Bob, Don't build an ADSL network, build a HDSL network, i.e. symmetric, not assymetric. Interactive gaming, video confereing all are symmetric. Interactive gaming (people to people interaction in virtual worlds) will be the killer entertainment application that drives many people to use the Internet. Then there is video conferencing, telephone over IP, CD quality audio. Not to mention new services that use X-Windows of similar technolgoy to allow people to rent software/computers via the net. Of course, nightly offsite backups of data could also consume large amounts of bandwidth. I doubt that historical data is that usefull. It will show exponential growth, i.e. a doubling every few time units. Traffic per user jumps when new applications are introduced! People who are logging on to read email consume almost no bandwidth, people who are browsing the web consume bandwidth in spurts. People who are playing Quake or are making an IP pohne call consume about 2Kb/sec continuously. People who are backing up their 5GB ($500) harddrive overnight will consume the equivalent of 1/2 T1. In other words, nobody knows what aplications are coming down the road, so build as much capacity as you can afford. As a lower limit, assume that at least 10% of your subscribers will saturate a full full-duplex link at any time by using video conferencing. Dirk dirk@power.net On Mon, 28 Apr 1997, Robert Olshansky wrote:

Hi,

K Claffy at LANR suggested I contactb you.

At GTE Labs we are working on design of IP backbone facilities for ADSL access services. One of the challenges is to be able to project traffic growth per ADSL useer for the next 3-5 years.

Can you direct me to sources of the followinmg:

(1) Measured internet traffic statitics at NAPs for the past two years. (Info available at NAP Web sites that I have found is only for the last 5-30 days.)

(2) Some measurements of growth of traffic/user over the past two years. So, for a fixed or known user population ( eg a Univ campus or an ISP's modem pool) how has traffic per user grown?

(3) Anything else that would be useful.

So I would greatly appreciate it if you could direct me to some source.

TX

Bob

*************************** Bob Olshansky Manager, Advanced Service Platforms Service Research Laboratory

GTE Laboratories Inc. 40 Sylvan Road Waltham, MA 02254

Tel 617-466-2565 Fax 617-466-2650

****************************