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2.5g capable SFP+ switch or media converters
(lemmy.world)
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this post was submitted on 28 Aug 2023
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10G SFP+ devices should be able to negotiate down to 2.5G. It’s 10G SFP devices that aren’t able to negotiate lower speeds, as 10G actually came a generation before 2.5 & 5G. I think it was something like it was realised that it was overkill in many cases.
SFP+ is 10Gb/s not SFP. The ASIC needs to be capable of the speeds for the transceiver to work. SFP+ is the name given for 10Gb/s module and transceivers.
So if a device supports SFP+ it supports 10Gb/s. It doesn't automatically mean it will work with 5 or 2.5Gb/s transceivers.
See: Ubiquiti devices. No 2.5/5 to be found if I'm not mistaken.
Their enterprise line has switches with 2.5Gb ports. They’re particularly popular among the rack-porn crowd as they have all their ports in a single line instead so they can have just one patch panel and all the ports line up nicely. It only does POE+, not ++, which would be nice for running a POE switch in the garage that could drive both an access point and some cameras.
They also sell SFP+ modules that do 10/5/2.5 Gb
Well now I never looked at those. Good to know.
The whole point of 2.5 and 5 is to support higher speeds over existing lower-rated cabling so I don’t see the point of multigig fiber connections when 10g fiber runs on the same cables that 1g fiber does
They make make it but it seems silly.