Noob question; client is wanting to replace old Adtran switches that currently have a SFP 2.5G link over OM1 fiber. The runs are too long to support 10G and they don't want to replace the fiber. How do I get a Meraki switch solution to support the same 2.5G link over fiber? Specifically what SFP & config would allow that? Thanks all.
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I'm sorry but the options are 1G, 10G, 40G, 100G.
I have never heard of 2.5 G SFP fiber.
You can have 2.5G and 5G copper links but not fiber.
Best to check with your Meraki rep to confirm 100% but I've only ever seen 2.5gbs on rj45 switchports. Fiber has always been 1/10/40/100gbps.
The ms355 documentation seen to support this as well.
Additionally there's no 2.5gbps SFP's supported.
@Red-Five I must admit that I'd never heard of 2.5Gbps fibre links, but it does look like they exist as per your comment, see the link for a transceiver here: https://www.optcore.net/product/2-5g-multi-mode-850nm-300m-sr-sfp-optical-transceiver-module/
In terms of what devices you can plug this into, I'm really not sure! You could try an SFP+ port and see what happens... Though I think it is for fibre channel or SDH.
Thanks everyone for the info and suggestions - great community here.
Not 100% this was an Adtran only feature, but I do believe this was something vendors were doing years ago when fiber links were young; perhaps as a cost saving option. Best I can see the industry has settled on the existing tiers of 1G, 10G, 40G, and 100G and I can't find any current vendors selling this. So, for me, it's a question to the client regarding upgrading their physical fiber to support 10G and moving forward. Since I have the 2.5 SFPs I might try them in my new switch, just to see what happens, but I'm not expecting them to function.
Usually SFP's adhere to standards like 1000BASE-SX or 10GBASE-LR or special types like BiDi, BX, ER, ZR which describes several requirements like wavelength, type of led/VCEL/laser used to transmit signals and more. All SFP's of the vendors then comply with these standards so a switch from vendor A will successfully make a connection to another switch/router/server's SFP module.
Usually in ethernet standards you have ports running a single speed like 1 Gbps and only support SFP modules. But you also have dual speed ports like 1/10Gbps SFP+ ports. And even beyond 40/100Gbps ports.
If your customer has an old fiber plant you'll need to stick to 1 Gbps links but you could bundle 2 or 4 or 8 links to upgrade your inter switch bandwidth that way.