Lucent Technologies DEFINITY Enterprise Communications Server Release 6 Instructions Manual

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-61 Packet Bus Fault Isolation and Repair 
5
Figure 5-13. Packet Bus Leads on the Backplane
+5v
LP
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L7
L8
H0
SB
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H4
SF
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H7
H8
GND
SS  CLK
GND GND
+5v +5v  +5v+5v
+5vL5 L1
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DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-62 Packet Bus Fault Isolation and Repair 
5
Special Precaution Concerning the TN771D
A TN771D Maintenance/Test circuit pack must be taken to the customer site if:
nThe Maintenance/Test packet bus port indicates that a Packet Bus fault is 
present by logging a Major or Minor alarm against PKT-BUS. A Major 
alarm is indicated in the error log by...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-63 Packet Bus Fault Isolation and Repair 
5
if the packet bus problems are not resolved via the first set of repair procedures. 
However, a packet bus failure can lead to a somewhat haphazard referencing of 
various MO procedures that may result in taking steps that are repetitive or 
unnecessary. If this occurs, return to the flowchart at the...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-64 Packet Bus Fault Isolation and Repair 
5
Figure 5-14. Troubleshooting Packet Bus Problems (Page 1 of 2)
Boldface letters in the flowchart refer to paragraphs in the explanatory section 
that follows.
YES
YESYES
YESYES
YE S YE S YES
NO
NO
NO
NO
To
page
2NO NO
NO NOAAre there
alarms or errors
TDM -CLK?
CIs only
asinglePN
affected?
DAre there...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-65 Packet Bus Fault Isolation and Repair 
5
Figure 5-15. Troubleshooting Packet Bus Problems (Page 2 of 2)
Boldface letters in the flowchart refer to paragraphs in the explanatory section 
that follows.
Flowchart Notes
The following paragraphs refer by letter to corresponding entries in the 
preceding flowchart. Individual errors and alarms are...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-66 Packet Bus Fault Isolation and Repair 
5
Object Repair Procedures’’, any that do not refer explicitly to the TDM bus 
(except TDM-CLK) should be considered a possible cause of packet bus 
problems.
a. Problems with the system clock (TDM-CLK) can cause service disruptions 
on the packet bus. All alarms active against TDM-CLK should be resolved...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-67 Packet Bus Fault Isolation and Repair 
5
j. The answer is yes if any of the following apply:
nThe TN771D in standalone mode indicates any faulty leads.
nTest #572 in the PKT-BUS test sequence fails.
nThe status port-network P display indicates that faulty leads are 
present and the TN771D in the port network is known to be 
functioning...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-68 Packet Bus Fault Isolation and Repair 
5
If test results or the results of the status port-network command indicate that 
there are 24 faults on the packet bus, the problem is probably caused by faulty 
cables between carriers, or by defective or missing bus terminators. However, 
before proceeding, make sure that the Maintenance/Test packet...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-69 Packet Bus Fault Isolation and Repair 
5
Troubleshooting Procedures
Packet bus faults are usually caused by a defective circuit pack connected to the 
backplane, by bent pins on the backplane, or by defective cables or terminators 
that make up the packet bus. The first two faults cause shorts, while the third fault 
causes either shorts or...

DEFINITY Enterprise Communications Server Release 6
Maintenance for R6r Volumes 1 & 2  555-230-126  Issue 2
January 1998
Responding to Alarms and Errors 
Page 5-70 Packet Bus Fault Isolation and Repair 
5
Procedure 1
Procedure 1 determines whether any circuit packs that use the packet bus have 
faults. For each circuit pack type in Table 5-3
 proceed through the steps below. 
Check the circuit pack in the order presented by the flowchart which appears 
earlier in this discussion unless newly inserted...