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ページを印刷するWiring using CAT5 Cable
CAT5 cable consists of 4 pairs of twisted wires. For this to provide the required
interference shielding, it is important that one wire in each pair for audio and
video is a ground wire. As with the screened cable, it is also important to double
up the conductors for the Ground and B+ (power) lines as shown:
In some installations the +14V power required for each indoor monitor can be
provided from a central place near the door unit. This can make for a neater
installation, but increases the voltage drop by a factor of two as the power needs
to run all the way up to the monitor and then back to the door camera unit. You
can use the spare conductor pair from the previous diagram to run the 14V signal
to the back of the monitor. Note that the ground side of the power adaptor is
connected to the ground signal from the camera, saving a conductor and allowing
both conductors to carry the +14V.
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