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. -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies