Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
DOCSIS
Table title:
Throughput
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=3 > Version </th><th colspan=6 rowspan=1 > Downstream </th><th colspan=5 rowspan=1 > Upstream </th></tr>
<tr> <th colspan=4 rowspan=1 > Channel configuration </th><th colspan=1 rowspan=2 > DOCSIS throughput in Mbps </th><th colspan=1 rowspan=2 > EuroDOCSIS throughput in Mbps </th><th colspan=1 rowspan=2 > Throughput in Mbps </th></tr>
<tr> <th colspan=1 rowspan=1 > Minimum selectable number of channels </th><th colspan=1 rowspan=1 > Minimum number of channels that hardware must support </th><th colspan=1 rowspan=1 > Selected number of channels </th><th colspan=1 rowspan=1 > Maximum number of channels </th><th colspan=1 rowspan=1 > Minimum selectable number of channels </th><th colspan=1 rowspan=1 > Minimum number of channels that hardware must support </th><th colspan=1 rowspan=1 > Selected number of channels </th><th colspan=1 rowspan=1 > Maximum number of channels </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1.x </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td class="highlighted"  colspan=1 rowspan=1 > 42.88 (38) </td><td class="highlighted"  colspan=1 rowspan=1 > 55.62 (50) </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 10.24 (9) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2.0 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td class="highlighted"  colspan=1 rowspan=1 > 42.88 (38) </td><td class="highlighted"  colspan=1 rowspan=1 > 55.62 (50) </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 30.72 (27) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 3.0 </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > m </td><td colspan=1 rowspan=1 > No maximum defined </td><td class="highlighted"  colspan=1 rowspan=1 > m × 42.88 (m × 38) </td><td class="highlighted"  colspan=1 rowspan=1 > m × 55.62 (m × 50) </td><td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > n </td><td colspan=1 rowspan=1 > No maximum defined </td><td colspan=1 rowspan=1 > n × 30.72 (n × 27) </td></tr>
<tr> <td colspan=1 rowspan=1 > 3.1 </td><td colspan=1 rowspan=1 > 1 (m1 = 3) OR 1 (m2 = 1) </td><td colspan=1 rowspan=1 > 2 (m1 = 64) AND 24 (m2 = 24) </td><td colspan=1 rowspan=1 > m1 m2 </td><td colspan=1 rowspan=1 > No maximum defined </td><td colspan=1 rowspan=1 > m1 × 64.32 (m1 × 54) m2 × 42.88 (m2 × 38) </td><td colspan=1 rowspan=1 > N/A </td><td colspan=1 rowspan=1 > 1 (n1 = 1) AND/OR 1 (n2 = 1) </td><td colspan=1 rowspan=1 > 2 (n1 = 32) AND 8 (n2 = 8) </td><td colspan=1 rowspan=1 > n1 n2 </td><td colspan=1 rowspan=1 > No maximum defined </td><td colspan=1 rowspan=1 > n1 × 64.32 (n1 × 54) n2 × 30.72 (n2 × 27) </td></tr>
</table>
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).