Hi, I am rather new to fiber systems. I have a previously unused fiber link between 2 control rooms that i intend to activate. The link consists of a switch 4tx/fx 1300nm ---> 2' 62.5/125 mm sc/sc patch cable ---> mechanical splice ---> 600' 6 pair 62.5/125 mm sc/sc (cable run) ---> mechanical splice ---> 2' 08/93 sc/st patch cable ---> 1 tx/fx 850nm media converter. My problem is that I cannot get any communication out of the media converter side of the link via plugging in my laptop. Things that I have verified include my ethernet cable, tx to rx on the fo is verified, and the manufacturer verified equipment compatibility. I believe I have a cabling problem with the 08/93 patch. This is single mode cable correct? and i know for a fact that the 62.5/125 is mm. I do not see how the 2 can be compatible. Right now I have eliminated the 6 pair and brought the MC directly to the switch and tried to get connectivity with the 08/93 sc/st cable. This did not work. For obvious reasons I am thinking that the tx and rx require the right mode cable to recieve and transmit the correct optical power signal without attenuation or boost (which the reciever could not handle). I do not have a 62.5/125 mm sc/st patch cable to verify the equipment. The frequency wavelength difference should be compatible with only suffering distance. So basically my question is that I need to know if these 2 mode cables are ever compatible? I am thinking no, but I cannot find any answers from surfing google.

I would recommend that you set the speeds of your ethernet ports. Hard code them to 100-Full. Thanks.

ok so is it acceptable to use a 08\93 singlemode patch cable at the end of a 62.5\125 multimode run?????????

I've never tried it. Most connections are different. For short runs I guess it would be possible. I am sure long runs don't work. The way light works against the fiber is quite different even if the ends are the same. Of course you can't connect multimode to singlemode ever unless a special port of some kind. rais may be reversed in your selection of full dux or half dux. If you have access to a fiber dtr that would help. From you post I can't be sure I understand the situation fully. Try a smaller lan of some kind such as in room test of setup versus the length of the system. I read it wrong and answer it wrong too. So get off my case you goober.