ADSL and VDSL

•What are these technologies

•Speeds and restrictions

•Who supports VDSL

•Where will these technologies be used

•What is the future of ADSL and VDSL

ADSL

• Asymmetric speeds• Speed: Download: 1.5 Mbps – 6 Mbps

Upload: 16 – 640 kbps• Uses the current copper infrastructure of the

telephone network• For best performance: maximum distance of

18000 feet from the CO• Gives a designated line, in other words it is not

a shared line

Network Structure Of ADSL

VDSL

• Symmetric as well as Asymmetric Transmissions

• Speed: Download: 13 Mbps – 55 MbpsUpload: 1.5 Mbps – 26

Mbps• Uses Fiber Optic Cable: Copper should not

exceed 4500 feet form the CO for optimum performance

• Will use FTTC with ONU’s, (Optical Network Unit)

Network Structure of VDSL to Residents

Who is Who in VDSL

• There are two main groups that are trying to standardize VDSL

• VDSL Alliance made up of Alcatel and Texas Instruments : DMT modulation techniques

• VDSL coalition who is made up of Lucent and Broadcom : CAP and QAM modulation techniques

Where ADSL is used• Small to Medium Businesses • Residential • In the last six months there have been 6.8

million new subscribers worldwide

Where & What can VDSL provide

• Competitors are aiming toward multi-tenanted apartments

• Large Businesses • They even want to target rural areas as more

people work from home require high speed access

• Video on demand• Video conferencing and VoIP

• Japan has set a target date of the mid century to have 30 million households connected to high-speed access

• They will do this with Nippon Electronics Company, NEC• NEC believes in the technology of VDSL and has set out

to prepare for future markets• They have already have a pilot system in Japan’s Keio

Plaza Intercontinental Hotel

Conclusion

•ADSL and VDSL are like brothers•high speed-access•Telephone infrastructure•VDSL has not reached a standard yet

•Japan as world Leaders in the telecommunication infrastructure

• Depending on your budget they have a place in residential and/or businesses sector.