Chapter 7: Troubleshooting tips
Modem problem
Possible solution
■
Contact your service provider for assistance.
Front panel LED icons and error conditions
The T25 front panel LED icons provide status information for the following error conditions:
Table 8: Front panel LED icons and error conditions
LED Icon
Status
If, During Startup:
If, During Normal Operation
OFF
T25 is not properly plugged into
the electrical outlet
T25 is unplugged
BLINKING
Upstream (Send) channel or
Downstream (Receive) channel
cannot be acquired
Upstream channel is lost
Downstream channel is lost
BLINKING
IP registration is unsuccessful
IP registration is lost
OFF
Telephone is not detected
Telephone is disconnected
OFF
Telephone is not detected
Telephone is disconnected
SURFboard
®
T25 Cable Modem with Xfinity Voice User Guide STANDARD Revision 2.0
30
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