Document: DOCSIS.pdf
Question: What speeds did the first three version of DOCSIS and EuroDOCSIS support?
Answer: The first three versions of the DOCSIS standard supported a downstream throughput with 256-QAM of up to 42.88 Mbit/s (38 Mbit/s after overhead), or 55.62 Mbit/s for EuroDOCSIS (50 Mbit/s after overhead).