Michel, Ca devrait pas être permis de balancer un truc pareil un vendredi soir :)
Le 19 janv. 2018 à 18:34, Michel Py a écrit : > Les détails du machin avec les jarretières de conditionnement de mode > assemblées à l'envers. > > Depuis, fs.com a corrigé le problème. J'ai pas d'actions chez eux et ils sont > pas parfaits, mais au moins quand tu leur écrit ils s'en occupent. > > > > Michel. > > > Hi Alice, > > I completely agree with the schematic you sent earlier, this is how things > should be done indeed. > > I suggest you grab randomly some out of your own stock for visual inspection. > ALL the mode conditioning cables we just reveiced were reversed, we ordered > some LC to ST and SC to LC in various lenghts. > > I am having a very low yield on these mode conditioning patch cables so far. > Too early to draw conclusions as I am dealing with a old MM cable plant, but > I had three links to bring up last night and I can get only one to connect. > All of our 10G optics are Cisco branded and we have plenty of spares. > > I would like to see some production data on what you do for core offset at > the SM / MM splice. Please note that we mostly use 10GBASE-LX4, which are > CWDM transceivers, and the core offset and fiber alignement are critical. > > Here are some pics for you. I also attached them in case they don't display > correctly inside the HTML message. > > pic1.jpg : LC to ST mode conditioning cable we just received. > The transmit and receive are reversed. Also note that the A and B sides are > the opposite of what the gray clip says (barely visible) > [cid:[email protected]] > > > > pic2.jpg : SC to ST mode conditioning cable we just received. > The transmit and receive are reversed. Also note that the A and B sides are > the opposite of what the gray clip says; visible better than on the LC one. > [cid:[email protected]] > > > > pic3.jpg : how it should be done. These are Cisco 10G Xenpaks, note that the > TX side and the RX side are clearly labelled on both the switch and the optic. > These are your cables, AFTER I disassembled the grey clip and REVERSED the > equipment side. > [cid:[email protected]] > > > > pic4.jpg : a view of the lower part. Note that it does not matter the type > of optics used : here we have a 10GBASE-LX4 optic and a 10GBASE-SR optic, the > TX and the RX are always on the same side. > [cid:[email protected]] > > > > pc5.jpg : without flash. The 10GBASE-SR TX side is visible because it's a > 850nm light (looks red to the eye). > The 10GBASE-LX4 TX side is not visible because it is a 1310nm light. > The 10GBASE-SR does not use mode conditioning patch cables, this pic is jut > to demonstrate further on which side the TX is. > [cid:[email protected]] > > > > pic6.jpg : > There are 1GBASE-SX GBICs. the TX side is now on the right because Cisco > mounts them upside down, but it is the same as above, because the keying tabs > are now on the bottom. > This is probably one of the most common wrong assumptions about which side > the TX is, because Cisco mounts half of them upside down. What counts is the > side relative to the keying tabs. There is no left or right. > [cid:[email protected]] > > > pic7.jpg : general view of a switch with SFPs with LC connectors with the > clip on top. > [cid:[email protected]] > > > pic8.jpg : no flash. > As mentioned earlier,on a LC connector, if the clip is on the top, the TX > side is on the left. > [cid:[email protected]] > > Thanks, > > Hi Michel, > > I’m shocked with the situation. We’ll do best to solve it, please be rest > assured of it. > I have double checked with our production department, and they ensure that > the single mode part is connected with the TX, > and the multi mode part is connected with the RX of our mode conditioning > patch cables. > > First of all, would you help to check if you connected the cables in the > right way? > How to Install the Mode Conditioning Cable > If your gigabit LX switch is equipped with SC or LC connectors, please be > sure to connect the yellow leg (Singlemode) of the cable to the transmit side, > and the orange leg (multimode) to the receive side of the equipment. It is > imperative that this configuration be maintained on both ends. > The swap of transmit and receive can only be done at the cable plant side. > [cid:[email protected]] > If you have connected these cables right, could you offer me more information > about the situation? > Such as the transceivers type you connected with? A picture will be better. ^^ > > Your confirmation will be much helpful. > We need to confirm the reason of the situation, thus we could arrange the new > ones with the right cable for you.^^ > Hope you could understand. > > Best Regards, > > Alice, > > FYI, ALL the mode conditioning patch cables arrived backwards. The single > mode part is on the receiving fiber, where it should be on the transmitting > fiber. > > LC connector with the clip on the top : the TX is on the left (yellow fiber > blue jacket). > SC connector with the notches on the top : TX is on the left (yellow fiber > blue jacket). > > All of your cables are backwards. It is rather annoying to have to swap all > of them. > > Michel. > > > > > --------------------------- > Liste de diffusion du FRnOG > http://www.frnog.org/ --------------------------- Liste de diffusion du FRnOG http://www.frnog.org/
