| 1 | A | B | C | D | E | F | G | H | I | J | K | L |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 2 | DOCSIS - Throughput |  |  |  |  |  |  |  |  |  |  |  |
| 3 | Version | Downstream | Downstream | Downstream | Downstream | Downstream | Downstream | Upstream | Upstream | Upstream | Upstream | Upstream |
| 4 | Version | Channel configuration | Channel configuration | Channel configuration | Channel configuration | DOCSIS throughput in Mbps | EuroDOCSIS throughput in Mbps | Throughput in Mbps | - | - | - | - |
| 5 | Version | Minimum selectable number of channels | Minimum number of channels that hardware must support | Selected number of channels | Maximum number of channels | DOCSIS throughput in Mbps | EuroDOCSIS throughput in Mbps | Throughput in Mbps | Minimum selectable number of channels | Minimum number of channels that hardware must support | Selected number of channels | Maximum number of channels |
| 6 | 1.x | 1 | 1 | 1 | 1 | 42.88 (38) | 55.62 (50) | 1 | 1 | 1 | 1 | 10.24 (9) |
| 7 | 2.0 | 1 | 1 | 1 | 1 | 42.88 (38) | 55.62 (50) | 1 | 1 | 1 | 1 | 30.72 (27) |
| 8 | 3.0 | 1 | 4 | m | No maximum defined | m × 42.88 (m × 38) | m × 55.62 (m × 50) | 1 | 4 | n | No maximum defined | n × 30.72 (n × 27) |
| 9 | 3.1 | 1 (m1 = 3) OR 1 (m2 = 1) | 2 (m1 = 64) AND 24 (m2 = 24) | m1 m2 | No maximum defined | m1 × 64.32 (m1 × 54) m2 × 42.88 (m2 × 38) | N/A | 1 (n1 = 1) AND/OR 1 (n2 = 1) | 2 (n1 = 32) AND 8 (n2 = 8) | n1 n2 | No maximum defined | n1 × 64.32 (n1 × 54) n2 × 30.72 (n2 × 27) |

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).