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NCTI TECH I TO TECH II QUESTIONS WITH VERIFIED ANSWERS ALREADY GRADED A+
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NCTI TECH I TO TECH II QUESTIONS WITH VERIFIED ANSWERS ALREADY GRADED A+
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Name: Score:111 Multiple choice questions
Term 1 of 111
What does a transpositionor miswire indicate?
Asymmetric data throughput is a term that describes the downstream data throughput
as being significantly higher downstream than upstream.
The "M" position on the Harris TS21 allows line monitoring without disrupting
conversations, data, or signaling.
A transposition or miswire indicates the improper assignment of individual wire pairs to
pins for the wiring scheme tested.
A split pair occurs when the tip (positive conductor) or ring (negative conductor) of one
pair is connected to the tip or ring of an adjacent pair.
Term 2 of 111
What does the "M" position on the Harris TS21 allow?
Intraframe coding is a form of spatial compression and interframe coding is a form of
temporal compression.
The "M" position on the Harris TS21 allows line monitoring without disrupting
conversations, data, or signaling.
The four most common types of telephone line noise are: (1) static; (2) hum; (3) crosstalk;
and (4) radio interference.
PQM are objective metrics of human visual perception based on statistical analysis of
quality of service measurements and MPEG encoding data.
,Term 3 of 111
What information can be obtained from the adaptive equalizer taps displayed in the digital
signal analyzer?
The adaptive equalizer taps can be used to determine the presence and estimate the
location of reflections caused by bad connectors or damaged coaxial cable.
The cable modem is the logical place to begin using the divide-and-conquer method to
identify where an HSD problem originates in the customer premises.
Discuss the problem with the customer and then ask them to demonstrate the problem
they are experiencing so that you can view the symptoms and assess the problem, taking
note of any unusual screens or customer entries.
The cable modem and the cable modem termination system (CMTS) are the main
components in the DOCSIS architecture.
Term 4 of 111
What are the two types of telephone station wiring typically installed in customer premises?
The voltage/signal source, consisting of the NID/EMTA, the station wiring, the
terminations, such as connectors, plugs, and jacks, and the CPE are the four major
components of a telephone circuit in the customer premises.
With a throughput of 38 Mbps in a 256-QAM channel, the maximum throughput for eight
bonded channels is: 38 Mbps × 8 = 304 Mbps.
Quad station wire and unshielded twisted-pair (UTP) cable are the two types of station
wire typically installed in customer premises.
QoE is a subjective perception of digital video quality, whereas QoS is a measure of
objective network data.
,Term 5 of 111
When testing the USOC wiring configuration, pair _________ is the default pair ready to test.
The peak power of each OFDM subcarrier aligns with the minimum power of the adjacent
subcarrier, or orthogonal.
When testing the USOC wiring configuration, pair 1 is the default pair ready to test.
The test result indicators include pass, reversal, open, short, transposition or miswire, and
split pair.
The adaptive equalizer taps can be used to determine the presence and estimate the
location of reflections caused by bad connectors or damaged coaxial cable.
Term 6 of 111
List likely causes of remote control problems?
Broadcast is a one-to-all addressing scheme in which one device sends the same stream
of data to an address that all connected devices can receive. Multicast is a one-to-many
addressing scheme in which one device sends a stream of data only to specifically
addressed devices on the network.
5 - Perfect. 4 - Fair; imperfections can be seen but they are not too common as to be
irritating. 3 - Artifacts appear often enough to be annoying. 2 - Very annoying; nearly
impossible to watch anymore. 1 - No image.
The characteristics of a good troubleshooter include the desire to solve problems and fix
things, the know-how to use a variety of pieces of test equipment, accuracy in
documenting measurement results, and the pride in your work that prevents you from
settling for marginal results.
Likely causes of remote control problems include: (1) A blocked line of sight between the
remote control and the set-top box (STB); (2) a defective STB; (3) weak or dead batteries
in the remote control; (4) a deprogrammed remote control; or (5) a defective remote
control.
, Term 7 of 111
What is the significance of the REN rating when diagnosing a telephone ringer problem?
Placing the talk/monitor (T/M) switch of the Harris TS21 in the "T" (talk) position
establishes an off-hook condition for dialing and talking.
On-networking programming is under the control of the cable operator and off-network
programming is not under the control of the cable operator as it arrives at the customer
location via the Internet.
As a substitute modem, the analyzer can help determine whether a modem is defective
or if the problem is with the computer without going through the process of provisioning
another modem.
If the total REN of the telephones, fax machines, etc., connected to one telephone line
exceeds the REN of the service, some or all of the ringers may not operate.
Term 8 of 111
How is availability different from reliability?
Availability is the ratio of time that a device, system, network, or service is available for
use to total time. Reliability is the probability that a system or device will not fail during a
specified period.
To place the Lil' Buttie Pro in the talk position, push the TBM switch up in the "Talk" or off-
hook position, then read the dialing mode, the measured off-hook line current in
milliamperes, and the line polarity (NRM or REV).
5 - Perfect. 4 - Fair; imperfections can be seen but they are not too common as to be
irritating. 3 - Artifacts appear often enough to be annoying. 2 - Very annoying; nearly
impossible to watch anymore. 1 - No image.
On-networking programming is under the control of the cable operator and off-network
programming is not under the control of the cable operator as it arrives at the customer
location via the Internet.
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