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The 678 will work with all of their regular ADSL offerings (the 7Mbps/1.0Mb and slower services).
However since the 678 does not support ADSL2+ it will not work with the more recent (and rarer) 12Mbps and 20Mbps Qwest offerings.
Regardless of what some Qwest representatives may say, the modem WILL work (with the 7Mbps and lower offerings). Any confusion about this is likely due to the fact that the 678 is no-longer sold or officially supported by Qwest.
A note regarding PPPoE and PPPoA and the Cisco 678 modem:
Qwest has switched to using PPPoE in many areas, and the 678 does not internally support PPPoE authentication. If you live in one of the areas where PPPoE is the only authentication available and you want to use the 678, you will need to put the modem into bridged mode and use a device (PC or router for example) to do the PPPoE authentication.