I have Netgear CM500 currently, which apparently doesn't support 400Mbps. (I was never told this by the agent when I was upgrading the plan.)
So I want to upgrade the modem, but I want to know:
1) if I buy a DOCSIS 3.1 modem like Netgear CM1000, will the physical layer of the service I get also DOCSIS 3.1? (OFDM, etc...)
2) or will it work as a backward compatible mode on DOCSIS 3.0 instead?
I know Xfinity 1Gbps is DOCSIS 3.1 only, but it seems like Xfinity 400Mbps (Extreme 400) also supports DOCSIS 3.0, so I want to clarify this.
Because if I buy a 3.1 modem but it works on 3.0 mode then I don't have to waste money on it.
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