From mboxrd@z Thu Jan 1 00:00:00 1970 From: schily@schily.net (Joerg Schilling) Date: Tue, 17 Jan 2017 15:21:54 +0100 Subject: [TUHS] TUHS Digest, Vol 14, Issue 63 In-Reply-To: <201701161600.v0GG00XA080461@tahoe.cs.Dartmouth.EDU> References: <201701161600.v0GG00XA080461@tahoe.cs.Dartmouth.EDU> Message-ID: <587e2882.ucdKFsgP38LOZ3N7%schily@schily.net> Doug McIlroy wrote: > The highest levels of AT&T were happy to carry digital data, but > did not see digital as significant business. Even though digital T1 > was the backbone of long-distance transmission, it was IBM, not > AT&T, that offered direct digital interfaces to T1 in the 60s. Was T1 a "digital" line interface, or was this rather a 24x3.1 kHz channel? How was the 64 ??? Kbit/s interface to the first IMPs implemented? Wasn't it AT&T that provided the lines for the first IMPs? I was always wondering how they could provide such a "high speed" line in the 1960s. I hope somebody knows this.... Jörg -- EMail:joerg at schily.net (home) Jörg Schilling D-13353 Berlin joerg.schilling at fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/ URL: http://cdrecord.org/private/ http://sourceforge.net/projects/schilytools/files/