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True network camera: |
PC Based Camera: |
| 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. |
- 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 deteriorates over time. |
| 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. |