Bob Bridges wrote on 11/8/2023 7:00 AM:
Let's see, how many nanoseconds is that again?
The answer to that is as relevant today as it was 50 years ago with Bus and Tag cables: The speed of light is very close to 1 foot per nanosecond. So making computer chips smaller and smaller inherently increases the speed. How much delay is that for a channel extender (whatever the tech is today) for your remote copy dasd that's many miles away across town?
/Leonard
-----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Allan Staller In those days, the limit on bus/tag cables was 200 ft (cumulative). IIRC, that particular block multiplexer was running about 190 ft. De-installing the 2503 saved about 125 ft.
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