Analog CCTV Video Surveillance

The Conventional CCTV System

Analog CCTV Systems usually consist of analog cameras, coax based wiring, and digital video recorders.  The lower cost to setup and maintain makes this technology a still popular choice among commercial and industrial organizations.

How it works

Analog cameras transmit a video signal to the video recorder via coaxial cables using traditional radio frequency (RF) technology.  It begins with a CCD sensor in the camera which digitizes the image for processing. But before it can transmit the image, it needs to convert it back to analog so it can be received by an analog device, such as a video monitor or recorder.  Unlike IP cameras, analog cameras do not have built in web servers or encoders.  Analog cameras require little technical maintenance.

Below is a simplified schematic of an analog system:

analog CCTV-System-Diagram

Highlights of Analog Systems:

  1. Analog CCD Cameras perform well across a variety of lighting conditions and manage motion well.
  2. Analog cameras allow us to use legacy cabling in existing structures. Surprisingly, coaxial wires are still very relevant. Cable, satellite and security companies continue using coaxial cables mainly because of their low video noise level.
  3. However, legacy cabling for analog cameras utilizing coaxial cables can be cumbersome.  Today, we also have an option using baluns’ to transmit analog video, power and data over a network wiring infrastructure and transmit the video and power well over a mile(on standard Cat5 cabling).
  4. Using coax wires greatly reduces the overall cost of cabling because cable manufacturers enhance the wire by tying it with additional strands (18/2), allowing it to transmit video and power in the same cable.
  5. Analog video traffic is not subject to networking issues or risks and require little to no network knowledge (just power, point, and focus).
  6. With no bandwidth requirement, Analog systems are exponentially scalable with minimal network concerns.
  7. Less maintenance—no IP traffic management, no programming, software, IT skills, etc.

Skynet Security Systems

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