re: http://www.garlic.com/~lynn/2009g.html#66 Mainframe articles http://www.garlic.com/~lynn/2009g.html#67 Mainframe articles http://www.garlic.com/~lynn/2009g.html#68 IT Infrastructure Slideshow: The IBM Mainframe: 50 Years of Big Iron Innovation http://www.garlic.com/~lynn/2009g.html#70 Mainframe articles http://www.garlic.com/~lynn/2009g.html#71 Mainframe articles
for totally unrelated 3081k topic drift .... I was also doing HSDT (high-speed data transport) project and connecting it to the internal network running high-speed links (full duplex T1 and faster). The internal network was larger than the arpanet/internet from just about the beginning until possibly late '85 or early '86. The internal network also required all links leaving physical corporate property to be encrypted. Somebody commented in '85 time-frame that the internal network had over half of all link encryptors in the world. This was not bad for 56kbit links ... but it started to become much more of problem when running at (full-duplex) T1 (1.5mbits/sec in each direction) and higher speeds. old email mentioning internal network approaching 2000 nodes and needing a whole lot of (DES) link encryptors http://www.garlic.com/~lynn/2006t.html#email850625 in this post http://www.garlic.com/~lynn/2006t.html#50 old email complaing that (370) software DES was taking about 1 sec. of 3081K processor time per 150kbytes ... which would require full, dedicated 3081K to handle sustained full-duplex T1 http://www.garlic.com/~lynn/2006n.html#email841115 in this post http://www.garlic.com/~lynn/2006n.html#36 for other drift, one friday (in that time-frame), somebody from the communication group set-out an announcement for a new "networking" discussion conference on the internal network ... which included the following definition: low-speed >9.6kbits medium-speed 19.2kbits high-speed 56kbits very high-speed 1.5mbits that weekend I left on business trip to the other side of the pacific to look at getting some hardware for HSDT project ... and monday morning on a wall of a conference room there was the following: low-speed >20mbits medium-speed 100mbits high-speed 200-300mbits very high-speed >600mbits -- 40+yrs virtualization experience (since Jan68), online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
