What do the lights on the modem mean?
The LEDs are for monitoring the status of the cable modem and its connection to the cable network. Power: Blinks while performing startup diagnostics internal to modem (after initial power-on or reset), and turns solid green when modem successfully completes diagnostics. Receive: Blinks while scanning for downstream frequency, and turns solid green when modem has successfully acquired a downstream channel. Send: Blinks while locating and ranging an upstream channel, and turns solid green when modem successfully ranges upstream channel. Online: Blinks while requesting an IP address (DHCP), downloading the configuration file (TFTP), and getting network time (TOD). It turns solid green when modem has successfully completed registration and is ready for use. Activity: Blinks when data is transmitted on the downstream or upstream connection. If there is no data traffic, the amber LED remains dark. PC/Activity (SB5100, SB5120 only): Lit solid when connected to computer via Ethernet or USB. F
The top light indicates signal strength, it must be a solid colour to obtain a connection. Green indicates an excellent signal strength, Orange indicates a very good strength and Red a good signal strength. The middle light is the battery indicator light. This light will be off if the battery is fully charged or not in use. Otherwise it may be solid yellow (battery charging), solid red (< 20% charged) or flashing red (< 10% charged). The bottom light is the power indicator which must be lit for the modem to be used. If it is not lit you must press the power button below this indicator.
