Cabletron Systems CSX100 series, User Manual, Page: 118 / 153

ISDN Router 104
ISDN NT1 LED is fast blinking
•
The router NT1 is having trouble negotiating the ISDN U interface
layer 1 protocol with the central office.
•
Check the connection cables.
ISDN line LED is off/blinking slowly
•
Unit with a U interface : a problem is occurring in the negotiation to
the network.
•
Unit with an S/T interface : a problem is occurring in either the
connection to the external NT1 or the connection to the network. To
ensure that an installed NT1 is operating properly, check the NT1’s
operational light. Refer to documentation supplied with the NT1
unit.
•
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 line channel LED is fast blinking
The router is having trouble negotiating SPIDs and DNs with the central
office.
Problems with the terminal window display
•
Ensure your console is plugged in and turned on.
•
Verify that you are on the right communications port (com1, com2)
•
Check the configuration parameters for speed, parity, etc. Make sure the
console is not in an XOFF state. Try entering a ‘
ctrl q ’.
•
Verify that the RS232 device attached to the console is configured as a
‘DTE’. If not, a crossover or null modem adapter is required.