2 Pack Fiber Ethernet Media Converter, WTSFOPTC Fiber Optic Transceiver with 2 Pcs 1.25Gbps SFP Transceiver, Gigabit SFP to RJ45 Media Converter with 1000BASE-SX SFP to LC Modular (MMF,850nm,550m,DDM)

I was using a couple of managed Cisco 8-Port Switches running over Single Mode Fiber from my FIOS Router upstairs down to my PC in the Basement. I previously need to use multiple Switchports but had whittled it down to needeng just a single 1-Gig Port to serve my PC. I had to relocate my FIOS Router and Fiber Cable, so I thought that would be a good time to pull out the Two Cisco Switches and replace them with a Fiber Converter (tiny in comparison and using a fraction of the Power the Switches use). I bought Two of these units and couldn't be happier. They apparently use Proprietary SFPs, so they aren't interchangeable with those from Cisco (that would be nice), but otherwise is great product. Connect your Fibers Tx to Rx for each strand and watch it go. LED lights tell you whether the Link Layer is up or not and if Data is flowing. Price is competitive and if your Cable is sollid, it just Works.

We bought this to isolate our local church’s network from the Spectrum internet modem. Twice, within a month, the modem was blown out by lightning and it damaged the router. This is plug and play - no programming - and isolates the equipment. It’s a low cost, sacrificial, way to save the network in the future.

Product was easy to use and install.

I used this SFP media converter in my POE security cameras, but after only 7 days of use, the power supply broke down and the quality was poor. I do not recommend purchasing brand.

These are somewhat "batteries" included since they include the SFP transceivers which was nice. (You'll still need your own LC-LC fiber cable though…) I was able to use them with some alternate inserts I swapped in, as well as across to another brand of media converter so long as the transceivers were matched.Sturdy little cases and nice small power supplies. Seem to stay fairly cool although I haven't been pushing a ton of bandwidth through them.

My test setup:Laptop 1: i5-1235U with USB-C 3.2 Gen 2 (10 Gbps) TB4 capability.Laptop 2: i3-8145U with USB-C 3.0 (aka 3.1 Gen 1) (5 Gbps) PD capability.Control:2.5 Gbps USB-C adapters directly connected through 10ft. Cat6 cable, an RJ45 coupler, and a 3 inch Cat6 jumper (Manual IP assigned, Auto-MDIX, Firewalls disabled). Iperf 3.1.3 results = 2.14 Gbps throughput on multiple tests…i.e. confirmed faster than these.Test:After the direct wire test, I immediately replaced the RJ45 coupler with these converters/modules (and a 3 meter OM3 fiber jumper) and re-ran the speed test: ~950Mbps. These claim 1.25 Gbps so they seem to have a rather large 24% overhead. But to be fair, I’ve had the fortune to test a handful of media converters and SFP modules at this point (Thanks Vine!) and have noted that: 1. The 1.25 Gbps claim on these converters/modules generally and consistently perform close to 950Mbps. 2. I can’t discern performance between the converters and the modules as I haven’t yet acquired/tested a combination that exceeds ~950Mbps. (I'd include iperf3 screenshots, but AMZ always rejects them...even if I mask the paths/IPs.)Also, the SFP modules are hot-pluggable in my Cisco SG350-28-K9 V01 switch (which has two 1Gbps SFP ports).So my opinion is that this is a good converter/module kit…and that 1Gbps is still plenty adequate for most residential, and many commercial (endpoint/access tier) applications…especially if you need an extended (>100m/300ft) or EMI impervious link.

Make sure you get the right optical fiber for this. LC is the kind of connector on the ends. MMF means this is for multi-mode fiber, not single-mode. 550M means the fiber can be up to 1800 feet long. 850nm means the light used is near-infrared, your eye will barely sense it as a slight red glow like from some security cameras at night.The ethernet runs to this device can be about 300 feet long, but I recommend that they should be just a few feet long, otherwise why are you using fiber?If you need more than 1800 feet, you will have to go with more expensive devices that use single-mode fiber, and more expensive fiber. Those use laser diodes to light the fiber, this kind only needs a cheaper LED.If you have equipment that is damaged every time a storm comes by, or from things you can't even see, this isolates the network connection. If you do see that sort of damage regularly, the rest of what you'd have to do is in Ward Silver's book on Grounding and Bonding, 2nd edition, sold on Amazon. It's written for radio hams, but that just means it's easier to understand because not all of them are engineers.There are a few advantages of an optical vs. wire Ethernet run. It's probably less expensive to use multimode fiber than CAT7 or CAT8 wire for long runs. Fiber is not susceptible to lightning as wire is, and thus protects your equipment from damage that comes through the network connection. A lot of lightning-prone areas use it for every long run. I run a ham radio station, and fiber neither emits electrical noise nor is it bothered by interference from my transmitter. And a fiber connection is insensitive to the issue of separated equipment never being at the same ground potential.Each of the two boxes run on an external 5V "wall-wart" power supply.Another reviewer brought up that he bought these to improve his digital audio quality by going from copper to fiber. No, that is not possible. The digital bits are going to be the same digital bits whatever you do. You can't improve their shape or make them anything but the same ones and zeroes. Any real electrical engineer or computer scientist will tell you that, the folks who say otherwise have an interest in selling a product or don't understand the technology. Packet loss is also unlikely for short point-to-point runs in your home, so that's not going to be an issue unless you mis-wired the connection or the wires have been damaged.