Criticality of a Network Design in a CCTV Security System
For any CCTV Surveillance Security System, deployed in large industrial setups- the role of network design is very important, as it is design of the system which decides the performance of overall Camera Security System, rather than the quality or specifications of individual camera itself. I am not saying that we should ignore the specifications of camera in such a case, but it is like in a class a highly qualified professor gives his best lecture to the students, but due to large size of class, his voice is not reaching all his audience. In such a case, it is not the professor who is giving a bad lecture, but his lecture will still be perceived as useless for students at the back, as his voice is not reaching to the last student of the class.
So finally it comes again to the overall team effort of all the devices and components of a CCTV Security System. And network design plays it crucial contribution in it.
Thus we shall start with discussing the various types of topologies in which various devices of the CCTV System are connected generally in industry to make the overall network. There will also be crucial role of switches deployed and its bandwidth available depending in the number of cameras, but we will limit our discussion in this post to types of network topologies in a CCTV Security System.
Types of Network Topology in a System Design
- Bus Topolgy:-
- Ring Topolgy:_
- Star Topology:-
- Mesh Topology:-
This types of topology comes handy when there is already a backbone of optical fiber cable around the perimeter of a premises, as all the devices/cameras in our case are connected to the network through this common backbone. Although it is the simplest way to design the network of a CCTV System, but problem with a Bus Topology is that there is a lot of dependency on the status of the backbone employed in the network. Diagram below shows the indicative representation of a Bus Topology.
As the name suggests, the geometric arrangement of the devices in this case is such that every device is connected in a ring making a closed logical loop in the network. Every device receives the signal first and then transmits it further to the other device. No of networking devices in this case are increased in terms of Light Interface Units for splicing, pigtails switches etc.
This types of topology in generally used when there is small premises and cabling required is less, as all the devices are networked to a central hub or a core switch directly. In this case network failure for one device does not affect the other devices.
Mesh Topology is generally not used in a CCTV network considering high usage of cables in it. Principally in this topology all the devices are connected to each other, giving a lot of redundancy to the network.
From the above types of topologies, there is no absolute right or absolute wrong topology. It totally depends on the site condition, budget available, availability of cable route, criticality of the network that decisions are taken accordingly. And one particular topology or a combination of different topologies can be used.