James Knott wrote: > Carlos E. R. wrote: > >> The Wednesday 2007-06-13 at 23:49 -0800, John Andersen wrote: >> >> >>> Another roaring success story. Gad what a hopelessly >>> complex and expensive network. The sad part is they >>> "invented" it while the unix world was happily running >>> TCP/IP. >>> >> Token ring was invented in 1960, tcp/ip in the 70's. >> >> > Actually, TCP, not including IP predates token ring by almost a decade. > The oldest computer network technology that I've worked on is the TDM > loops used with the Collins line of computers. These computers were MIL > spec versions of IBM gear and were networked back in the mid '60. The > networks used time slots, instead of packets to share the cable. The > original "TDM" system ran at 2 Mb/s and the later "TDX" loop was 8 > Mb/s. The network was connected in a ring or loop. The network used > relays to connect devices, such as CPU, tape and disk drives, card > readers etc. to the loop. In TDX systems, high speed devices, such as > the CPU, tape and disk drives were connected directly to the TDX loop. > Lower speed devices were connected to the TDM loop, which in turn, > connected to the TDX loop via an interface box. There was also a "loop > sync" box, which maintained loop syncronization. > > Here's a picture of what is in fact the 8401 model of the Collins > system, even though it says 8500C. The "CN" referred to in the picture > is for Canadian National Railways. I started my career working for > their telecommunications division about 35 years ago and work on the > 8500C, though occasionally did minor work on the 8500B, along with many > other mini-computer types. That picture would have been taken in the > office I worked in, but I don't recognize the person in the picture. > > > Hmmm... I forgot the link.
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