The nuts and bolts of IP CCTV

October 30, 2009

Mark Harraway argues IP is here and offers more than hybrid or analogue systems here. Mike Tennent of Tavcom Training sets out the next part of his response below.

Let’s examine the basic operation of IP (Internet Protocol) and the terminology used for transmitting data and, in this instance, closed-circuit television across a series of cables, local area networks, wide area networks and indeed through the Internet.

IP generally uses a protocol called TCP which sends the information and data in ‘packets’. At their destination the receiver will then sent back to the transmitter an acknowledgement that it has received the information safely. The transmitter will then issue the next packet of data and await confirmation that it has been received before moving on to the next and the next … ad infinitum. This form of protocol is really quite impractical for sending CCTV images because each picture comprises such a vast amount of data that standard transmission lines currently used in networking are unable to adequately cope in real-time streaming terms. Instead we use another protocol called UDP which, quite simply, only sends the information to the receiver with no acknowledgement that it has been received safely and all in one piece.

To read the original “Dont Go Hybrid” article click here.

To read from the beginning of the Tavcom posts click here.

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