Klein Tools VDV226-110 Ratcheting Modular Data Cable Crimper / Wire Stripper / Wire Cutter for RJ11/RJ12 Standard, RJ45 Pass-Thru Connectors

Give it a go with these (they don't cost much) and see if things improve: https://www.amazon.com/dp/B073YFM7T4 https://www.amazon.com/dp/B076MGPQZQ and a nice case for the two tools: https://www.amazon.com/dp/B07QQRW41Y

Get this from Klein and these style connectors. You just need to remove the outer jacket, un-strand the wires, and feed them through the connector in the correct order, then crimp and snip the excess off. I used to do it by straightening all the wires and smoothing them out and carefully making sure they lined up, then cutting them to about a half inch, then feeding them into the traditional connector and crimping and crossing my fingers it all worked when I tested it with the test tool. 90% of the time it did, the other 10% I had to yell fuck, and cut the end off and try again. Each time the cable got shorter and shorter so I always made them too longer to have a bunch of slack in case I fucked up.

100mbps isn't a symptom of improperly-grounded shielding. You have an open conductor or short between two conductors, probably on the blue or brown (using 568B sequencing) pairs, most likely on pin 8 (solid brown). From your description, it sounds like you bought a 150ft patch cable and cut in half then re-terminated. What AWG wiring was used in the patch cable? If it was smaller than 23AWG, the conductors might not be wide enough for the connector contacts to reliable pierce into the conductor. Note that larger AWG numbers result in thinner diameter conductors. It's also possible that a mismatch between the crimp die and connector could result in poor crimps. I currently use the Ideal FT45 crimper (as part of this kit) and also own the Klein VDV226-110, which are both great, (but don't do a lot of shielded cable runs). A network cable tester such as the Noyafa NF-8209S or Klein Scout Pro 3 would help you identify the problem. Both have TDR function that can show the distance to the fault (though Noyafa's is easier to use). Noyafa adds a crimp QC test to show if all the pins on a connector are making contact with the conductors.

As others have said, those blue cables are more than likely CAT5 capable of handling Ethernet. You would want to buy a few things to be able to use them as Ethernet RJ 45 Plugs (Pass Through): RJ45 PlugsCrimping Tool: CrimperWire Strippers: Wire StrippersCable Tester: Cable TesterNetwork Switch: Network Switch You would strip the blue wires back enough to crimp the RJ45 connectors on to them, and then use the cable tester to ensure that all 8 wires crimped correctly and find out where the run goes (which wall jack in the home) Then use the switch to plug all the cables into and you have a network with Ethernet now. The switch I linked is probably overkill because its really meant for an Omada system, but it works well for powering devices over Power Over Ethernet like Wireless Access Points or IP Cameras... I did this at my first condo in 2018. Took me a few days to get the crimps right and figure out where all the lines went, but once I did that oh man it was so nice having wired Ethernet. I did this again in my single family home when I ran the cables myself, that took longer but the result is so worth it.

This is what I use for up to 10 GbE at the house: Cat6: https://www.amazon.com/dp/B015QJ4276 RJ45 ends: https://www.amazon.com/dp/B07PXMN2VK Crimper: https://www.amazon.com/dp/B076MGPQZQ Tester: https://www.amazon.com/dp/B0925826M2 Some might balk at the Cat6 (vs 6A) but it's solid copper and I haven't had any problems with it. Rated for up to 55 meters at 10 GbE. Most of my usage is 2.5 GbE or 1 GbE. I generally use single-mode-fiber for 10+ GbE except where I can't (ONT, PoE cameras, APs, etc.).