You want to migrate an analog videosurveillance system to Ethernet/IP . In order to do so you must on the hand install the network cameras for the new extensions, on the other hand for the analog existing cameras you must make a choice between :
- encoding your analog video with an IP encoder,
Concerning the transportation of the video signal, there are three cases possible (to simplify wireless networks will not be discussed) ;
- the videosurveillance infrastructure is 100% fiberoptic,
- your videosurveillance infrastructure uses coaxial cables
- your videosurveillance infrastructure consist of both fiber optic and coaxial cables
1- Fiber optic IP videosurveillance
This is a fairly classical case as we have to transport an IP signal on a fiber optic cable. A change simply has to be made to the optical interfaces already in place for your analogical videos can be put to one side (they can always be used for another installation)
Here, no need to relay new cables. The existing fiber optic infrastructure can be used if it is still in good confition of course.
The products are fairly well-known(click on the link gamme UTC to see the product) :
- média converter 10/100Base Tx to 100Base FX
In general, distance is not an issue except when using a gigabits or more.
2- IP videosurveillance using copper cables (twisted pair and coaxial cable)
To start with your analogic videosurveillance system was on a coaxial cable infrastructure. Now, that you have move to an IP network, you have to relay Cat 5 type cable or higher, and the maximum distance is 100 m (for the 10BaseT and for the 100Base T and for the 1000BaseT this is also the case.
There are two things to note:
* For short distance - less than 100 m, use Cat5 or superior type cable
* For distances over 100m use fiber optic cables or add a switch in order to resend the IP signal.
The existing coaxial network is no longer at any use, what a shame...
Fortunately, a means exists whereby the coaxial network can be put pack into use. Thanks to VDSL2 technology, it's possible to transmit a VDSL2 signal on a coaxial cable. A VDSL2 coder/decoder is all that is required. Using the existing coaxial network avoids the need to create a parallel Cat5 network and the existing coaxial network allows the signal to be transmitted at distances superiour to 100m. In fact, VDSL2 products allow for over 15MBs to be transported over distances up to 2400m (50 or 75 Ohms). They have been tried and tested with sucess on France's national train (SNCF) and Paris' public transport (RATP) companies' networks.
UTC Fire & Security, offer this type of product in PoE (IEEE802.3af) or compatible rackable chassis versions (IEEE802.3af) :
- MCR200-1T/1CX (rackmount version MCR-R15)
- MC251-4T/1CXT ( 4 ports 100BaseT)
- MC251 -4P/1CXT (4 ports PoE 100BaseT)
Bearing in mind that I beleive that seeing is understanding :
I hope this blog has been of use to you. It is, of course, voluntary simplified and not at all in Depth, sorry to those who are left waiting more.
I just want to explain how an existing coaxial network can be reused even when waving goodbye to analogic systems- and isn't that better for the planet too?
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