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Fault Tolerance

A way to provide redundancy in hardware systems to protect against failure of one of the redundant systems or components.


Federal Communications Commission
The regulatory agency established in the United States for all interstate radio and electronic communications.

Flow Control

In data communications, flow control is the process of managing the rate of data transmission between two nodes to prevent a fast sender from overwhelming a slow receiver.


A logical grouping of information sent as a link layer unit over a transmission medium. The terms packet, datagram, segment and message are also used to describe logical information groupings.

Frame Relay

An efficient packet switching technology providing high speed frame or packet transmission with minimum delay and efficient bandwidth utilization over virtual circuits. The link layer handles much of the network layer functionality. It has less protocol overhead than X.25.


At the physical and data link layers of the OSI model, bits are fit into units called frames. Frames contain source and destination information, flags to designate the start and end of the frame, plus information about the integrity of the frame. All other information, such as network protocols and the actual payload of data, is encapsulated in a packet, which is encapsulated in the frame.

Full Duplex

A circuit or device permitting transmission in two directions (sending and receiving) at the same time.