Lucent Technologies PortMaster PM-2, Hardware Installation Manual

Page: 53 / 88

Troubleshooting A-3
Observing LED Behavior
After an ISDN S/T unit
boots, an ISDN S/T status
LED turns off. The BRI is not able to
synchronize with the
attached NT1. Ensure that the correct directory
numbers have been assigned to each
port of the BRI. Ensure that the cable
connecting the BRI and the NT1 is
securely attached. If the problem
persists, contact your service
provider.
After an ISDN U unit
boots, an ISDN U status
LED blinks once per
second or turns off. No SPID is set on the port. Verify that the correct SPID has been
assigned to the port and that the
correct switch type is set. See the
Command Line Administrators Guide
for the appropriate ISDN BRI
commands.
There is no circuit to the
telephone company. Verify that the BRI cable is securely
attached. If the problem persists,
contact your service provider.
During operation, the
system LED remains
solidly on or completely
off. A hardware problem might
have been caused by an
external device. Disconnect all external devices except
the diagnostics terminal or PC. If the
LED is still solidly lit or completely
off, contact Lucent Remote Access
Technical Support.
No console login prompt is
displayed. Console terminal settings
are incorrect, or a
connection or cable is
inoperable. • Verify terminal settings of 9600bps,
8 data bits, 1 stop bit, a parity of
none, and software control
(XON/XOFF).
• Verify that DIP switch 1 is UP.
• Verify that you have a working null
modem cable and that it is properly
connected at both ends. For cable
information see “Pinout
Specifications” on page B-1.
Table A-1 Hardware Problems and Solutions (Continued)
LED Behavior Possible Cause Solution