Installing DVR with BNC cameras to access remotely?

[seriousfew 0]

I see some DVR's that have BNC inputs/outputs and also one RJ-45 port to connect to a switched network. Can you access all cameras(BNC) remotely with such a DVR? If so, then how is an NVR that uses RJ-45 exclusively, instead of BNC input/output, ports to connect cameras any different?

[jazzar 0]

Standard bnc inputs only provide a basic standard composite tv video signal.

the IP network cameras scan the image and produce digital data that can be sent to any device that it connects to. the quality can range from hd to megapixel types (2meg is equivalent of about 5 cameras)- 35meg used at football grounds and they can zoom in on a face from across the opposite end of the stadium from 300m

You don't need all the cables from ip cameras to come back on individual cables to the recording point. 1 cable can run from the dvr to a switch then one cable from this switch can be run to the next switch and so on then each switch can have multiple cameras attached so all camera data will run down the main cable linking both switches together. Also anyone who connects to the network can view the cameras you don't need to run coax cables to every monitoring position.

Result is a CCTV system can be installed on existing data cabling providing it can handle the high data rates of streaming video and anyone with the software on their pc can access the images.

see;-

http://www.jansenelectronics.net/shoppingcart/pages/Analog-Vs.-Megapixel-IP-Cameras.html

for more info