Advanced Troubleshooting Procedures; Advanced Trouble Locating Procedures; Using The Xpm Footprint Tool - Nortel DMS-100 Series Maintenance Manual

Advanced troubleshooting procedures

Advanced trouble locating procedures

Normally you busy and test a defective component. As a result of this test, a
list of cards appears in the MAP terminal. The card at the top of the list is
the cause of the component problem. Replace the problem card and test the
component that was defective again. If the component passes this test,
return the component to service. This action completes the troubleshooting
procedure.
If normal troubleshooting procedures do not restore a component to service,
the component requires advanced troubleshooting procedures. Operating
company personnel use MAP responses from troubleshooting attempts that
failed, to formulate a maintenance plan. Use more advanced step action
procedures to repair a component problem. This section describes the XPM
footprint tool. The XPM footprint tool collects data when key events occur
in order to provide information on sync problems. The XPM footprint tool
aids troubleshooting.

Using the XPM footprint tool

The footprint tool collects data when key events occur in the Subscriber
Carrier Module–100S (SMS) to help the system determine the cause of
failures. The system stores the data in buffers that maintain all SMS restarts
and resets. The data buffers maintain SMS program reloads. You can
retrieve the data after an SMS outage. The memory buffers are a circular
queue of events that contain information about SMS operations and the
results of these operations. The system produces these buffers in either
hexadecimal or a readable format.
The XMS-based peripheral module (XPM) footprint tool contains two event
storage buffers. One store buffer is the active buffer, and the other is the
holding buffer. These buffers prevent overwriting of data saved from the
previous outage. When an outage occurs, the system swaps the active and
holding buffers. The system locks the buffer that was active before the
outage. This lock prevents overwriting of the buffer if the SMS goes
through multiple initializations.
DMS-100 Family SMS Maintenance Manual XPM10 and up
11-1