I think i got it now with the help of your last post and also of @ArwenWhat part of "and the same wavelength" are you having trouble understanding?
Cool cool. I got it.Yes.
SR 850nm MMF on one end -> SR 850 nm MMF on the other end (each with its own vendor coding; "generic" should be fine on Mikrotik's end)
LR-10km 1310 nm SMF on one end (because SMF is a lot cheaper than MMF for duplex LC) -> LR-10 km 1310 nm SMF
…and you can have both next to each other.
Umm, as far as i'm aware, the LR optics is used for long distances. Can they also be used for short distance? And if using the LR optics, do they generate any kind of noise which needs to be damped?@Etorix don't you need a dampening element if you connect two LR SMF modules over a short distance?
OK, so I did not miss anything. Modules with an output power to drive a kilometre of fibre without any intermediate repeater/amplifier overload the receiving end if connected over a couple of meters.Maybe… I admit I have never used SMF (or LR modules) so far; I made up an example with different protocols and wavelenghts for illustration purpose.
For 10GBase-LR, the minimum run specified is something like 1.5 m. That means most practical installations are fine without attenuators.@Etorix don't you need a dampening element if you connect two LR SMF modules over a short distance?
Same type of optics, yes. There are very weird types once you start digging deeper and once you move to QSFP. For standard SFP/+/28, stick with the basic SR or LR and you should be fine. For QSFP+/28, it will depend on your cabling situation.To recap, the same wavelength means that both the NIC and switch end should have the SR/LR optics right?
QSFP breakout cables are available in basically all types: plain fiber cable with high density connector on one end and duplex LC pairs on the other, Active Optical Cables, and Direct Attach Copper. The Mikrotiks support breakout, but not all devices do. Always double-check.Is this AOC?
Mikrotik doesn't vendor lock. HPE is a massive pain, depending on whether you have legacy HPE stuff or Aruba stuff. Dell is just Dell, so at least it's easier.Umm, I'm not sure about that either. HPE and Dell require their own modules for the link. But as far as I'm aware, Mikrotik doesn't have such special requirements.
Most 25 GbE NICs and switches can do at least 10 Gb/s and 25 Gb/s. However, SFP modules often do not. Unless you have a good reason to do otherwise, use the lowest common denominator SFP module or cable, e.g. 10GbE to connect a 10GbE to a 25GbE device.Will this all work correctly? I'm concerned about the compatibility. Can i use like this (interconnecting 10G and 25G) or both the switch end and NIC end has to be the same module must have the same wavelength and speed?
Yes, the range is less than 50 meters. Definitely going with the SR, MMF.OK, so I did not miss anything. Modules with an output power to drive a kilometre of fibre without any intermediate repeater/amplifier overload the receiving end if connected over a couple of meters.
So @Fastline in general you want short range multimode for local connections.
Hmm. Yes, its very complex. Hopefully, i would be able to get it done easily with your support guys. Thank you everyone so far!Same type of optics, yes. There are very weird types once you start digging deeper and once you move to QSFP. For standard SFP/+/28, stick with the basic SR or LR and you should be fine. For QSFP+/28, it will depend on your cabling situation.
Oh, another learning for me :)QSFP breakout cables are available in basically all types: plain fiber cable with high density connector on one end and duplex LC pairs on the other, Active Optical Cables, and Direct Attach Copper. The Mikrotiks support breakout, but not all devices do. Always double-check.
Yeah, i have heard too many scary story. Afterall, that's another way to make some extra $$$$ buy implementing the vendor lock, forcing customer to buy the vendor compatible module only.Mikrotik doesn't vendor lock. HPE is a massive pain, depending on whether you have legacy HPE stuff or Aruba stuff. Dell is just Dell, so at least it's easier.
Yes, yes. I'll need to draw a diagram soon.Most 25 GbE NICs and switches can do at least 10 Gb/s and 25 Gb/s. However, SFP modules often do not. Unless you have a good reason to do otherwise, use the lowest common denominator SFP module or cable, e.g. 10GbE to connect a 10GbE to a 25GbE device.
The switch or the NIC passes electrical signals to the module; vendor lock may be involved in this communication (i.e. equipment refuses to communicate if the partner does not first show a suitable identity card).BTW, the switches involves vendor locking, do they require the vendor compatible module at the switch end or at the NIC end too?
Gotcha!The switch or the NIC passes electrical signals to the module; vendor lock may be involved in this communication (i.e. equipment refuses to communicate if the partner does not first show a suitable identity card).
The module then converts the electrical signal to optical, at a given wavelength and with a given protocol (SR, LR). Over the fibre, there's no vendor.
The receiveing module takes the optical signal it expects (wavelength, protocol) and converts it to electrical, which it passes to the NIC or switch—possible vendor lock.
I suggest compatible optics from fs.com. Otherwise, used Finsair from eBay can be a good choice, as I've heard.- What do you guys suggest regarding the optic brand? Finsar or Broadcom?
The power output from the modules isn't enough to measurably heat up the fiber.Ad does the Fiber Cable also heats up during the transmission?
Yes, for certain values of "discontinued".Does End of Life here mean the optic module is discontinued?
Look at the type column. One or two speeds (1 Gb/s and 10 Gb/s; 10 Gb/s and 25 Gb/s).2. What does Single Rateand Dual Rate mean here?
Well, a wider range of specified ambient temperatures. This is not a meaningful concern for most people.3. What does Extended Temp mean here? And what are the standard Temp?
Some, of course. How much will depend on the specific module.Do these optic module generate a lot of heat?
Not to any extent measurable outside of a high-end metrology lab.Ad does the Fiber Cable also heats up during the transmission?
As with all electronic devices, the transceivers must operate within a reasonable range of temperatures, yes.I read somewhere that if there is rise in temperature, there can be signal degradation and it can stop working. Is that true?
You're overthinking this. Buy whatever from the list. Used or new. Or buy something explicitly listed as compatible. Or don't and tell the driver to accept non-validated SFP modules.What do you guys suggest regarding the optic brand? Finsar or Broadcom?
Thanks mate.I suggest compatible optics from fs.com. Otherwise, used Finsair from eBay can be a good choice, as I've heard.
The power output from the modules isn't enough to measurably heat up the fiber.
Thank you for answering all my questions. Highly appreciated!Yes, for certain values of "discontinued".
Look at the type column. One or two speeds (1 Gb/s and 10 Gb/s; 10 Gb/s and 25 Gb/s).
Well, a wider range of specified ambient temperatures. This is not a meaningful concern for most people.
Some, of course. How much will depend on the specific module.
Not to any extent measurable outside of a high-end metrology lab.
As with all electronic devices, the transceivers must operate within a reasonable range of temperatures, yes.
You're overthinking this. Buy whatever from the list. Used or new. Or buy something explicitly listed as compatible. Or don't and tell the driver to accept non-validated SFP modules.