In a cable broadcasting system of the invention capable of setting output or
stop
of broadcasting-signals from tap output terminals of a tap device in response to
a command signal transmitted by a center equipment, when demand for output setting
for many tap devices occurs, output setting of the corresponding tap devices can
be surely carried out without increasing the load on each power supply device for
supplying the tap devices in each district with electricity. When demand for setting
tap output of plural tap device occurs, a head-end controller reads output setting
data for all the tap devices which are the objects of tap output setting and transmits
command signals in order to tap devices at a rate of one tap device per each district
covered by a power supply device. The interval of transmission of command signals
to one district is controlled to be longer than or equal to the time tn
necessary for the tap device to which a command signal was previously transmitted
to finish tap output setting operation.
