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NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access 01

This is NE40E-M2 V800R010C10SPC500 Configuration Guide - WAN Access
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Introduction

Introduction

A conventional wide area network (WAN) uses X.25, frame relay (FR), or ATM. Any of these link-layer protocols can transmit data from one local area network (LAN) over a WAN to another LAN. As terminals become intelligent and the quality of physical links improves, the functions of error control and flow control for data at the data link layer on X.25 networks are no longer required. In addition, limited bandwidth resources on X.25 networks cannot meet requirements of users for services. ATM ensures high-quality service transmission, and therefore is widely applied to links that require high bandwidth.

Currently, ATM is used at the data link layer. Based on packet switching, ATM inherits high-speed circuit switching to provide a universal connection-oriented transfer mode suitable for various services. This allows multiple upper-layer protocols (currently only IPoA) to be carried on ATM networks.

ATM is connection-oriented. ATM connections are logical connections, called virtual circuits (VCs). Each VC is identified by a virtual path identifier (VPI) and a virtual channel identifier (VCI). A pair of VPI/VCI takes effect only on one segment of the link between ATM nodes. Each ATM node maps the VPI/VCI values to a specific address. When an ATM connection is released, the VPI/VCI values for the connection are also released, and can be used by a subsequent connection.
NOTE:
Currently, ATM interfaces support only permanent virtual circuits (PVCs).
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Updated: 2019-01-02

Document ID: EDOC1100058399

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