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  • SML

    xDSL

     Introduction

     

    Digital Subscriber Line, DSL is the technology combination uses traditional telephone line as the media to transmit data, includes HDSL, ADSL, ADSL2+, VDSL, VDSL2,…etc, so called xDSL technology. They majorly differ in data rate and transmission distance. DSL supported asynchronous and synchronous mode over traditional POST and ISDN subscriber networks. It solves the bottleneck of the last mile communication between service provider and subscribers. Leveraged the wider spreading of telephone subscribers and telephone line installation, DSL technology is becoming the most important and potential technology applied in many countries all over the world.

     

     Standard

     

    ADSL standards was published by ITU-T :
    – G.994 Handshake procedures for DSL
    – G.992.1 (G.dmt) Annex A, B and C
    – G.992.2 (G.lite) Annex A and C
    – ANSI T1.413
    – G.992.3 ADSL2 Annex A, B, C, J, L and M
    – G.992.5 ADSL2+ Annex A, B, C, J and M
    – G.993.1 VDSL
    – G.993.2 VDSL2
    – G.993.5 G.vector
    – G.998.1 ATM bonding
    – G.998.2 PTM bonding
    – G.998.4 G.INP
    – G.9700/01 G.Fast

     

     Application

     

    Outside connection of local network
    Comercial website building up
    Integrated with Video conference setup
    Wireless internet access
    Connection with IP-VPN network building up

     

     Architecture