Hello!
Say, perhaps to change the speed from 1Gb to 100Mbit using the optical 1,25G module? And if using a copper 1Gb SFP-module?
CCR1036-12G-4S , ROS 6.34
You can’t do that. The optical interface for 100Mbps is a different spec than the 1Gbps spec, so the SFP interface cannot change speeds when an optical sfp is inserted.
copper is possible if the SFP supports it - or at least I’ve seen 100Mbps speeds on copper sfp interfaces in Cisco - I haven’t done this with a Mikrotik though.
And this is personally MikroTik “feature” for all boards models or it depends of module model?
I’m planning to use modules MikroTik S-85DLC05D and MikroTik S-RJ01
No - an LH optic is gigabit-only. an SX module is gigabit-only.
On fiber, the standard is 100-base-FX. If you are connecting to a device that is 100-baseFX on the other end, then you need a 100-baseFX optic on your side. They use different wavelengths so you can’t just plug in an LH optic and ask it to slow down to 100Mbits.
There are 100-baseFX sfps for sale on the market, but as usual with sfps, it may or may not work with your equipment (i.e. the Mikrotik might not recognize it). Buy one and roll the dice, put a gigabit optic on the other end, or else get an external media converter to convert the 100-baseFX into copper. Those are your options. It’s not a Mikrotik limitation, except perhaps to say that there might not be any mikrotik-compatible 100-baseFX modules.
Thanks! About optic i unerstood, what about MikroTik S-RJ01? Can it work on 100Mbit? In description says “S-RJ01 is RJ45 SFP 10/100/1000M copper module” http://routerboard.com/S-RJ01 but in technical specification table data rate is 1.25Gbps
In my experience, copper SFPs are able to be set to lower speeds, so I would expect that this one could do the same.
I’ve never used a copper sfp module in a Mikrotik, so perhaps someone else who’s used one can confirm that it does/doesn’t work.
Checked MikroTik S-RJ01 module at work. It works well in all modes - 10/100 (Full/Half duplex) and 1Gb. MDI/MDIX also works fine.