Business Services Industry
AT&T eases access to public data networks.
Business Communications Review, March, 1992 by Berlin, Robert A.
Dial-up access to a public data network (PDN) has always had one aspect that is mildly annoying, if not unbearably frustrating, to users who are at all mobile: Where you call from determines the particular phone number you have to dial to get into the network.
In order to provide ubiquitous, local toll-free dial numbers to users, PDNs have constructed literally hundred of "access" points, and they publish small, thick access directories that, depending on the network, contain the 300 to 800 different phone numbers required to cover the whole country. There is an additional layer of complexity because access lines are typically grouped by the speed of the answering modem. Thus, these directories often contain over 1,000 different access phone numbers....
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