On Mon, Apr 24, 2017 at 3:05 AM, Gene Heskett <[email protected]> wrote:
> On Monday 24 April 2017 01:17:33 dave wrote: > > > On 04/23/2017 08:30 PM, Gene Heskett wrote: > > > On Sunday 23 April 2017 23:14:34 dave wrote: > > >> On 04/23/2017 12:44 PM, Chris Albertson wrote: > > >>> Looks like this is a dead end technology. Everyone has gone with > > >>> HDMI. > > >>> > > >>> But really you don't need much to send a differential signal to a > > >>> stepper driver Anything that can invert a 5V logic signal will > > >>> work. The drivers don't want RS422 levels, just logic levels. and > > >>> the receiver is built into the driver > > >>> > > >>> > > >>> But today deferential pairs are outperforming older fiber > > >>> technology by orders of magnitude. toslink is dead easy to use > > >>> but its s at least 30 years old. The best serial cables on the > > >>> consumer mass market are going a few ten's a giga bits per second. > > >>> > > >>> On Sun, Apr 23, 2017 at 10:18 AM, Gene Heskett > > >>> <[email protected]> > > > > > > wrote: > > >>>> On Sunday 23 April 2017 10:03:21 dave wrote: > > >>>>> the foxcon stuff looks a bit pricey. However ... > > >>>>> > > >>>>> http://www.mouser.com/Toshiba/Optoelectronics/Fiber-Optics/Fiber > > >>>>>-O ptic > > >>>>> -Transmitters-Receivers-Transceivers/TOSLINK/_/N-6qrgo?P=1z0zkx4 > > >>>>>Z1 ybqc2 q > > >>>>> > > >>>>> It actually looks affordable including cables. 10 Mb/s but that > > >>>>> should handle anything linuxcnc needs. 10' simplex cables for a > > >>>>> couple of $. > > >>>>> > > >>>>> https://www.monoprice.com/Product?p_id=2669&gclid=Cj0KEQjwofHHBR > > >>>>>DS 0Pnh > > >>>>> pef89ucBEiQASEp6LIW3Tu9rI-YsCuV7XvPZJEDJ4M80OU09A9vYGSpppjMaAjjx > > >>>>>8P 8HAQ > > >>>>> > > >>>>> Dave > > >>>> > > >>>> Only 2 transmitter modules stocked at well over a 10 dollar bill > > >>>> each. No receiver modules are stocked at any price. All hat, no > > >>>> cattle. > > >>>> > > >>>> That is a good enough price on ready-made cables if I wanted to > > >>>> do it with to$link. But the above hardware pricing is not a > > >>>> viable choice when you need lots of them. I have no intention of > > >>>> spending north of $600 for 10 fiber links. > > >>>> > > >>>> Good info Dave, thanks. > > >> > > >> So what you really need ??? is inexpensive Rx and Tx and then > > >> plastic fiber plus an epoxy to bond the > > >> two with low losses into a usable static configuration. Eh? > > >> > > >> Dave > > > > > > You are getting warmer, Dave, although I'd druther use go2 or goop > > > as there's a small chance of getting it apart again should it be > > > needed. > > > > > > Cheers, Gene Heskett > > > > AFIK you want a clear adhesive with a refractive index close to 1.49 > > to match the PMMA core of the fiber. > > > > Dave > > The adhesive, as long as it doesn't touch the core, only the jacket, > shouldn't be optically important. > No, the "goop" absolutely HAS to touch the core file. An "air gap" absolutely will not work. The invention of this special refractive index gell is what made it possible for normal humans to field terminate fiber. Now days the modern connector only has to hold the fiber is alignment then this gell is squeezed in under pressure and fils the air gap. In the old days they used to need to optically polish the fiber ends but now the "goop" is automatically pushed into the fractured end of the fiber by the connector. Here is a video (link below) that shows how a modern connector is used. He does say in the video that the "old kind" is still used but today only in a factory environment. These connectors are not cheap and still require practice. You will water a bunch of them learning how to use them) Better to buy "patch cords" that are pre terminated. OK to TOSLINK is no longer the way to go. Fiber Ethernet is common, try that. This video is good https://youtu.be/SthwoIDprrk Today I'd use fiber only for longer runs of high speed data. Say 10 Gigabit over a few hundred meters as normal cat 5 wire does 1 Gigabit just fine over the distances in a normal office floor. > My dropping the card for enough of everything to make about 20 > connections, is still dependent on finding a source of bare 2mm OD > fiber, getting say 250 meters of it, and the stripping tool if it > exists. > > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > ------------------------------------------------------------ > ------------------ > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
