I’m pretty new to fiber, and now I’m struggling to get a connection up and running.
Like subject says, I’m using RB260GS equipped with a pair of MT SFP-modules, named S-3553LC20D. BTW, what’s the difference between these, one yellow and the other blue? ant what is the difference between these and the S-31DLC20D?
Ok, I made a lab setup, splicing fiber pigtails to a few meters of the SM cable I use, using mechanical splicing. Bought a KeyQuick kit for the purpose. After some fiddling with the cleaver and the splices I managed to get a link up and running.
Now moving to the “real world” and the 110meter fiber stretch I am installing between two buildings. I simply cannot get it up and running, despite numerous re-mounts of the splices.
Funny thing is that while the SFP LED of one of the 260’s are lit - and has been throughout the entire troubleshooting session, the other is still dark.
For double-checking I moved it to the other side and patched it directly to the other switch, and it lit up at once.
THe SFP LED of one switch lit and the other dark, how is that possible, as light flows through the same fiber in both directions?
And how can I figure out on which side of the cable the fault is, on the side with the SFP LED lit, or on the other side?
Something I have missed regarding type of SFP modules?
The S-3553LC20D SFP’s are single fiber SFPs for connections over a single singlemode fiber.
One of the SFPs sends at 1550nm wavelength and receives at 1310nm. The other SFP vice versa.
Are you sure that the fibre between the buildings is singlemode?
Sorry for late reply, and thank you for your reply!
Finally got in touch with a guy working for a company in the fiber optic business, and hired them to fusion splice the fiber. According to him mechanical splices are useless for the thin singlemode firbers, what do you think?
Another mistake I had made was that I purchased blue pigtails and green patch cords, the one straight cut and the other with an angle, right?
Fella changed pigtails and then we were up and running
fusion splice is always better but mechanical splices should also work if they are accurately done. you alway have a higher signal loss on mechanical splices, you can test it with an optical power meter. As i think you have spliced only 2 time at you link this should be an issue.
Another mistake I had made was that I purchased blue pigtails and green patch cords, the one straight cut and the other with an angle, right?
Fella changed pigtails and then we were up and running >
don’t mix MM with SM fibers. color
so far i just make up the plugs directly to the fiber myself instead of using pigtails and splice them. but it’s time consuming you have to glue it , hard it (oven or just wait a day ) and grind it.
