ADSL ADSL internet

ADSL XDSL ADSL, G.lite , SDSL , IDSL , HDSL , VDSL , RADSL , VoDSL , Wireless DSL , Satellite DSL ADSL xDSL 2 Asymmetric Symmetric

Asymmetric upstream downstream ( download upload ) Symmetric 2

ADSL ?ADSL (Asymmetric Digital Subscriber Line) () ADSL ADSL ADSLADSL XDSL Server (Downstream) Server (Upstream) 64 Kbps - 8 Mbps 64 Kbps - 1.5 Mbps(, ) ADSL (Modulation) 2 CAP (Carrier Amplitude/Phase) modulation DMT (Discrete Multi-Tone) Modulation 2 3 (POTS)

ADSL TCP/IP Protocol Protocol Internet ATM ADSL Application Multimedia

Multi-Service Tele Education Fast InternetDistance Learning Telecommuting News ClippingNear VDO On Demand Entertainment on Demand

Multi-service Fast Internet Education

Multimedia Online 24

dsl dsl 1. ISP internet ISP dsl packet 2. dsl UCOM Online , Qnet ( Lenso) , TA Express , , TOT TA TOT TA 3. dsl dsl 2

Dialup ISDN ADSL Cable SatelliteRateadaptation

++ + ++ + +

Security ++ ++ ++ - -Always On - - ++ ++ ++

ADSLInvestment - - ++ ++ ++ +

Bandwidth - - ++++ ++ ++ ( : ADSL Forum

)

** modem spec dsl modem ISP dsl ****

300/1 . 20 10900.0-2938-6583 ,0-2938-6239 0-2938-6239Hotline : 081-499-1807, 081-916-5773 , 089-005-3124

www.jodoi.com