5.0 out of 5 stars Works perfectly with T-Mobile Home 5G Internet Router

2026-01-22    -kubrickollector

I bought this so that I could power my T-Mobile 5G Home Internet Router (G4AR / G4SE) which I have placed in my attic, far from any 120v outlet. I have it connected via a 35ft Ethernet run to my equipment rack with a Ubiquiti Unifi US-8-150W PoE+ Switch. Note that despite not being PoE++, the adapter is able to pull enough power from my PoE+ switch to operate the router and a usb-c fan I have plugged into the router itself.It is fairly pricey, but that is likely due to it being in-spec with both PoE++ AND USB-C PD. Other, cheaper adapters may only supply limited voltages like 5v, and may not even be regulated. At best those cheap adapters won't power your device, at worst they will damage it. In my case, the G4AR requires 15V over USB-C which this adapter easily provides.Highly recommended.

5.0 out of 5 stars Working great so far!

2026-02-11    -Jason A. Lari

I am trying to get as many devices to run off the POE switch as I can, that way I only need to have the POE switch and my main server plugged into the UPS so when the power goes out, they all remain on from that single switch powering them. I had a hard time finding a splitter that could provide enough power to my 5G modem which requires 15v at 3.0A. This adapter seemed like the only splitter out there that can do both the 15v and the required amps, unlike many other adapters I've tried. I took a chance and was pleased to see it worked perfectly. So now I've managed to get my other 2.5gbe network switch, my router (both using different adapters) and now my 5G modem.The only thing left I would like to power with it is a micro PC I use for media playback and watching my blu-ray rips that are shared on my file server. That PC needs 19V at 3.42A and sadly this adapter just does not provide enough power to do it which I figured would be the case. The computer would power on, but within seconds it shuts off. It's the closest I've gotten for it so far. At least its working great for my 5G modem which also requires a bit of power to run, but its handling it.I am looking to upgrade to a better POE switch that can put out more power per port. I suspect that may be another bottleneck of mine. Hopefully I can find some other option for the PC, but its not critical really, the modem was more important, and I'm glad to see its working great!

5.0 out of 5 stars Powers T-Mobile G4AR as well as Sagecom 5688W just fine.

2026-01-08    -James D. Hardwick

Can confirm that this powers both the Sagecom 5688W cellular modem as well as the newer and slightly more power hungry T-Mobile G5AR without issue. If you experience problems, it's more than likely either your cabling or your PoE switch/gear. In the case of the G5AR, the modem appears to only use around 9-10 watts with idle/light usage, and 12-13 watts doing a speed test.I did experience an issue on startup twice where the modem screen would report an obscure error and suggest restarting the modem. I'm guessing the initial power-on power negotiation might not be perfect. In any case, cycling the power resolved it.Really happy with this. Will allow for much more optimal placement of the modem thus keeping the cable for an external antenna as short as possible!

5.0 out of 5 stars Work for T-Mobile Gateway

2026-01-02    -Andrew Kester

I use this to power a T-Mobile home internet gateway (Sagemcom Fast 5688w) with no issues over PoE. That device only draws 10-15 watts, but requires a PoE++port which is a bit odd, but I'm assuming it's a quirk in the gateway and not this splitter.I mounted to the back of the bookshelf and with a short patch cable and USB-C cable, I'm able to run the gateway with a battery backup with a single cable ran to it.

5.0 out of 5 stars Works perfectly with T-Mobile Home 5G Internet Router

2026-01-26    -kubrickollector

I bought this so that I could power my T-Mobile 5G Home Internet Router (G4AR / G4SE) which I have placed in my attic, far from any 120v outlet. I have it connected via a 35ft Ethernet run to my equipment rack with a Ubiquiti Unifi US-8-150W PoE+ Switch. Note that despite not being PoE++, the adapter is able to pull enough power from my PoE+ switch to operate the router and a usb-c fan I have plugged into the router itself.It is fairly pricey, but that is likely due to it being in-spec with both PoE++ AND USB-C PD. Other, cheaper adapters may only supply limited voltages like 5v, and may not even be regulated. At best those cheap adapters won't power your device, at worst they will damage it. In my case, the G4AR requires 15V over USB-C which this adapter easily provides.Highly recommended.

5.0 out of 5 stars Powers T-Mobile G4AR as well as Sagecom 5688W just fine.

2026-02-18    -James D. Hardwick

Can confirm that this powers both the Sagecom 5688W cellular modem as well as the newer and slightly more power hungry T-Mobile G5AR without issue. If you experience problems, it's more than likely either your cabling or your PoE switch/gear. In the case of the G5AR, the modem appears to only use around 9-10 watts with idle/light usage, and 12-13 watts doing a speed test.I did experience an issue on startup twice where the modem screen would report an obscure error and suggest restarting the modem. I'm guessing the initial power-on power negotiation might not be perfect. In any case, cycling the power resolved it.Really happy with this. Will allow for much more optimal placement of the modem thus keeping the cable for an external antenna as short as possible!

5.0 out of 5 stars Work for T-Mobile Gateway

2026-02-02    -Andrew Kester

I use this to power a T-Mobile home internet gateway (Sagemcom Fast 5688w) with no issues over PoE. That device only draws 10-15 watts, but requires a PoE++port which is a bit odd, but I'm assuming it's a quirk in the gateway and not this splitter.I mounted to the back of the bookshelf and with a short patch cable and USB-C cable, I'm able to run the gateway with a battery backup with a single cable ran to it.

2.0 out of 5 stars Did not work for my TMO-G4SE like others. Item pulsates under a 15v load, works at 12v.

2026-01-14    -Jonathan Hansen

Based on the reviews, I tried to use this with my T-mobile 5G internet modem TMO-G4SE. All it did was pulsate. I measured the stock adapter and it is 15v (14.6) at .6 amps and 8 watts when connected. When I tried with this adapter is just flickers 14.1v or 14.6v and then restarts. I tried a 60 watt PoE++ Ubiquiti injector, and a Trendnet PoE 15.4 injector both with the same results on a 15v load. It did work to charge a USB charger at 12v (11.9) at 10 watts, but failed with the higher voltage required to start the 5G modem. Disappointed, not sure if I will try a replacement or look at another vendor.

2.0 out of 5 stars Did not work for my TMO-G4SE like others. Item pulsates under a 15v load, works at 12v.

2026-01-27    -Jonathan Hansen

Based on the reviews, I tried to use this with my T-mobile 5G internet modem TMO-G4SE. All it did was pulsate. I measured the stock adapter and it is 15v (14.6) at .6 amps and 8 watts when connected. When I tried with this adapter is just flickers 14.1v or 14.6v and then restarts. I tried a 60 watt PoE++ Ubiquiti injector, and a Trendnet PoE 15.4 injector both with the same results on a 15v load. It did work to charge a USB charger at 12v (11.9) at 10 watts, but failed with the higher voltage required to start the 5G modem. Disappointed, not sure if I will try a replacement or look at another vendor.

1.0 out of 5 stars Power Cycling Problem

2025-12-23    -Mr. B

Saw some reviews & online discussions of people recommending this PoE splitter for powering T-Mobile 5G Internet Gateway. I was using w/ UniFi Pro 24 switch with POE++ ports. Tried multiple ports and cables but could not get consistent power. (It just kept cycling on/off). Returned and ordered a replacement but had same problem. Some reviews are good, so maybe its just quality control issue, but since I tried with 2x units, I was pretty discouraged.