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6. Troubleshooting
LED overview
On your TC4400, you can find a number of LEDs that allow you to check the state of
the services offered by your TC4400.
LED
State
Power
On
Off
DS
On
Blinking
US
On
Blinking
Online
On
Blinking
Off
Link
On
Blinking
Off
If the DS and US LEDs are blinking at the same time, your TC4400 is
updating its software. If this is the case, wait until the upgrade has been
completed. This can take several minutes! Do not power off your TC4400 or
unplug any cables!
Description
TC4400 powered on.
TC4400 powered off.
DownStream (DS) channels locked.
Locking downstream channels.
UpStream (US) channels locked.
Locking upstream channels.
Connected to your service provider' s network.
Connecting to your service provider' s network.
Not connected to your service provider' s network.
Connected to an Ethernet device.
Connected to an Ethernet device and sending/receiving data..
Not connected to an Ethernet device.
4
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