Nortel 1000E Maintenance Manual page 90

Page 90 of 162 Clearing faults
Table 20
MG 1000T Core fault causes and actions (Part 3 of 3)
Condition
System constantly
rebooting
Nortel Networks logo is
not lit or fan is not
running
Perceived one way
speech path, broken
speech or static on the
line
553-3041-500 Standard 1.00
Possible cause
Defective NTDK83 IP
Daughterboard
Defective NTDK20 SSC
card
Defective SSC card or
Media Gateway
Loss of AC power
Defective Media
Gateway
MG 1000T Core SSC
has lost synchronization
with its clock reference
September 2004
Action
Unseat the NTDK20 SSC circuit card
and replace the IP daughterboard.
Reinsert the NTDK20 SSC circuit card.
If the fault persists, replace the NTDK20
SSC card. Reuse all daughterboards
and the security device installed on the
original NTDK20 SSC circuit card.
Enable and test the card by entering:
LD 30
TEST
If the new card passes the test, the
original NTDK20 SSC circuit card was
defective.
If after a few minutes the problem
reoccurs, replace the Media Gateway.
Replace the SSC card or Media
Gateway.
Restore AC power.
Replace the Media Gateway.
Enable and test the cards by entering:
LD 30
TEST
Ensure that zero bandwidth parameter is
set to NO
LD 117
PRT IPR <port>
LD 117
CHG IPR <port> <MAC address>
[<IP address> <subnet mask>
<zero bandwidth>]