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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Info on MAE-EAST
At 7:00 -0800 1/16/97, Howard C. Berkowitz wrote: >I can't claim to have recent numbers that suggest otherwise, but, some >historical information might at least be interesting. In the early 80s, I >did a good deal of X.25 capacity planning. At what was then GTE Telenet, >we found that up to 50% of our traffic stayed local in large cities. The >larger the city, the more that seemed to stay local...this was especially >obvious in New York, where a great deal of financial data flowed. remember that in the early 80's you basically couldn't lease a T1 from AT&T (I think it was 82 or so when they were first tariffed?) (watch out for that DC voltage...ouch! :-). also DDS services were scarce, etc. So (expensive) low speed analog was the option for leased lines - and private networks were rare. Since then of course the fallout from Judge Greene has changed some things, and it is cheap and easy to put up a DS0 across town - the cost justification vs. per packet charges is a lot different. >Now, these old statistics reflect mainframe-centric traffic, and more >private-to-private than arbitrary public access. The latter is much more >characteristic of Internet traffic. > >SNA and X.25 tended to emphasize the ability to fine tune access to a >limited number of well-known resources, with relatively well-understood >traffic patterns. The Internet, however, has emphasized arbitrary and >flexible connectivity, possibly to the detriment of performance tuning and >reliability. well the strategies for performance tuning are certainly different. [stuff cut] > >Web cacheing would seem to encourage traffic to stay local. ahhh....yup. dave - - - - - - - - - - - - - - - - -
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