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5
Troubleshooting
Investigating Hardware Installation Problems
CyberSWITCH 100 Router installation errors can cause the following problems:
POWER LIGHT IS OFF
•
Check that the power cord is firmly plugged into the back panel of the CyberSWITCH 100
Router and the other end into an active AC wall or power strip outlet.
•
Check that the power switch is turned on.
LEDs ARE FLASHING
•
The POST test has discovered a hardware error and the rightmost five LEDs flash an error code.
Contact Cabletron Systems Technical Support.
ISDN NT1 CHANNEL LED IS OFF/BLINKING SLOWLY
•
This LED is only active if an NT1 is installed. If the unit has an internal NT1, a problem is
occurring in the connection to the network.
•
Examine the phone line cable for frays. Check that each end is securely plugged in.
•
Contact the ISDN service provider to ensure the ISDN line is operational. If you have other
ISDN equipment that is operational, temporarily plug it into the wall jack to verify the ISDN
line out to the service provider.
ISDN NT1 LED IS FAST BLINKING
•
The router NT1 is having trouble negotiating the ISDN U interface layer 1 protocol with the
central office.
CyberSWITCH 100 Advanced User Information 47
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