What are the maximum data speeds supported by this modem?

For downstream, the modem supports up to 5Gbps via two 192MHz DOCSIS 3.1 OFDM channels, or up to 1372Mbps via 32 DOCSIS 3.0 downstream channels. For upstream, it supports up to 2Gbps via two 96MHz DOCSIS 3.1 OFDMA channels, or up to 246Mbps via 8 DOCSIS 3.0 upstream channels. Actual speeds may vary based on network configuration and connected devices. (Pages 7–8)

From the official Spectrum Business D3 1 Advanced Voice Modem manual, page 7

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