On - indicates that the cable modem is properly connected to the computers Ethernet port. Send Flashing - the cable modem is sending data to the internet. Receive Flashing - The cable modem is receiving data from the internet. On - indicates that the cable modem is properly connected to the computers USB port. Ethernet Off - the Ethernet port is not in use. Flashing - cable modem is transferring data over the Ethernet cable. Light patterns, images, manuals and more helpful info for the. Ambit U10C018 cable modem Power Off - modem is not receiving power On - modem power is activated and receiving power. USB Off - no USB connection is present Flashing - cable modem is transferring. Flashing Quickly - modem is downloading the configuration file. On - modem aqcuired Notes and Useful Information Installation Manual,.pdf (1.01MB) Manufacturer Website Manufacturer Product Page Manufacturer Support Page. During initialization, LED flashes slowly to indicate that the cable modem is searching for a downstream channel. Sync On - the cable modem has established a downstream channel. Ready Off (POWER and SYNC are lit) - modem is disabled for service Flashing Slowly - modem.