ISP Technologies HDDS BRC1 User Manual
Page 7
Cat5 Connections
The figure below shows the connections for the Left and Right outputs. Connections
are done via standard Cat5 cables where pins 1 through 8 are connected common to
the same pins 1 through 8 at each end. As shown below two wires in the Cable are
used for balanced audio and 6 wires are used for power with two providing ground and
two for each of two 22VAC power signals fed down the cable.
NOTE: The HDDS rack mount Master Control Module feeds 22VAC over the
Cat5 cable and the HDDS BRC1 feeds +/-22VDC over the Cat5 cable. The
inputs of the HDDS speakers will accept either 22VAC or 22VDC to power the
onboard amplifiers.
Remote Level Control Connections
The figure below shows the connections used for the external Remote Zone Level
Control. The BRC1 feeds 10VDC down the Cat5 cable and sets the zone level based on
the DC Voltage that appears on pin 5 of the Cat5 cable. The level adjustment is done
with an internal Voltage Controlled Amplifier VCA, which means that a simple DC
voltage is used to set the remote level eliminating the need to feed low level audio
down a long run of cable.