I have incoming internet from my ISP in a SM 10/125 fiber with SC contacts. In my building there is SM 9/125 cabling with LC contacts.

Can I use an SC to LC adapter directly or do I need to pass a switch (or other SFP media converter) first to translate between the core diameters?

1 Answer 1


10 μm is fairly unusual. However, you should be able to connect them directly using a SMF patch cable. LC vs SC isn't a problem, but the core difference might be.

The key is your link power budget. While it doesn't hurt to go from 9 μm to 10 μm (with 1500 nm), the opposite direction will suffer some attenuation (from reducing the cross section). I'd expect log(92/102)*10 = -0.9 dB.

If that's within the power budget, everything will be all right. With OS2 grade fiber, the attenuation is .4 dB/km, so the adaption costs you ~2 km reach. If the power budget is exceeded, you'll need a 10 μm patch cable and link that directly into a transceiver, in a switch or in a media converter.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.