You can also glean a little more information reading Cisco CMTS
documents system messages docwiki
I read enough to understand how they 'communicate' and 'interact' with the cable modem's. Since then, I don't feel too stressed over it like when the modem logs are peppered with T3's and T4's and seemingly arcane codes like D106.0, R02.0, T05.0.
After a while you start to grasp how it works and kind of understand why sometimes the engineer guy on the other end doesn't get too concerned when people come screaming about an abundance of modem logs that make it look like something bad happened. We are after all, not Cisco engineers, so this foreign stuff looks intimidating to the uninitiated.--
You see there is only one constant. One universal. It is the only real truth. Causality. Action, reaction. Cause and effect.