c. telegraph carrier, teletypewriters, telephone carrier, and telephones.
d. teletypewriters, telephone carrier, telephones, and telegraph carrier.
6. It is characteristic of a frequency-division-multiplex carrier system that each channel
a. uses a discrete wire pair.
b. operates on a separate and discrete frequency.
c. uses a common carrier frequency for modulation of all channels.
d. shares the line with every other channel in the system on a time-sharing plan.
7. The practical limit to the number of channels that can be transmitted by a telephone carrier system over a
landline or cable is the
a. total attenuation of the cable.
b. output power available from the terminals and repeaters.
c. overall frequency response of the cable and its facilities.
d. number of repeaters needed to compensate for line attenuation.
8. When a multichannel telephone carrier signal is placed on a radio system, the bandwidth that the signal
occupies in the radio spectrum depends on the
a. number of carrier channels in use.
b. power in each telephone carrier channel.
c. stability of the radio system oscillators.
d. stability of the channel carrier oscillators.
9. One characteristic of a frequency-division-multiplex receiving channel is that
a. all carrier frequencies are higher than 3,500 Hz.
b. filters are not required for channel separation.
c. the equipment is channelized by means of a sequential pulse pattern.
d. the demodulating carrier frequency must be as close as possible to the modulating carrier frequency.
30
Previous Page
