cctv cameras

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URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=107996
Printed Date: May 12, 2025 at 3:02 PM

Topic: cctv cameras

Posted By: markm
Subject: cctv cameras
Date Posted: October 08, 2008 at 4:11 AM

Dose anyone Install or have any experence with Security cameras I'v done a coply of systems. I have a board camera I took off the front of a customers house it has 8 dip switches on the back im not familiar with. it also some how use's one RJ-6 Line for power and signal can someone explain how this works or recommend a book. Thanks Mark

Replies:

Posted By: n2ixk
Date Posted: October 08, 2008 at 6:47 PM

Video is an AC signal, which can be "piggybacked" onto the DC power by using capacitors and inductors at each end of the system. The capacitors are used to block the DC from getting into the video circuitry while passing the video signals, and the inductors keep the high frequency video signals out of the power supply, while allowing the DC power to pass through.

Such a system will always result in lower video quality than using 2 separate cables for video and power. As such, it is rarely used on better quality CCTV systems. It is more often seen on low-end setups, intended for installation by DIYers.

Posted By: t&t tech
Date Posted: January 21, 2009 at 5:38 PM

did some cameras once for a restaurant, wasn't too bad for a first timer