[vcf-midatlantic] At&t Dataphone - Modem or "Service"?

jaj at totallyamused.com jaj at totallyamused.com
Tue Aug 6 21:45:10 EDT 2019

It was a Service, appears to still be, though likely no longer actively
sold. It's one of the first digital services tariffed by the telephone
companies (started in 1973.) Started as "Digital Data Service" but was
renamed by AT&T as "Dataphone Digital Service".  Both voice and data
transmission are serviced at speeds from 2.4 to 56Kbps. This was
pre-divestiture, so service and equipment were "one", I recall in the
early 80s having a "modem" that had Dataphone on the front and the Bell
System logo, but it wasn't an analog device -- or didn't work with POTS

>On 8/6/19 4:26 PM, Jeff G via vcf-midatlantic wrote:
>Data-Phone (Dataphone) were a series of product that allowed devices
>(often computers but I don't know it if was limited to computers) to communicate
>across the telephone network. The earlier versions are not the familiar modems
>we had in the BBS error but were built for channelized T1, switched 56 and other
>AT&T services. I don't recall any service with the name Dataphone but I didn't
>do AT&T data services until the late 1980's/1990s. I recall seeing X25 switches
>and various DSUs with Dataphone. In the 80's I also seeing Dataphone on some
>Paradyne modems.

More information about the vcf-midatlantic mailing list