A DVR System may stand without audio recording but we cannot call a system a 'DVR' without video recording. Hence the name Digital VIDEO Recorder.
The BNC video input ports serve as gateways of video signals from the analog cameras to the DVR System - for later recording and management. As for the DVR Cards for PC-based Systems, they may come built-in on the DVR Card or separated by DB25 video cables as shown in the above image. The same thing goes for the Standalone Systems, the BNC ports may be built-in on the unit found at the back panel or separated by DB25 video pigtails.
There are various reasons why we have these 2 different BNC port standards. Some installers prefer the built-in type due to durability concerns. They find the video cables easy to wear and tear over the months which will apparently call for replacement and they consider it costly. Another issue is the labeling on the video cables. Video cables that are poorly labeled may cause confusion should the labels be erased over their use. They may re-label them but it will look unprofessional and it's unacceptable. So their last resort is again to replace the video cables.
Others, however, consider the pigtail-type more advantageous. For the DVR Cards, they believe that replacing the video cables is better and a lot easier than having to remove the entire DVR Card from the system to check the issue on the BNC ports. They will need to repair the hardware which will most probably leave unnecessary marks on the affected portion in the board. All the worse, the unit will be called for RMA. Now with the Standalone Systems, the ones that make use of video cables are obviuosly more compact. They are smaller in size since the supposed space for built-in BNC ports has been saved leaving a single DB25 port. Smaller size means lighter weight; and lighter weight means lower shipping cost per unit.
Now what do you think? Will you go for built-in or pigtails?
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