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New NCT4
Study guide
44
Communication
Professional
02/17/2015

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Term
What is a Decibel (dB):
Definition
A Decibel is one tenth of a bel
Term
. What is the unit for expressing, in logarithmic terms the ratio between two power levels
Definition
Bel
Term
Current is measured in
Definition
Amps
Term
. "blank" is the force that cause electrons to flow
Definition
Voltage
Term
Resistance is measured in
Definition
Ohms
Term
The purpose of equalizers used in an Amp is to?
Definition
Compensate for the cable loss
Term
"Blank" is the measuring of analog signals at specific intervals
Definition
Sampling
Term
The definition of ingress is
Definition
unwanted signals entering the cable plant
Term
A beat is caused by
Definition
multitude of unwanted signals entering the cable plant
Term
Cross modulation is
Definition
Vertical bar moving slightly across the video portion of a cable channel
Term
Digital Signal
Definition
A discontinuous signal whose various states are discrete intervals apart
Term
Digitizer
Definition
A device used to convert analog signal to a digital signal
Term
Refers to an electrical impulse representing a zero or 1(smallest unit of measurement a pc can handle)
Definition
Bit
Term
A set of Bits, typically 8 but can be more
Definition
Byte
Term
The number of changed events or states that occur per Hertz
Definition
Baud(baud rate)
Term
Sampling, Quantization, and encoding is the process of
Definition
Analog to digital conversion
Term
Assigning a specific value to each of the samples
Definition
Quantization
Term
the process of converting these specific values into data
Definition
Encoding
Term
AM is the means of superimposing "blank" onto a RF carrier
Definition
Audio
Term
"blank" is the means of superimposing audio on a RF carrier on a specific Frequency
Definition
FM(Frequency Modulation)
Term
One of the most common impairments in a cable system
Definition
Ingress
Term
"blank" is typically caused by Power Passing Chokes or a Capacitor leak
Definition
Hum Modulation
Term
"Blank" is the over driving of an amplifier or laser circuits
Definition
Spectrual Re-Growth
Term
"Blank" is a simple indicator of the overall quality of the quam digital stream
Definition
DQI(digital quality index)
Term
"Blank" is used to compensate for the fluctuations in the input signal
Definition
AGC(automatic Gain Control)
Term
Cross Modulation
Definition
Vertical bar moving slightly across the video portion of the cable channel
Term
Quantization
Definition
The assigning of a specific value to each of the samples
Term
Return path interference
Definition
Interference such as voice of America CB and amateur radio transmitters are
Term
Wave Length
Definition
The distance between two points of like phase in a wave
Term
Unity Gain
Definition
Philosophy where the loss of the cable and other passive devices before a amplifier station equal the gain of the amplifier station
Term
Amplitude
Definition
This is the peak value of an AC waveform
Term
DOCSIS
Definition
Data over cable services interface specifications
Term
T3 timeouts
Definition
Number of timeouts caused by the router not receiving a response within a specified time from the CMTS to a ranging request
Term
TDMA
Definition
In the upstream is time slot management
Term
SCDMA
Definition
In the upstream is code management
Term
Directional coupler
Definition
Passive device that splits the signal into two transmission lines in parallel
Term
Signal level meter
Definition
Tool used to measure signal levels at specific tunable frequencies
Term
Signal leakage detector
Definition
This tool uses a dipole antenna to detect a signal leak and determine its direction
Term
Root Mean square meter
Definition
This tool accurately measures AC voltages of signals other than pure analog sine waves
Term
Cable locator
Definition
This tool is used to find the location/path of underground cables
Term
Protocol
Definition
This is a set of rules that govern how devices message each other to transport data
Term
Watch Tower
Definition
This tool provides a real time snapshot, and maps all aspects of the network including, power and facilities
Term
Tilt
Definition
This function checks forward low and high frequencies, based on these readings you can choose and equalizer pad that will provide optimum flatness at the end of the line
Term
Mini-Scan
Definition
In this mode your meter monitors up to 12 channels at a time
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