemsperform better at higher output levels

B. theCiscoBOR (Baseband Digital Reverse) transmission system cannot operate with low RF input levels

C. A high RF level will ensure that themodemsignals will have a high Carrier-to-Noise Ratio as they leave the potentially noisy environment subscriber's home

D. This will speed up themodeminitializationprocess

Question #9

What is the difference between the levels when combining broadcast traffic and narrow
cast traffic at optical receiver?

A. 2 dB

B. 4 dB

C. 8 dB

D. 16 dB

Question #10

What does a Node Segmentation' project consists of?

A. Reducing the Physical Node size to effectively increase the bandwidth available to each subscriber

B. Replacing existing amplifiers with wider-bandwidth products

C. Reducing the number of optical receivers and transmitters in an opticalnodeto minimize power consumption

D. Allocatingsmaller segments of the overall bandwidth topocketsof subscribers

Question #11

A customer network is more than 10 years old. It has 2000 homes passed per node which
two situations are challenging when segmenting the serving areas so that each new area
serves approximately 500 homes-passed? (Choose two.)

A. There are no System Design tools available to assist in the design of such an upgrade

B. It is unlikely that the existing opticalnodewill have four RF outputs with approximately 500 homes-passed served by each output

C. The existing network was not designed withnodesegmentation in mind

D. No equipment is available to handle 500 homes passed pernode

Question #12

What does a Network Re-build 'consists of?

A. Replacing existing amplifiers with Wider-bandwidthproducts

B. Replacing existing amplifiers and subscriber taps with wider-bandwidthproducts

C. Construing a completely new plant in parallel with the old

D. segmenting thenodes

Question #13

Which two situations make High RF signal levels at the outputs of amplifiers desirable?
(Choose two.)

A. More subscribers can be reached' by each amplifier

B. Amplifier performance is optimal at higher RF signal levels

C. The number of RF amplifiers in anodeServing Area will be kept to a minimum

D. Power consumption is reduced in each amplifier

Question #14

What is the target optical input level to a Cisco node?

A. -17dBm

B. 0dBm

C. +3dBm

D. +17dBm

Question #15

In standard engineering practice, how is narrowcast traffic carried when transported from a
main headend to the nodes?

A. Separate fibers, with one fiber dedicated to each narrowcast transmission

B. The same fiber as thebroadcasttraffic

C. A single fiber separate from thebroadcasttraffic using O-band multiplexing

D. A single fiber separate from thebroadcasttraffic using DWDM, with each wavelength carrying the narrowcast traffic for onenode