What is the maximum connection speed, that the Actiontec DSL Gateway support?After perusing the internet for confirmation as to the "theoretical firmware update", I found a few people that posed similar questions but no answers.
The maximum connection speed for an Actiontec DSL Modem or Gateway is 8Mbps downstream and 1Mbps upstream.
However, if the modem or gateway has a firmware update available that would upgrade it to ADSL2 or ADSL2+, then the maximum speed would be higher. The theoretical maximum speed for ADSL2 is 12Mbps and ADSL2+ is 24Mbps. But for ADSL2 or ADSL2+ to provide the higher speeds of which they are capable, the ISP must fully support the ADSL2 and ADSL2+ standard as well.
A few days later, I awoke to the internet being down. It consistently failed to sync, and after resetting the router, I determined this was likely due to the speed upgrade. My last-ditch effort was to download a firmware update from Qwest (QW06.5-22.214.171.124.8.5 for Mac or Windows). After upgrading, the modem worked like a charm. This should also work with the GT701, as they use the same firmware.
So the answer is yes. If you have an Actiontec GT701R DSL modem with the latest firmware, it can at least support ADSL2+ at 12Mbps.