A few things to note.
- Wallports with punchdowns are generally only suitable for solid core cable. Plugs may be suitable for solid, stranded or both. Check the datasheets carefully before buying any plugs (and if the datasheet doesn't say go with a different brand.
- Criming plugs is a fiddly PITA, punchdowns are much easier.
- Generally running cable is much easier if it doesn't have plugs on the end.
Generally in most installation work you are using bulk solid core cable off a spool. So punchdowns are the way to go.
OTOH female-female couplers are the way to go if for whatever reason you want to have stranded cables on both sides.
In my personal experience "interference from power lines" is more of a marketing myth than reality with twisted pair cable, which is actually highly resistant to interference pickup, by design.
But fiber its the right choice 10 times out of 10.
Main advantage (practical) - complete electrical isolation - no lovely lighting-induced surges on the data lines frying equipment. Having had those, I strongly prefer fiber for ANY outside line, no matter how short. It's also immune to probably mythical powerline interference, if that makes you happy.
Single mode fiber offers you the highest possible bandwidth now and in the future, and is relatively inexpensive. If you can get "RBR" (reduced bend radius) fiber for an upcharge that you'd consider small, I recommend that, too. Otherwise, just be careful about bend radius when installing the fiber. The "Wisdom" of multimode fiber for short links is based on cost arguments that are no longer true, in my experience, and it will become obsolete where the single-mode won't.
The cost of multimode fiber suitable for high bandwidth so greatly exceeds the cost of singlemode equipment at the ends of the fiber that it makes no sense. If you shop used equipment, the prices get even better. (I have a campus covered with mostly short links of SM fiber circa 2010, because I did the math on this and also read the writing on the wall. If you had installed SM and MM fibers in 1980, your SM fiber would still be good, and your MM fiber would have been obsoleted 3-4 times already.)
Best Answer
Ron hit the nail on the head for the most likely cause. As long as the router has a gig interface and the computer or switch connected to it is capable of gig speeds, then it's most likely a cabling issue. I had this same issue when I did some home wiring a few months ago, turned out 7 of the 8 wires were connected, not 8/8 = not 1000BaseT.