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This can be used to prevent very low frequency interference, or to block unauthorized cable modems from attempting to contact the head end, or even to remove TV service from your line while leaving HSD up.
For example, if your cable modem is to talk back to your provider at 29.5Mhz, and this HPF was on your line, your provider would never hear it, because it's below 50Mhz.
If you are having interference on your TV channels while online, try putting a HPF on the TV lines at the splitter. Do NOT filter your cable modem line or you will kill your connection.
I've seen HPFs that run from 50MHz up to 550Mhz.
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