Term
| How often must the FCC pop test be performed |
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Definition
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Term
| When performing a pop test, what is the maximum variation within a 24 hour ADJACENT CHANNEL interval? |
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Definition
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Term
| Hum modulation is measured in |
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Definition
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Term
| How many times must the 24-hour level variation tests be performed? |
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Definition
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Term
| What is Comcast's goal for network reliability? |
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Definition
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Term
| Which of the following most closely explains what a spectrum analyzer does? |
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Definition
| Continually scans the spectrum and has 'zoom' functionally |
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Term
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Definition
| a continous wave (CW) frequency onto which information is modulated for transport |
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Term
| POP test must be maintained on file at the operator's local business office for at least? |
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Definition
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Term
| Number of FCC POP test points per number of customers. 1000-12,500 |
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Definition
| 6. for each additional 12,500 customers add 1 test point |
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Term
| Many of the FCC POP standards require that you take measurments at the end of a? |
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Definition
| 30 meter (100') test drop |
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Term
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Definition
| is frequency-specific-- only 1 analog channel per test point needs to be tested-- % |
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Term
| Number of test channels depend on the highest operating frequency of the network |
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Definition
| up to 216MHz = 5. up to 300MHz=6, then add 1 for each 100MHz |
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Term
| Video Carrier Level Stability (24-hour ) test |
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Definition
| Performed twice a year in the coldest and warmest times of year |
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Term
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Definition
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Term
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Definition
| a spectrum analzer feature that allows the user to make otherwise intrusive FCC POP tests in a non-intrusive manner |
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Term
| The FCC requires that the audio carrie frequency for each channel must be ---- above the video carrier frequency +\- |
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Definition
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Term
| Comcast maximum level at STB analog is? |
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Definition
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Term
| the visual signal level on each channel, as measured at the end of a 30 meter drop must not vary more than ? |
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Definition
| 8 dB within any 6 month interval |
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Term
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Definition
| 3 dB of the visual signal level of any visual carrier within a 6MHz nominal frequency seperation |
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Term
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Definition
| the RMS voltage of the aural signal must be maintained between 10 and 17 dB below the associated visual signal level |
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Term
| Comcast audio to visual carrier level |
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Definition
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Term
| video signal change variation-- max variation from the video carrier levels of non-adjacent channels (in dB) |
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Definition
| up to 300MHz is 10 add 1 for each 100MHz..example up to 600 MHz = 13 |
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Term
| The FCC requires that In-channel response must be within |
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Definition
| +/- 2dB or 4 dB peak to valley |
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Term
| Carrier to Noise test. The FCC requirement at each test point |
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Definition
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Term
| Coherent Disturbance test- Composite second order(CSO) |
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Definition
| + or - .75 and 1.25 above and below frequency |
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Term
| FCC requires that coherent disturbance must be at --- below the disired carrier level? |
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Definition
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Term
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Definition
| at least 18dB between any 2 ports on a d/c tap feeding the subscriber terminal on th TV |
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Term
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Definition
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Term
| signal leakage test-- Below 54 MHz and above 216 MHz |
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Definition
| up to 15 micovolts per meter at 30 meters |
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Term
| Signal level test- Between 54 and 216 MHz |
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Definition
| up to 20 microvolts per meter at 3 meters |
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Term
| What is the function of the video bandwidth filter on a spectrum analyzer? |
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Definition
| Takes the RF energy that has already passed through the RBW filter and the detector and smoothes it out |
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Term
| which of the following is considered a headend FCC POP test? |
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Definition
| Differential Gain and Differential Phase ( Color Performance test) |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Fiber lengths, faults, splices, breaks, attenuation, connector loss |
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Term
| what information makes cable plant testing much easier |
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Definition
| size, distance, type, documents |
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Term
| After cleaning the connector, how do you ensure that it stays clean? |
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Definition
| Cover it (cap) or plug it in |
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Term
| Which type of splice has the lowest loss |
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Definition
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Term
| What causes more injuries than the glass when splicing an optical fiber |
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Definition
| the edges of the protective armor |
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Term
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Definition
| Safe as long as they are not disassembled (CD ROM) |
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Term
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Definition
| Eye hazard if beam is viewed (bar code scanner) |
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Term
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Definition
| eye hazard if collected or focused on eye ( laser pointer) |
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Term
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Definition
| Eye hazard if the direct or reflected beam is viewed |
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Term
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Definition
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Term
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Definition
| the center of the fiber 8-10 microns in diameter |
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Term
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Definition
| a photo diode used to detect light from an optical fiber and convert the light to an electrical source |
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Term
Typical fiber loss for 1310 nm and
1550 nm |
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Definition
| 0.35dB/km 1310nm and 0.25dB/km 1550 |
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Term
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Definition
| Fusion 0.1dB--- Mechanical 0.25dB |
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Term
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Definition
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Term
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Definition
| Depends on the percentage of light availble- percentages equal 100 |
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Term
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Definition
| Method of joining 2 optical fibers of the same type using an electrical arc to form a percision splice |
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Term
