thats certainly a mess -
the thin wired ones are phone cables - pull those out of the way to get a cleared picture
one cable should be coming up from the ground - i would expect that to connect into the spliter on the single side but i may be wrong - turn the splitter round and post a pic of that - assuming there is a cable rising from the ground where does it go to - is the the one thats disconnected
i am further puzzled by the fact all those cables are black but the internal one is white - there may be a joint somewhere or maybe the internal one is something else
you need to post some more info - if its not obvious you need to book a tech to sort it out
EDIT - looking again the spitter is doing nothing but there looks to be a cable behind it with a joint - is that coming from the ground and is it connected to the white internal cable - if so that looks useful
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Tony