Vdsl Overview - Huawei AR1200 series Configuration Manual

Huawei AR1200 Series Enterprise Routers
Configuration Guide - Interface Management

13.1 VDSL Overview

Based on the DSL, the Very high data rate Digital Subscriber Line (VDSL) integrates various
interface protocols multiplexes upstream and downstream channels to provide a high
transmission rate.
VDSL Introduction
ADSL provides limited bandwidth for image services at high costs, which hinders ADSL
development. VDSL is the most advanced digital subscriber line technology and further
improves the downstream bandwidth of the xDSL system.
VDSL System
As shown in
Multiplexer (DSLAM) and Customer Premises Equipment (CPE).
l
l
In the VDSL 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. VDSL
interfaces on the AR1200 are upstream interfaces.
Figure 13-1 VDSL system
Advantages of VDSL
Compared with ADSL, VDSL has the following advantages:
1.
Issue 01 (2012-04-20)
Figure 13-1, an VDSL system consists of a Digital Subscriber Line Access
A DSLAM is an aggregation device that terminates VDSL packets on the central office.
A CPE provides interfaces for users, modulates and demodulates data signals, and uploads
user data to a DSLAM.
NOTE
An AR1200 functions as a CPE.
Data transmission rate: ADSL provides the upstream transmission rate of 640 kbit/s to 2
Mbit/s and the downstream transmission rate of 1 kbit/s to 8 Mbit/s. VDSL provides the
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
13 VDSL Interface Configuration
121