I’m not really familiar with ADSL and how it works but I am well versed in RF including DOCSIS (cable).

The balun (stands for balanced to unbalanced) is to change from twisted pair to the 75 ohm coax used by your modem. It seems like an extra step - they should have run a jumper rather than go through the unnecessary conversion to coax.

Question: Is that Pace box a TiVO? Pace manufactured boxes with TiVo software.

Who is your cable provider?

I’ve had gophers and moles chew right armored fiber in HDPE. Rodents will always take the path of most resistance, unlike electricity.

Are you using your ISP’s modem? And if so, is it a gateway (does it also have built-in WiFi?). If so you need to disable the NAT on the router in the ISPs modem. Your ISP may give you access to an account page where you can do this or you may need to call them and have them do this. The ISP I work for calls it “bring your own router” or BYOR. What you are describing sounds like you have an IP conflict.

Depending on your local building codes and whether they adopt the NEC for electrical safety, bonding some types of fiber is not an option, it’s required. For reference, see NEC § 770.100. Notice the use of the words “shall be bonded or grounded”.

The advice being given by some posters is to go with fiber like it is some way to get around bonding/grounding requirements. Thats not entirely true. Depending on the type of fiber, it must be bonded as fiber often has metallic tracer wire and armor that is part of its construction.

Because OP mentioned that it’s an underground run between a barn and a house, I would personally use armored cable. Rodents will eat through conduit and cable. I’ve replaced and repaired miles of feet of cable due to rodents - even armored cable in conduit. Rodents are persistent.

If this is your recommendation, it would help the OP if you specified a good quality non-conductive fiber optic cable. There are conductive fiber optics cables in this world, and it is required that they be bonded. Thats why NEC §770.100 was written.

Personally, because I’ve dealt with a lot of rodent damage in my career, I’d use an armored (conductive) cable for an underground run as rodents will chew through conduit. Armored fiber optics cable is designed for exactly these type of situations, and must be bonded.

You know that depending on the optical cable being used, grounding is still very much required, right? If this were my project and I was running underground cable to a barn, I’d use armored fiber cable to prevent rodent damage. Even if the cable is in conduit. Gophers and moles are the worst. I’ve had them chew through armored and loose tube fiber that was in conduit - which is why I will always go with the harder to destroy stuff.

There is a lot of conductive fiber optics cable, with armored being just one type. Hence the reason NEC § 770.100 requires conductive fiber optics cable be bonded. We know it’s not the fiber that is the problem - it’s the metal that is part of the cable’s construction that will conduct electricity.

Do a speed test on something besides your XBox. The issue can and likely is your XBox.

The high pass was blocking 3-35 MHz. The other is likely a MoCA filter. If you have a MoCA network, you absolutely want that filter in place. It’s a security issue. Your entire network is accessible by anyone nearby that has a MoCA network. Every one of your devices will appear in their network as a wired device and will not require authentication. Set top boxes may have MoCA enabled - TiVO and some other DVRs use it.

You need to have a competent tech come out and take a look at your network. The fact that you have a high pass filter tells me you have something bad going on at your house that warranted dropping a high pass on your house. Of course at some point, if that’s the case, a maintenance crew will find your drop and high pass it at the tap. But with a filter that will kill your entire return path disabling your modem.

Source: corporate technical compliance for a MSO (not Comcast).