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72 TROUBLESHOOTING
Symptom
T1 Status LED is
red.
WAN Status LED
is yellow.
WAN Status LED
blinks green or
yellow.
Serial Status
LED is not
illuminated
Serial Status
LED is red.
Copyright © 2005-2007, Nortel Networks
.
Cause
The T1 link
is faulty.
(The Secure
Router 3120
has detected
an abnormal
incoming signal.)
The T1 link is
faulty (far-end
system has
detected an
abnormal
incoming T1
signal).
The T1 link is
not properly
configured at
one or both ends
or it is operating
marginally.
Cable not
connected.
Incorrect cable
or mode
configuration
Incorrect bundle
configuration
Secure Router 3120
Installation Guide
NN47260-300 02.01 Standard
9.2 10 January 2007
Action
If a T1 LOS (loss of signal) alarm is
present:
1. Check the T1 cable connections
to the Secure Router 3120. If
you are using a non-Nortel cable,
see
"Cable Pinouts" (page 78)
more information.
2. If the cable is good, perform a
BERT test on the T1 link.
3. If the BERT test passes, check
the WAN link between the two
ends with external test equipment.
If the link is good, the Secure
Router 3120 is faulty.
Perform the BERT test (and other
steps above from the far end) in
conjunction with a T1 line loopback at
the Secure Router 3120.
1. If frame errors are present, look
for a configuration mismatch
between the Secure Router 3120
and the far-end system.
2. If CRC-6 errors or BPVs are
present, check the T1 Line Build
Out (LBO) configuration settings
at both ends.
Verify that the cable is connected
and properly secured. If a cable is
connected and the LED remains Off,
the cable does not support the "type"
bits as specified for the Smart Serial
interface.
To verify the cable type and mode
configuration settings, enter show
module config serial 1.
To verify the bundle configuration,
enter show interface bundle
<bundlename> .
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