US Cable Support > Comcast HSI > 2012 Modem Poll

But the list is not 100% correct. I know of at least one Comcast supplied (and therefor approved) modem that is not on the list- the one I have. There could be others. I wonder what the additional letters after the Arris model numbers mean. For example, I have a TM602G/CT. The TM602G is the main part of the model number, but I wonder if the additional letters "CT" have an relevant meaning. A quick Google search suggests that they might:

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