Just the title…
Will the S-31DLC20D optics operate at 100 mbps or are they gigabit only? What about the S+31DLC10D? Does old version vs new version make a difference?
Have the same question about the RBFTC11..
The RBFTC11 uses the QCA8334-AL3C switch chip which is 10/100/1000 but that doesn’t mean that Mikrotik’s firmware will allow it.. It is a ‘managed’ switch with all of its features hidden so no idea how it is configured to operate.
Hi,
What 100Mb FO device do you want to connect it directly to?
RBFTC11 transmits with 1Gb over FO but Ethernet side could negotiate speeds lower than 1Gb.
What do you mean when you say “FO”?
Both sides are Ethernet…?
FO = FiberOptic. SFP modules are connected with FO cable and "talk to each other" over FO with 1Gb speed. 1,25Mb actually if all raw transmission data is counted in. That is why there is 1,25 written on them.
"Both sides"? if you mean that RBFTC11 on both sides, then yes.
RBFTC11 is a converter that as one interface uses FO with fixed transmission speed but the other Ethernet interface is able to use 1000/100/10Mb speeds so if you install RBFTC11 on both sides of the FO line then you get ability to connect any combination of 10/100/1000Mb devices on both sides.
That is the information I was looking for. I couldn’t find it stated anywhere that it will only work at 1gbps.
Do you have a source?
https://mikrotik.com/product/RBFTC11
Ethernet
- 10/100/1000 Ethernet ports: 1
Expansion slots and ports
- One 10/100/1000 Ethernet ports, supporting automatic cross/straight cable correction (Auto MDI/X). Either straight or crossover cable can be used for connecting to other network devices.
- One 1G SFP port.
Yes, it that doesn’t say it won’t operate at 100 mbps.
That really doesn’t matter. Most likely a switch port.
It matters if we talk about FO ports and you want to mix 10BASE-X, 100BASE-X and 1000BASE-X modules.
If we talk about Ethernet then it's hard to find an Ethernet copper device that does not support 100 speed. 10Mb could be a challenge.
“FO” ports and twisted-pair (RJ45) are both Ethernet.
Incoming fibre line is going to be 100mbps. I am trying to figure out if S-31DLC20D and the RBFTC11 are going to be work with it. This would be nice for future upgrades, not needing to make any hardware changes. I can grab a 100mbps optic easily enough if the S-31DLC20D isn’t going to link.
The switch chip in the RBFTC11 can operate all four ports at 10/100/1000 but Mikrotik could have hard-coded it to 1000 only in the firmware. It is a managed switch chip.
No. They are just types of interfaces that are used to connect devices communicating with so called "Ethernet" standard that is covered with IEEE 802.something_here standards through 40+ years.
There is no promise that each standard is compatibile with another. Do you expect 10Base5 (so called ThickEthernet) connector equipped devices to be available as they are the original "Ethernet"? Could you find terminators, t-connector and baloons producers? Some standards are still valid but they got unused.
P.S.
I still have 10Mb hub on my shelf ready, just "in case"
802.3 for wired Ethernet.
Yes they are compatible. That is how and why media converters work. Converts Ethernet from one type of physical cable to another.
For the RBFTC11, both ports are Ethernet.
I should have at least one kicking around. Have a few 10/100 hubs too. Still good for WireShark.
Do I expect them to be available? No, but I do expect them to work with any other Ethernet device as they always have and still do.
Think, that it's unfounded claim or at least overextended claim.
There is so many 10BASE, 100BASE, 1000BASE options for wired connections. Modulation, connectors, medium, fixed/negotiaded speeds. No way to say that they all are compatible.
Even the base CSMA/CD protocol has almost no sense when we talk about twisted pair point-to-point/socket-to-socket connections as there is almost no need to detect collision as there are RX/TX separated lines. FO with different waves lengths has no collision too.
Ethernet is a bag-like word that nowadays covers so many different technologies that it's hard to distinguish them by an average user. Even professionals mix that standards.
This is why media-converters and multi-speed switches are able to work, because they are compatible, just a different medium.
If you want a token-ring network to communicate with an Ethernet network, that takes some engineering, not a little adapter.
Some SFPs will operate at multiple speeds, I’m trying to find out if the S-31DLC20D and/or S+31DLC10D will operate at 100mbps and if the RBFTC11 will accept the SFP slot running at 100mbps. Do I need to go shopping for a different SFP module, media-converter, both?
Published documentation doesn’t say they can, but doesn’t say they can’t either.
That is why I asked: what 100Mb FO device would be connected on the other side?
Is it worth do look for special 100Mb FO SFP compatibile module if you can install on the 100Mb side the 100/1000 media converter and connect it to standard 1Gb SFP module?
Most SFP modules have fixed speed set.
I answered.. Most likely a switch. Could be a router.
Huh??
100mbps SFP modules are not special. Older and less common these days but not special.
What?? What 100/1000 media converter?
Correct, and many don’t.
S+31DLC10D I know works at 1gbps and 10gbps (which is not stated in any of the published documentation). XS+31LC10D works at 1, 10, and 25gbps.
I do not ask if it is a router, switch or any other device. Asking: what type of FO module you want to connect to?
I do not say that they are unaccesible.
Isn't it easier to just install converter copper Eth 100Mb <-> 1Gb FO on a side where you have such device and connect it to the typical 1Gb port on another one? Is it a bad idea?
I suggest buying one module and test it by yourself. It would answer all questions. In any awkward combinations.
The optic on the other end? No idea what they will be using.
But it wouldn't. If it doesn’t work is it because the RBFTC11 unit won’t work at 100mbps or because the S-31DLC20D/S+31DLC10D product won’t link at 100mbps.
Really? What a suprise. Are you sure that the other side is compatibile with FO dedicated for 20km range?
Why it should? it's a 1Gb device. Read this: https://www.fs.com/eu-en/blog/is-sfp-compatible-with-sfp-can-10g-sfp-run-at-1g-sfp-gigabit-switch-port-866.html
It would work on the RJ45 and maybe on FO side with 100BASE-FX SFP module. MT does not offer ones.