Downstream Power Levels

What happened to the Downstream Status on the Gateway at 10.0.0.1 ? I have the advanced screen enabled and I used to check the input signal to be between -7 and +7 dBm. Evidently, the advanced screen has disabled the connection screen. How am I supposed to verify the input signal integrity? (I don't have CATV so I can't use a cable box to check the value.)