The red tape on some of the lines you see, label them as fiber optic cable. None of those fiber lines appear to go into that silver enclosure, but it is possible that the enclosure is connected to something just out of the reach of the pic. Could be part of a small cell 5G network node, but it seems a bit small for that. May be an amplifier/power conditioner or otherwise related to DSL or cable internet/TV feeds. Looks more like a splice box, though - simply used to splice and weather-protect lines.