4
6. Troubleshooting
LED overview
On your TC4400, you can find a number of LEDs that allow you to check the state of
the services oered by your TC4400.
LED State Description
Power On TC4400 powered on.
O TC4400 powered o.
DS On DownStream (DS) channels locked.
Blinking Locking downstream channels.
US On UpStream (US) channels locked.
Blinking Locking upstream channels.
Online On Connected to your service provider’s network.
Blinking Connecting to your service provider’s network.
O Not connected to your service provider’s network.
Link On Connected to an Ethernet device.
Blinking Connected to an Ethernet device and sending/receiving data..
O Not connected to an Ethernet device.
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 o your TC4400 or
unplug any cables!
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