Connectionoriented service

© 2004 Cisco Systems, Inc. All rights reseda. BCRAN v2.1—8-2

Frame Relay is an International Telecommunication Union Telecommunication Standardization Sector (ITU-T) and American National Standards Institute (ANSI) standard. Frame Relay defines the process for sending data over a public data network (PDN). As a next-generation protocol to X.25, it is a connection-oriented data-link technology that is streamlined to provide high performance and efficiency. Frame Relay relies on upper-layer protocols for error correction and more dependable fiber and digital networks.

The connection between the customer and the service provider is known as the User-Network Interface (UNI). The Network-to-Network Interface (NNI) is used to describe how different Frame Relay service provider networks connect to each other. ATM is the technology commonly used within the network of the service provider to carry Frame Relay data. However, regardless of the technology that is used inside the cloud, the connection between the customer and the Frame Relay service provider is still Frame Relay.

Note that Frame Relay defines the interconnection process between the customer premises equipment (CPE, also known as DTE), such as a router, and the local access switching equipment of the service provider (known as DCE). Frame Relay does not define how the data is transmitted within the Frame Relay cloud of the service provider.

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