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User’ Guide
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4. Cable Modem LEDs and Connectors
This chapter describes the functions of the cable modem’s LEDs and connectors.
When the PWR, SYNC, and READY LEDs are lit, the cable modem is working properly. The
USB or ENET LED 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
and what the LEDs mean.
LEDs on the Front of the Modem
• power: 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
• enet: Indicates connectivity between the ethernet port on the cable modem and the
PC’s ethernet port.
• send: Indicates that data is being transmitted from the cable modem to the cable
network.
• recv: Indicates that data is being received from the cable network.
• 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.
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