Hi,
I’m not experienced with SFP+ transceiver modules. I have a RB5009UG+S+IN and want to make use of the SFP+ slot. 2.5G would be sufficient actually, but I could only find the S+RJ10 from MikroTik. On the product page, it says: Any MikroTik device with active cooling that has SFP+ ports - does that mean I cannot or should not use the transceiver module in the RB5009UG+S+IN because it gets too hot and the RB5009UG+S+IN has only passive cooling, causing stability issues?
Thanks!
Shouldn’t. Although I heard at 2.5G it doesn’t get melting hot like at 10G.
Theres one from FS.com that use less power and technically doesn’t get as hot.
FS.Com also have 2.5G ones, where max ethernet speed is 2.5G and backend runs at 2.5G.
They should run cooler and are somewhat cheaper.
Additional thing to take into account
S+RJ10 can not be controlled which speed it uses.
It adapts to what’s on the other side.
So if there is something advertising 10gbps on the other end, it will also use 10 gbps.
And then it gets hot…
Great thanks for all the info. At FS I found these two:
Generic Compatible 2.5GBASE-T SFP Copper 100m RJ-45 Transceiver Module (LOS)
Max. Power Consumption 2W
Generic Compatible 2.5GBASE-T SFP Copper 100m RJ-45 Industrial Transceiver Module (LOS)
Max. Power Consumption 1.5W
Funny thing the first item (non-industrial) is explicitly marked as “HOT”. The industrial one is probably cooler (hope it’s okay to include the links to FS in the post).
By that they mean they are hot sellers 
In the brochure for the S+RJ10 max consumption is said to be 2.4W.
Hence the fs ones will be very roughly, in first approximation:
1-2/2.4=17%
and
1-1.5/2.4=37%
cooler
so the difference between the two models is noticeable, and - assuming that all the other differences (if any) between them are not relevant - the 12 € or so difference is IMHO a very good investment, as keeping electronics “cool” is always good practice for reliability and durability.
The breakdown of power consumption values in relation to heat development makes perfect sense. I’ll invest the additional €12 then. I’m still a bit surprised though, I thought 2.5 GbE might be significantly cooler than 10 GbE, like less than half or so.
The rb5009 actually has a trick up its sleeve with its thermal design. The SFP cage is coupled to the backplane/heatsink with a thermal spongy thingy. This gives it quite good characteristics for cooling the modules. Still, multi-gig modules run hot, so don’t expect the full temperature range for your device.
I only know by hearsay, but multiple sources indicate that the FS modules run significantly cooler and more reliably.
If you only need 2.5G, I would really suggest using 2.5G modules specifically. This is because many multi-gig modules “speak” 2.5G on the copper side, but then do 10G on the serdes side, which leads to buffer overflows in the module itself. This can lead to some nasty surprises.
Based on Mikrotik docs it should work fine: compatibility page. In my RB5009UG+S+ it’s running on 86 C stable on 10 Gbps (for 1-2 days, I come back in couple of weeks, I have /v2).
Temperature is in the eyes of the beholder (through a thermal cam), I would describe "stable 86 C" as "scorchingly hot" and look for a way to further cool the device.