Multimode Fibre OM3 to OM2

Hello experts

We have an older OM2 backbone that goes to a patch panel. Plugged into the patch panel is another OM2 cable with an ST connector going from the patch panel to an LC connector that plugs into a SFP transceiver on a switch.

We want to upgrade to a new switch that has 40GB QSFP ports. We have a 40GB MPO to 4 x 10 GB LC splitter cable so we can take one of the ports from 40gbps to 4 x 10gbps. The new switch with this QSFP port only supports the splitter as an OM3 cable (I don't think OM2 runs at 40gbps). Could we plug the 10gbps LC end of the splitter cable into the OM2 backbone?

What happens if you connect an OM3 cable to an OM2 backbone? Are they compatible?

Thanks in advance.

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Garry GlendownConsulting and Network/Security SpecialistCommented:
The OM3 cable has (slightly) better physical specs than OM2. Anyway, with the same core sizes (50/125µm) plugging one in to the other will not cause much of a problem. Remeber, though, the maximum distance of the OM2 cabling you use will not profit from the short OM3 patch. Definitely do not go over the total spec'ed 82m at 10G ... (at 1G, OM2 can get up to 600m)

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Mixing OM3 & OM2 is not officially supported.  You'll have to test it yourself and see if the SPF's on either end are able to detect each other.  It is possible to get different types of fiber to maintain a connection, but it can be buggy and cause dropped packets, retransmisions, etc.
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