We have Cisco router with XFP-10GLR-OC192SR fiber transceivers and other end we have 10GBASE-SR SFP+ does that work to different capability.

In short one side LR and other side SR fiber port does that work or i should match them?


Inside datacenter (short distance) should we go with SR or LR

  • I think those use different wavelengths. See the table in cisco.com/c/en/us/products/collateral/interfaces-modules/…
    – Ron Maupin
    Jul 14, 2016 at 16:38
  • 1
    SR (short range) works with MMF, and LR (long range) works with SMF, but I think some of the transceivers will work with MMF.
    – Ron Maupin
    Jul 14, 2016 at 16:42
  • I think you are right LR and SR won't work in point to point link
    – Satish
    Jul 14, 2016 at 18:34
  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can provide your own answer and accept it.
    – Ron Maupin
    Aug 6, 2017 at 22:53

2 Answers 2


SR-based transceiver are designed to work over MMF, and LR-based transceivers are designed to work over SMF. SFP+ MMF is incompatible with SFP+ SMF. And if you want them to work, you should use mode conditioning patch cords on each side. But these cables are often more expensive since they are especially manufactured. So, sometimes it's very important to buy right transceiver modules.


What you have isn't right, it may actually link up, but I wouldn't recommend it. For short distance (less than 300m) inside data center over Multimode optical fiber (MMOF) 10GBASE-SR is what you want.

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