Spectrum Field Technician 1 Test Questions & Answers 100% Correct

Decibel (dB) - ANSWER-Relative # of signal gain or loss through a device or cable. Decibel millivolt (dBmV) - ANSWER-Absolute # of signal strength. Foreign voltage detector (FVD) - ANSWER-Detects unwanted voltage on cables/strands; test on plastics too. Data Over Cable Service Interface Specification (DOCSIS) - ANSWER-The international standard for adding high-bandwidth data to an existing cable system. What does SAFE stand for? - ANSWER-Stop. Assess. Focus. Eliminate. What does NCP stand for? - ANSWER-Next. Channel. Pointer. What does SLM stand for? - ANSWER-Signal. Level. Meter. What is a signal level meter? - ANSWER-Tool used to run multiple tests involving signal level, MER, BER and noise level. What does CNR stand for? - ANSWER-Carrier to Noise Ratio. What is the purpose of CNR? - ANSWER-Comparing level of desired signal to level of background noise. What is Hum modulation? - ANSWER-The distortion of both cable video and audio. How can you identify video hum? - ANSWER-Visually seeing single (60Hz) or double (120Hz) horizontal bars rolling slowly up from bottom to top of television. How can you identify audio hum? - ANSWER-By physically hearing a buzzing sound. what does BER stand for and what does it do? - ANSWER-Bit. Error. Ratio. Overall measure of data quality of the received bit stream. Consequences of BER (2 things). - ANSWER-1.) Video: picture fails 2.) Data: loss of dial tone What is the max length of a ground wire? - ANSWER-20 feet (want the wire as short as possible). What causes high BER (3 things)? - ANSWER-1.) Ingress: poor connections 2.) Distortion: undesired change in electrical signal 3.) Noise: unwanted disturbance to a desired signal What is the desired BER level? - ANSWER-1.0E-9 What does MER stand for? - ANSWER-Modulation. Error. Ratio. How many channels can go into a QAM? - ANSWER-8-12. What do QPSK, 16QAM, 64QAM and 256 QAM have in common? - ANSWER-They are phase shifted 90 degrees apart. What is Egress? - ANSWER-Crap coming out of our system. What is Ingress? - ANSWER-Crap coming into our system. What does DOCSIS do? - ANSWER-Permits high-bandwidth data transfer to a cable TV system.