In the past few years CCTV has become quite popular and most people are using it to enhance security in their business premises or homes. They are also used in train stations, airports, major highways and many other public places. In they known as closed circuit television camera and they give video surveillance. No one will dare […]

First defined in 1988, the ISDN standard (which stands for Integrated Services Digital Network) was established to carry voice, video, data and other network services on the traditional telephone company network.  ISDN is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public