Chapter 6. WAN

Frame Relay

Local Management Interface (LMI)

Connection between customer (data terminal equipment, DTE) and service provider (data communications equipment, DCE) is known as User-Network Interface (UNI). It is in this area where Frame Relay operates. The Network-to-Network Interface (NNI) is used to describe how different Frame Relay provider networks interconnect. Providers often use ATM in the cloud to carry the Frame Relay data.

Frame Relay multiplexes many virtual circuits (VC) over a single physical transmission link. It uses data-link connection identifiers (DLCI) on each DTE to identify the different virtual circuits. The DLCI is typically only locally significant between the DTE and the frame switch. Some providers allow ...

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