On 22.04.17 21:24, Gene Heskett wrote: > I watched the local cable folks install a fiber link from our studio > output to the cable head end in Enterprise WV, 39 klicks long as the > cable went. This was in about 1998. Had to send the splicer back and > get new knives or something in it, but when it came back, the first cut > & termination they did was good. 0.47 db of loss in that 39 klicks of > fiber. I half expected 15 to 20 db of loss. Blew me away. I probably > failed but tried not to look impressed.
Have to admit that I would have expected at least the same. I'm not sure the tech wasn't referring to the termination loss, though - that would be half a dB for a good termination or splice, if my wet RAM's refresh cycles are holding up. Back in the late 80s, when we were designing 565 Mb/s optical fibre transmission equipment for the Aussie telco, they installed a regenerator every 50 km up the coast. The remote power feed unit was a switchmode constant current generator with 300 Vdc o/c and enough oomph to power about 1000 km of regenerators. We called it the "Death Machine", and I was very happy to concentrate on the telemetry and alarm system instead, with its microprocessors and much more forgiving firmware. Erik ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
