Hi, I have a legacy 2-wire phone cable between couple of objects (30 meters long). Which SFP modules could I use and which MikroTik models support those in 2026? Would love to have some 300mbps. Previously I tried TP-link powerline Ethernet over 220V, but those are buggy a/f.
Standard ITU G.hn specifies also transport of ethernet frames over "plain" copper pairs (phone lines). Similarly homePNA does standardize use of phone lines as well. This kind of transport is not very popular, so adapers are quite rare ... but you can try to find some. The powerline variant would in principle do as well, the pronlem is that these adapters draw power (gor thrir own consumption) from same libes as they use for data communication ... and in your case, those phone lines are not energized.
In any case I don't think that plain phone lines will offer you 300Mbps. Technology which does offer fairly high throughputs over phone lines is VDSL and even there (and even using professional gear) speeds are generally up to 100Mbps (and dropping fast with distance). You'll probably have to replace that plain phone line cable with something more modern (preferably fiber optic cable, or shielded UTP6 or UTP7) variant ... if old cable is laid inside some duct or pipe, you can use it to pull the new one in while removing tne old one.
Have you ever found (are you aware) if 2-wire VDSL SFP module exists at all in the wild?
Think that not. Look for 3rd party VDSL convertes like Planet VC-231G
I have tested a VDSL SFP in the past, but it is not supported well in RouterOS (you cannot display the line connection parameters like you can do for other SFP types) and it ran incredibly hot in a passive cooled router. You would at least need a fan-cooled device that provides some airflow.
VDSL2 will provide up to 300Mbps and should achieve that over the target 30m distance, but only in one direction. The other direction will be more like 30Mbps. But maybe that is OK in the original poster's use case...
Am I then better off with standalone devices like lantronix eop or ubiquiti uacc?
Actually i used 2 generations of tp-link g.hn adapters and they sucked ass. First were couple of 100 mbps powerline plc adapters working over 220v. They gradually started to degrade performance and frequently just froze. Then i bought next gen tp-link plc and it went exactly the same, 3 months ok and then restart every 30 min was needed.
I do not see how you could use "ubiquiti uacc" in your case, that seems to be a DAC similar to MikroTik DDQ, which is intended to connect devices with SFP ports within a rack or between racks. That is a fixed cable with a length like 3m (the ubiquiti is 30cm) not a device that allows to use existing phoneline TP.
In the past I used "MoCA" devices with great success, but they use Coax cable instead of TP. They are intended for TV Antenna Coax. When you can replace your cable with Coax it could be an option. These provide reliable connection with speed up to 1Gbps.
Of course they normally will have RJ45 ethernet so when you need to use SFP you also need an adapter for that (another can of worms...). And when you can replace the wire with Coax, the natural thing would be to replace it with Fiber or UTP.
For a mere 150/160 bucks apiece 
...
Anyway the VC-231G is (in ideal conditions) around "180/180Mbps Downstream/Upstream", or - at the most - asymmetric "300/100Mbps".
For the half that kind of money you can have "good" (as in "non-TPLINK") Powerline adapters.
A couple Devolo Magic link 2 should be around 150 Euro and offer (unless there are structural issues in electrical wiring) 4x-8x that speed.
Actually I tend to believe there are structural issues in my wiring. The 2nd attempt of my Powerline saga included adapters which had shown the link speed. When put in the same socket, pair of Powerlines connected at some 800+ mbps. When I established the link between 2 remote rooms, it dropped down to 36/54 Mbps. It was more or less OK but after 3 months it started freezing just like in the previous attempt. So I tend to believe my wiring scheme, voltage oscillations etc have significant impact on powerline as such. Therefore, I don't want to rely on it any longer and will finally put into use the phone wire (single twisted pair).
I think you are talking about a different device. What I am referring to is https://eu.store.ui.com/eu/en/products/uacc-retrofit-poe-2wire
it is exactly what I need - ethernet bridge over single twisted pair.
I am hesitant: either this (but only 85 Mbps) or Planet (300 Mbps).
UACC has an added bonus of being PoE so I don't have to occupy an extra power seat
I was planning on buying something like this, but in the end it wasn't necessary
https://cdn.lantronix.com/wp-content/uploads/pdf/TN-EOT-xx-Overview-1.pdf
https://www.patton.com/ethernet-extender/cl-sfp/
https://comnet.net/products/details/100mb-extended-distance-copperline-sfp
If you up for "hacky" solutions you could probably get a 1000BASE-T1 media converter but they're quite pricey.
They should (but might not) work.
Generally speaking (it has of course to be seen specifically), electric wires are good enough, voltage oscillations are not influent as (hopefully) mains is filtered independently from the voltage level.
BUT there are two things that can make a difference:
- solid core conductor vs. stranded (the first is much better for data), there is nothing you can do about this, short of replacing cables.
- intermediate (between the two powerline devices) electrical boxes or however junctions
- actual terminal/clamps on the two sockets to which the powerlines are connected.
For #2 and #3 tinning the junctions and terminals may better the transmission of data over the line very noticeably.
This said, since you already have a set of powerline adapters that you don't use, they can usually be modified to use a low (DC) voltage (compatible with the telephone line, remember that a normal old school telephone line used to have some 90V for ringing and 48 V on hook loop) or be simply powered externally and send only the data over the line.
It is a relatively simple "hack" if you can use a soldering iron and a multimeter, examples:
http://www.helicopting.de/
https://www.instructables.com/Ethernet-Over-Telephone-Lines-or-Whatever-Cable/
On the other hand, if you are OK with some 250-300 € expense, have a look here:
https://www.gigacopper.net/wp/en/home-networking/
and read:
https://thehftguy.com/2026/01/22/doing-gigabit-ethernet-over-my-british-phone-wires/
These thingies can do around 1Gbit (of course on "good" cables).
No matter what it's just powdering the problem and wishfull thinking.
I would consider replacing the cable.
Old 2-wire could be rusted, damaged by mice or rats, insulation could be shrivelled that means possible shortcut, ....
Negative. Unlike the old wiring, I have installed this phone cable myself some years ago and I absolutely trust it.
Thanks a lot! Lantronix seems most cost-friendly out of those 3 
Wow! This gigacopper stuff looks nice. Thanks for the suggestion!
1Gb is max from ethernet side. It's not said that 1Gb could go over 2 wires.
From manual:
• ITU-T G.993.5 G.vectoring and G.INP
• DMT-based coding technology
• Built-in POST splitter to share voice and date
• CO/CPE mode selectable via DIP switch
• Selectable target band plan and SNR margin
Up to 150/150Mbps bandwidth (in G.INP, Sym, 8dB mode)
• 1 10/100/1000BASE-TX LAN ports.
• Complies with IEEE 802.3, 10BASE-T, IEEE 802.3u,
100BASE-TX and IEEE 802.3x, flow control Ethernet
standards
• Half duplex back pressure and IEEE 802.3x full duplex pause
frame flow control
• One RJ11 connector for VDSL port with VDSL connection
• Voice and data communication can be shared simultaneously
based on the existing telephone wire
• IEEE 802.1Q VLAN tag transparency
• VDSL2 standalone transceiver for simple bridge modem
application
• Advantage of minimum installation time (Simply by Plug-and-
Play)
• Supports extensive LED indicators for network diagnosis
• Co-work with PLANET media converter chassis (MC-700/MC-
1500/ MC-1500R/MC-1500R48)
Is this Lantronix compatible with MikroTik?