The Frame Relay

Frame Relay

Frame Relay: Frame Relay (or Frame-mode Bearer Service) is a frame relay communication technique for virtual circuit networks, introduced by the ITU-T from recommendation I.122 of 1988. It consists of a simplified form of packet switching technology that transmits a variety of frame sizes or frames ("frames") for data, perfect for the transmission of large amounts of data.

Image result for frame relay The Frame Relay technique is used for a high-speed voice and data transmission service that allows the interconnection of geographically separated local area networks at a lower cost. Frame Relay provides connections between users through a public network, in the same way as a private network point to point, this means that it is connection oriented. The connections can be of the permanent type, (PVC, Permanent Virtual Circuit) or switched (SVC, Switched Virtual Circuit). For now only the permanent is used. In fact, its great advantage is to replace private lines with a single link to the network. The use of connections implies that the nodes of the network are switches, and the frames must arrive ordered to the recipient, since they all follow the same path through the network, can handle both data and voice traffic. Image result for frame relay When contracting a Frame Relay service, we contract a certain bandwidth in a certain time. This bandwidth is known as CIR (Committed Information Rate). This speed, arises from the division of Bc (Committed Burst), between Tc (the time interval). However, one of the characteristics of Frame Relay is its ability to adapt to the needs of the applications, being able to use a higher speed of the contracted at specific moments, adapting very well to traffic in bursts. Although the average traffic in the interval Tc should not exceed the amount stipulated Bc.

When contracting a Frame Relay service, we contract a certain bandwidth in a certain time. This bandwidth is known as CIR (Committed Information Rate). This speed, arises from the division of Bc (Committed Burst), between Tc (the time interval). However, one of the characteristics of Frame Relay is its ability to adapt to the needs of the applications, being able to use a higher speed of the contracted at specific moments, adapting very well to traffic in bursts. Although the average traffic in the interval Tc should not exceed the amount stipulated Bc.

These Bc bits will be sent transparently. However, it is possible to transmit over the contracted CIR, through the Be (Excess Burst). These data that exceed the hired, will be sent in best-effort mode, activating the DE bit of these frames, which will be the first to be discarded in case of congestion in any node. The previous class our mountain teacher gave us: this class LAN networks can connect to each other through telephone lines and radio waves. A system of LAN networks connected in this way is called a WAN, the English acronym of wide-area network, wide area network.