deo frame are eliminated. DCT is an intraframe coding method. Interframe coding is also called spatial coding. inverse multiplexer Equipment that receives a high-speed input and breaks it up for the network into multiple 56- or 64 Kbps signals SO that it can be carried over switched digital service. The I-MUX supports the need for dialing over this network. It also provides the synchronization necessary to recombine the multiple channels into a single integrated transmission at the receiving end. This is necessary because, once the transmission has been subdivided into multiple channels, some parts of the transmission may take a different and longer path to the destination than others. This results in a synchronization problem even though the difference may be measured in milliseconds. The job of the I-MUX is to make sure that the channels are recombined into a Video Communication: the Whole Picture cohesive single transmission. Internet Protocol. Defined in RFC 791, the Internet Protocol is the network layer for the TCP/IP protocol stack. It is a connectionless, best-effort packet- switched delivery mechanism. By connectionless we mean that IP can carry data between two systems without first requiring their connection. IP does not guarantee the data will reach its destination; neither can it break large packets down into smaller ones for transmission or recover lost or damaged packets. For that it relies on the Transmission Control Protocol. Integrated Services Digital Network. ITU-T standard for a digital connection between user and network. A multiplicity of services, voice, data, full-motion video and image can be delivered. Two interfaces are defined, Basic Rate Interface, and Primary Rate Interface. Basic Rate Interface (BRI) provides two 64 Kbps circuit-switched bearer (B) channels for customer data and one 16 Kbps delta (D) or signaling channel that is packet-switched. The Primary Rate Interface (PRI) differs between the US and Europe: in Europe it provides thirty 64 Kbps B channels and two 64 Kbps D chan