It's slightly outdated but looks way neater than alot of the posts on here

None of that is rj11 all those cables are twisted pair, nothing to do with phone lines. Those blocks are used to terminate one cable to either a rj45 or another punch down. If there isnt another side to that panel then its punchdown to punchdown. 1->2, 3->4 etc.

Normally if its terminating from one line to another the first line is punched into the block directly, then the color coded c clip is placed over it and then another line is punched into the c clip.

Punch down block for RJ11 phone cables

The top is for splitting a phone line 8 ways. Cable splitter, and then a network patch panel

Close that up man and enjoy your tv

Someone was walled in long time ago as he was taking a selfie

Patch panel

The top one is really for telephone. But you could use it if it's punched down properly and the other end at the plate has rj45 connection. (Rj45 keystone)

The bottom is probably the one you want......to connect to your router or to your router via a Switch.

I had an apartment that had an abus audio system data closet looked very similar if you have abus controllers could be that as well

We should probably set up a generic sticky post for this exact setup which I feel like I see a couple times a week

Leave networking for those who learn it

50 years from now people will be asking this same question.

Plug all those blue cables into an unmanaged Ethernet switch, then plug your router into the nearest blue wall port. The router will feed the switch and the switch will feed the other wall ports