Understanding Frame Relay
Frame Relay is a connection-oriented data-link technology that is streamlined to provide
high performance and ef?¬?ciency. For error protection, it relies on upper-layer protocols and
dependable ?¬?ber and digital networks.
Frame Relay de?¬?nes the interconnection process between the router and the local access
switching equipment of the service provider. It does not de?¬?ne how the data is transmitted
within the Frame Relay service provider cloud. Figure 8-21 shows that Frame Relay
operates between the router and the frame relay switch.
Figure 8-21 Frame Relay
Devices attached to a Frame Relay WAN fall into the following two categories:
?– Data terminal equipment (DTE): Generally considered to be the terminating
equipment for a speci?¬?c network. DTE devices are typically located on the customer
premises and can be owned by the customer. Examples of DTE devices are Frame
Relay Access Devices (FRAD), routers, and bridges.
?– Data communications equipment (DCE): Carrier-owned internetworking devices.
The purpose of DCE devices is to provide clocking and switching services in a network
and to transmit data through the WAN.
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