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Is your Comcast service conveyed by a cable, like cable TV cable? or is it via fiber, phone line, etc.?
And as for a device to allow both complex and simple/'easy' WiFi passwords... there isn't *one* device, but you could use two WiFi routers with different WiFi passphrase security settings, both connected to a small switch or hub, and that switch or hub connected to your main modem (unless your main modem has two spare Ethernet ports on it instead of just one, or if it has a USB port too and one router can connect by USB ... some Linksys routers in the old days had this option, though I'm not sure that any still do... you could go without the switch or hub.)
Let me know, and I will advise you more specifically.
The question is: can your modem (and/or your router), by themselves, A. accept cable/Coaxial-TV-cable input? and B. can they decode and authorize the Comcast signal? (NOTE: the modem you have 'can' decode Comcast signal *if* when hooked up to the cable to their gateway as it is, in place of their gateway, you can receive internet of any kind through it.) ... I strongly suspect 'no', in either or both A. &/or B.
I was thinking splitting after their gateway box, on the LAN scale as it were. So you'd have two WiFi networks with different passwords and differing levels of security/password *****
The splitter would probably be good enough as a 'passive' splitter, from what I know of these things.
Whether that splitter would work is another question also. Does your Comcast cable line use SDI, and is it either 270 Megabits per second, or anything up to 540 Megabits per second?
OK. If you can get that working with a non-passive / powered splitter, such as the one you cited for example from Amazon, then all to the good. Whether it will work or not... to some extent depends upon whether you can get it to work. After all, the Comcast tech tried for several hours to get a different splitting hookup working... so it was within possibility in that tech's view, that you might be able to get such a hookup working perhaps.
Perhaps that failed simply because the coaxial line isn't really bearing as strong a signal as it should, for whatever of various reasons, from Comcast's equipment farther up the line.
If you think it is worth a try, by all mean go ahead.
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Great! I hope it does work. At any rate it's a possibly feasible effort for sure.
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