Final answer:
The 'DS' or 'DOWNSTREAM' light on a cable modem indicates a good downstream connection when it is steady.
Step-by-step explanation:
The indicator light that shows whether a cable modem has a good downstream connection is typically labeled 'DS' or 'DOWNSTREAM'. When this light is steady, it indicates that the modem has established a proper downstream connection with your internet service provider's equipment. This is important for receiving data, as the downstream connection is the pathway for internet traffic coming into your home or business network. If the light is blinking, the modem is in the process of establishing a connection, and if it's off, no downstream connection is detected.