Field tech 1 Questions and Answers 100% Pass

Field tech 1 Questions and Answers 100% Pass Upstream frequency ranges between 5Mhz and 42Mhz Downstream frequency ranges Between 50MHz 860MHz Upstream frequency ranges 5MHz and 42 MHz A 6 MHz downstream channel can hold 2-4 hd channels or 8-12 standard definition channels Egress When a signal leaks out of a cable Ingress when a signal leaks into a cable Field technicians are responsible from The tap to the CPE (customer premise equipement) The most preferred BER is measured in ________ and is shown as _______ Billions, 1.0E-09 The headend Is the master facility for distributing signals over a cable television system Charter passing modem receive levels (Rx) between -10dBmv and +12dBmv Charter passing modem transmit levels (Tx) between 35dBmv and 50dBmv Charter passing MER 35dBmv HD channels around 10Mbps each standard definition channels around 3-4Mbps each QAM (qaudarature apmlitude modulation) two amplitude modulated waveforms at the same frequency that are phase shifted by 90 degrees QPSK (qaudrature phase shift keying) 16 QAM, 64 QAM, and 256 QAM are all exapmples of QAM modulation. RF loss or gain is a relative measurement and is measured in dB (decibels) RF measurements that are read from a meter are absolute measurements and are measured in dBmV (decibels per millivolts) Analog signal loss is often gradual and reduces signal slowly Digital signal loss sudden where very small margin exists for difference between a good picture and no picture (called the cliff effect) FM