Frame Relay Configuration; Frame Relay Terminologies; Overview; Dte, Dce, Uni, And Nni - 3Com MSR 50 Series Configuration Manual

8
Frame Relay
Terminologies

Overview

DTE, DCE, UNI, and NNI

Virtual Circuit

F R
RAME ELAY
When configuring frame relay, go to these sections for information you are
interested in:
"Frame Relay Terminologies" on page 235
■
"Frame Relay Configuration Task List" on page 238
■
"Configuring DTE Side Frame Relay" on page 238
■
"Configuring DCE Side Frame Relay" on page 245
■
"Displaying and Maintaining Frame Relay" on page 246
■
"Frame Relay Configuration Example" on page 247
■
"Troubleshooting Frame Relay" on page 252
■
"Frame Relay Compression" on page 253
■
Frame relay protocol is a simplified X.25 WAN protocol. It is a kind of statistical
multiplexing protocol that can establish multiple virtual circuits (VC) over a single
physical cable, each of which is identified by a data link connection identifier
(DLCI). A DLCI is not of global significance. It is valid to two directly connected
interfaces only. That is, you can use the same DLCI on different physical interfaces
to identify different VCs.
A frame relay network can be a public network, a private enterprise network, or a
network formed by direct connections between data devices.
Data Terminal Equipment (DTE) are end devices in frame relay networks. A frame
relay network provides the capability of data communications between end
devices.
Data Circuit-terminating Equipment (DCE) are network devices that provide
network access to DTEs.
User Network Interfaces (UNI) are interfaces used to connect DTEs and DCEs.
Network-to-Network interfaces (NNI) are interfaces used to connect frame relay
networks.
Virtual circuits fall into two types, permanent virtual circuit (PVC) and switched
virtual circuit (SVC), depending on how they are set up. Virtual circuits configured
manually are called PVCs, and those created by protocol negotiation are called
C
ONFIGURATION