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 5-51 Packet Bus Fault Isolation and Repair 
5
nTN570 Expansion Interface. A failure of the Expansion Interface typically 
causes all packet traffic in the connected EPN or Center Stage Switch to 
fail. If the failure is on the packet bus interface, the packet bus may be 
alarmed as well.
If an active Expansion Interface failure causes a packet bus...

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 5-52 Packet Bus Fault Isolation and Repair 
5
Failure of any circuit pack’s bus interface may alarm the packet bus due to 
shorting of the packet bus leads. This typically disrupts 
all packet bus traffic in 
the affected PN. A failure of the packet bus in the PPN affects packet traffic in the 
EPNs as well. Some packet bus failures do not affect...

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 5-53 Packet Bus Fault Isolation and Repair 
5
packet bus failure a catastrophic problem. The only way an EPN packet bus 
failure can affect TDM traffic is via possible impact on system response time in a 
large switch due to running of ISDN-BRI endpoint maintenance. This should 
rarely happen because the packet bus maintenance software is able to...

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 5-54 Packet Bus Fault Isolation and Repair 
5
nA packet bus Uncorrectable report is sent from the Maintenance/Test 
packet bus port (M/T-PKT).
When such a failure occurs, a PKT-BUS error is logged. Refer to the PKT-BUS 
section in Chapter 9 for more detailed information.
Fault Correction Procedures: Overview
This section gives an overview of 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 5-55 Packet Bus Fault Isolation and Repair 
5
and ‘‘AUX-TRK (Auxiliary Trunk)’’, sections in Chapter 9, ‘‘Maintenance Object 
Repair Procedures’’.
NOTE:
All Maintenance/Test circuit packs must be of TN771D vintage or later.
TN771D Packet Functions
The Maintenance/Test packet bus port (M/T-PKT) provides the packet bus 
testing and reconfiguration...

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 5-56 Packet Bus Fault Isolation and Repair 
5
TN771D in Standalone Mode
In TN771D standalone mode, a terminal is connected to the Maintenance/Test 
circuit pack with an Amphenol connector on the back of the cabinet. This setup 
allows direct inspection of the packet bus and identifies shorted or open leads. 
This mode does not use the usual MT...

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 5-57 Packet Bus Fault Isolation and Repair 
5
nA slot in the A carrier is preferable for EPNs if the above conditions are 
met.
Entering and Exiting Standalone Mode
When in standalone mode, the red LED on the TN771D is lit This is normal and 
serves as a reminder to remove the TN771 from standalone mode.
!CAUTION:
The TN771D in standalone must be...

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 5-58 Packet Bus Fault Isolation and Repair 
5
2. Insert the TN771D circuit pack into the slot. The system will not recognize 
the presence of the circuit pack.
If the standalone mode is entered successfully, the following is displayed on the 
connected terminal:
!CAUTION:
If the above display does not appear, check the wiring between the 
terminal...

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 5-59 Packet Bus Fault Isolation and Repair 
5
Below is an example of a standalone mode display. The symbols above the line 
represent specific leads on the backplane. The bottom line indicates the 
following:
NOTE:
This information is available only from the standalone mode. It is not 
available from the MT or a remote login.
Figure 5-12
 shows 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 5-60 Packet Bus Fault Isolation and Repair 
5
Figure 5-12. Packet Bus Leads on the Backplane
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