this post was submitted on 20 Nov 2023
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Home Networking
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What are the signal levels at your cable modem? In your diagram the only device that is using the signal on the cable from outside your house is the cable modem, yet it looks like you've got the cable modem 2 spitters and at least a 10.5 dB loss away from the incoming drop.
I think I'd reorganize the splitters to maximize the signal to the modem. Put the 2-way splitter on the cable from outside, run a cable from one side of the 2-way splitter directly to the modem, patch the other side of the 2-way to the input of the 4-way splitter and attach all the MoCA devices to the 4-way splitter. That should give you an instant 7 dB improvement in the signal delivered to the modem. For bonus points add a MoCA filter between the 2-way and 4-way to keep the MoCA signalling out of the modem, replace the 4-way splitter with a 3-way to eliminate the open port and make sure the new 3-way splitter is one specifically designed for MoCA.