11
Diagnostics
The Cable Modem has five status LEDs for diagnostics. You can monitor the LEDs
during installation and during normal operations.
Table 1 shows Cable Modem status LEDs and identifies what each LED light means.
This table will help you to diagnose problems.
Function Color
Definition
Cable
Green
- dark for no downstream RF carrier present or power
off
- flashing
slowly*
1
for downstream RF carrier present
and ranging in progress
- flashing
fast*
2
for registration in progress
- solid for the Cable Modem registered and ready to
transfer data
PC
Green
- dark for no carrier to/from PC present or power off
- solid for carrier to/from PC present
Data
Green
- dark for no user data going through the Cable Modem
or power off
- flashing for user data going through the Cable Modem
Test
Amber
- dark for initial self-test of the Cable Modem OK or
power off
- flashing for initial self-test of the Cable Modem in
progress or software down loading of the Cable
Modem in progress
- solid for self-test failure of the Cable Modem
Power
Green
- dark for power off
- solid for power on
Table 1 Status LEDs
＊
1 flashing slowly : flashing every 2 seconds (approximately)
＊
2 flashing fast : flashing every 1 second (approximately)
