Spectrum Field Technician 1 Test Questions and Answers

Spectrum Field Technician 1 Test Questions and Answers 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