Note that there are different models of the 722 modem.

TM722A/B/S Models:

TM722G model:

This chart can help diagnose connection problems in the Arris TM722 modem. The lights on the front panel convey different messages depending on whether they are flashing or steady, and yellow or green.

When calling technical support of an internet provider such as Comcast/XFinity, they might want to know what these lights are doing during their problem solving session.