BT Technology Journal
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Video has been carried over both the analogue and digital networks for many years. The transport of uncompressed ‘raw’ video has historically been very bandwidth intensive, particularly video used for broadcast and television. The advent of digital video and the compression schemes that allows its transport over ever more modest bandwidths has made the transport and delivery of video a small business and consumer reality. PSTN and ISDN videotelephony (which are circuit-switched networks) have been with us for a number of years but have never really enjoyed widespread take-up. The availability of the Internet (a packet-switched network) and the advent of increasingly lower cost bandwidth and broadband access are changing the way in which video can be transported and used.