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Interoperation Configuration Guide

AR Router

This document provides cases for connecting AR enterprise routers to devices of other vendors.
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ARs provide a variety of WAN interfaces to meet customer requirements and can be connected to Digital Subscriber Line Access Multiplexers (DSLAMs) of multiple vendors. The primary/backup link scenario of xDSL (ADSL, VDSL, and G.SHDSL) low-speed links and 3G/4G wireless links is widely used.


ADSL is a data communications technology that enables fast data transmission over copper twisted pairs by employing high frequencies that are not used by regular telephone lines.


ADSL provides limited bandwidth for image services at high costs, which hinders ADSL development. VDSL is the most advanced digital subscriber line technology that provides high bandwidth for broadband services such as image services.


G.SHDSL is a data communications technology that enables faster data transmission over copper twisted pairs. G.SHDSL employs frequencies that include those unused by traditional Plain Old Telephone Service (POTS) to provide symmetric transmit and receive data rates.

Asymmetric Digital Subscriber Line (ADSL) is the most commonly used broadband access technology. It provides asymmetric transmit and receive data rates over copper twisted pairs and is useful for transmitting asymmetric services such as Internet access and Video on Demand (VoD). However, ADSL cannot meet requirements of commercial broadband applications that require bidirectional and symmetric traffic and are sensitive to performance fluctuation. The G.SHDSL technology solves this problem.

G.SHDSL complies with ITU Recommendation G.991.2 and provides bidirectional data transmission with symmetric data rates over twisted pairs. It reduces the transmission spectrum, improves the anti-noise performance, and extends the maximum transmission distance to 6 km by using 16-trellis coded pulse amplitude modulation (TCPAM).

xDSL System

As shown in Figure 1, a xDSL system consists of a Digital Subscriber Line Access Multiplexer (DSLAM) and Customer Premises Equipment (CPE).

  • A DSLAM is an aggregation device that terminates xDSL packets on the central office.
  • A CPE provides interfaces for users, modulates and demodulates data signals, and uploads user data to a DSLAM.

The router functions as a CPE.

In the xDSL system, downstream transmission refers to data transmission from a DSLAM to a CPE, and upstream transmission refers to data transmission from a CPE to a DSLAM. xDSL interfaces on the device are upstream interfaces.

Figure 16-1  xDSL system

Updated: 2019-05-17

Document ID: EDOC1100034005

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