Assertion: splitter's port | /r/HasProperty | an impedance mismatch
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text: A practical concern is that if you do not have a TV (or other cable device) as well as a cable modem connected to your cable service, you should not put the splitter in your line, because an unconnected port on a splitter is an impedance mismatch (specifically, it has infinite impedance, also known as an open circuit) which will degrade the signal for the other device.