NCTI ROC II BOOK II FINAL Test 1

NCTI ROC II BOOK II FINAL Test 1 When pressure testing a drop system to check for leakage, What must be done before applying the test signal? - ANSWER The technician must isolate the drop system from the hybrid fiber/coax (HFC) network by disconnecting the drop at the distribution tap. Why do some leakage detection systems utilize a leakage carrier modulated with a tagging signal? - ANSWER To avoid false detection of leaks. When all three sections of a pulse code modulator (PCM) are combined, what function can be performed? - ANSWER · As an analog-to-digital converter (ADC) What prevents the subcarriers in orthogonal frequency division multiplexing (OFDM) from interfering with each other? - ANSWER · The peak power of each subcarrier aligns with the minimum power of the adjacent subcarrier. What two significant signals go into the mixer to create the intermediate frequency (IF)? - ANSWER · The RF signal frequency at the output of the front-end filter and the local oscillator (LO) signal.