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Definition
| Is temporary and used only in restoration |
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Term
| Wet Method for cleaning connectors and receptacles |
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Definition
| Use lint free wipes or lint free swabs or urethane foam head with 90% isopropyl alcohol |
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Term
| WDM ( Wavelenght Division Multiplexing) |
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Definition
| Enables different wavelenghts to be carried on a single optical fiber |
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Term
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Definition
| An electronic or optical process that combines several individual signals or wavelenghts into a single carrier or path |
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Term
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Definition
| Headend, Hubs and OTNs, Node return transmitters |
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Term
| DWDM ( Dense wave division multiplexing |
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Definition
| Allows multiple wavelenghts above and below a center wavelength to be carried on a single fiber |
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Term
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Definition
| Provides the means to modulate the RF tv carrier on to a coherent beam of light. |
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Term
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Definition
| Where the information modulated on the downstream and upsteam light carriers are recovered |
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Term
| Optical power levels at the receiver should be close to |
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Definition
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Term
| Fiber node- optical receiver |
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Definition
| Consist of an optical receiver that converts ligh back to RF in order to serve the customers in the area. |
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Term
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Definition
| is considered and interface between the headend or hub and the RF plant |
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Term
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Definition
| can correlate what it sees in the backscattered light with an actual location of an EVENT in the fiber |
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Term
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Definition
| Connectors and splices are called events |
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Term
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Definition
| you need a long length of fiber 17 to 1700' because of the resolution of the meter, to see events that are close together |
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Term
| Reverse spectrum RF frequency for Comcast's new or upgraded systems |
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Definition
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Term
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Definition
| Used to split/combine the forward and reverse spectrums |
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Term
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Definition
| Assigning a specific value to each of the samples |
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Term
| How many different phase states are there with QPSK modulation |
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Definition
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Term
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Definition
| Terminates, manages,and translates high speed internet sessions between cable modems |
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Term
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Definition
| A signals ability to be transmitted from one cable or device to another cable or device, measured in dB |
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Term
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Definition
| Optical transmission is a fast,cost effective, reliable and user- friendly transportation medium |
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Term
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Definition
| the RF carriers are modulated onto an optical carrier and sent via an optical fiber to the node. |
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Term
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Definition
| The optical carrier is received and demodulated, the RF channels are recovered and then delivered ot coaxial cables |
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Term
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Definition
| the signals are separated by another diplex filter and are routed to a transmitter that modulates the return signal into light. the light is injected into the fiber and travels back to the headend. at the headend they are received and de-modulated back to RF |
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Term
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Definition
| connects each of the nodes to the headend over a single path |
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Term
| Port-to-port isolation of 25dB helps reduce what |
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Definition
| interference generated by adjacent channel devices that may be connected to them |
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Term
| Digital Conversion- analog to digital conversion(ADC) |
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Definition
| Sampling, Quantization, Encoding |
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Term
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Definition
| is the measuring of the analog signal at specific intervals |
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Term
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Definition
| the process by which these specific values are converted into a data or bit stream |
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Term
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Definition
| Digital modulation scheme that changes phase and the amplitude |
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Term
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Definition
| Signals must be sampled at twice the highest frequency for proper recreation |
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Term
| How many phases are there in QAM? |
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Definition
| 4 (0/360,90,180, and 270) |
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Term
| 3 types of optical transmitters used in HFC networks? |
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Definition
Fabry-Perot (F-P)
Distributed Feedback (DFB)
Yttrium-Aluminum-Garnet (YAG) |
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Term
| Type of fiber optic cable used in the broadband industry? |
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Definition
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Term
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Definition
| The difference in signal level between the two output ports with the input port terminated |
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Term
| Which architecture offers the highest level of reliability |
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Definition
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Term
| What is 7 equal to in binary |
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Definition
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Term
| Why is 16 QAM a faster modulation technique than QPSK |
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Definition
| Four amplitude levels ( 2 above and 2 below each axis) are used |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Fibers are contained in a plastic tube much larger than the optical fibers, The fibers can move freely within the tube |
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Term
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Definition
| Color-coded tubes that house and protect the optical fibers within a fiber optic cable |
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Term
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Definition
| Consist fo buffer tubes surrounded by a fiberglass wrap and two steel strength members on each side molded into the jacket |
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Term
| Comcast allows for ---- of loss through a fusion splice? |
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Definition
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Term
| Two methods of cleaning optical fiber |
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Definition
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Term
| Dry wipe cleaning tape dispensers are used to clean? |
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Definition
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Term
| Dry cleaning wands are used to clean? |
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Definition
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Term
| Types of optical amplifiers |
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Definition
EDFA ( Erbium-doped fiber amplifier)
YEDFA ( Ytterbium Erbium doped) |
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Term
| 3 types of Optical power meters |
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Definition
Silicon (Si)
Germanium (Ge)
Indium-Gallium-Arsenide (InGaAs) |
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Term
| Optical Power is measured in? |
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Definition
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