IP Video

Network camera: Advantages over an analog camera-based system

Network Camera Based System	Analog Camera Based System

	Network Camera System	Analog Camera System
Access	As open or closed access as needed. Remote access to live images and remote administration of a network camera are possible from anywhere using a standard Web browser on any PC.	Closed circuit. No possibility for remote access.
Ease of Use	- You can administer and view the images remotely using a standard Web browser on any PC. - Images can be recorded on a hard disk, enabling easy search possibilities, easy storage and no image degradation or wear. - The hard disk can be located at a remote location for security purposes.	- Remote administration or monitoring is not possible. - Images must be stored on video tape cassettes, which require constant changing and lots of storage space. The quality of recorded images deteriorate over time. - The video cassette recorder must be located near the camera. This could potentially enable unauthorized persons to have access to the video tape.
Quality	Digital images do not lose quality in transmission or storage. A digital picture is created using Motion-JPEG. Once created, the image is free from degradation. Each frame within a video stream is sharp.	Image quality is lost when using long cables and the resolution of a magnetic tape is normally quite low. In addition, the quality of the recorded video deteriorates over time.
System Requirements	Everything needed to stream live video over networks is included in the network camera. Simply connect the network camera to a network. View, record and administer from any networked PC (located anywhere).	Connection to a coaxial cable, to a multiplexer, to a video or time lapse recorder, and to a locally placed CRT (cathode ray tube) monitor.
Installation	Simply connect a network camera to the nearest network connection and assign an IP address.	Attach a coax cable to each and every camera and connect to the multiplexer.
Cabling	One standard UTP (unshielded twisted pair) network cable can forward images from hundreds of network cameras simultaneously.	One cable can transport video signals from only one camera at a time. If you have two cameras, you have to have two cables. This often means large cable trunks filled with thick and sensitive cables that are connected to a locally placed control room.
Scalability	Adding more network cameras to the system is easy.	Very difficult. Each analog camera requires its own cable. Image quality is lost when using long cables.
Cost	A high quality network cable typically costs 30 to 40 percent less than a standard coaxial cable. A network cable can also support hundreds of network cameras and other devices. An IP-based network infrastructure is often already in place, which means the cost is reduced to only that of the network camera(s).	Expensive coaxial cables. A classic RG59 75 Ohms coaxial cable typically costs 30 to 40 percent more than a high quality network cable. In addition, more cable is required. Each analog camera requires its own cabling. High labor and maintenance demands, plus cost of the analog camera(s), video tape recorder and video tape cassettes.

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For more details, see:

* Inside a network camera
* Advantages over a PC-based cameras
* Advantages over an analog camera-based system
* Ten reasons to buy a network camera (pdf)

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*Content courtesy of Axis Communications

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