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4. Cable Modem Router LEDs and Connectors
This chapter describes the functions of the cable modem router’s LEDs and connectors.
When the pwr, sync, and ready LEDs are lit, the cable modem router is working properly. The
usb or enet 1, 2, 3, 4 LEDs should also be lit depending on what port is being used.
The following provides an overview of the LED indicator lights on the front of the cable modem
router and what the LEDs mean.
LEDs on the Front of the Modem
• pwr: Indicates that the cable modem has successfully completed internal power-on
tests.
• usb: Indicates connectivity between the USB port on the cable modem and the PC’s
USB port.
• sync: Indicates the connection status between the cable modem and the cable network.
The LED is lit when the cable modem has established a downstream channel with the
cable service provider’s Cable Modem Termination System (CMTS).
• ready: Indicates that the cable modem has completed the ranging/registration process
and is ready to send/receive data.
• Ethernet 1, 2, 3, 4: Indicates connectivity between the Ethernet port on the cable
modem router and the Ethernet port on a PC or Mac. This LED blinks when the cable
modem router is transferring or receiving data over the Ethernet cable.
Installation problems with the cable modem are commonly due to the cable network and its topography.
LEDs on the front panel of the cable modem reveal operational status and help you determine problem
areas.
_____Ethernet____
pwr usb sync ready 1 2 3 4