User's Manual

ADCP-75-158 • Issue 1 • July 2003 • Section 5: Maintenance
Page 5-2
© 2003, ADC Telecommunications, Inc.
• Optical power meter (1550 and 1310 nm)
• TORX screwdriver (with T10 bit)
2 FAULT DETECTION AND ALARM REPORTING
The Digivance system on-board embedded software detects various unit and system faults and
reports them as either Major or Minor alarms. A Major alarm indicates that the system has
failed in a way that directly affects RF transport performance. This usually means that some
calls or perhaps all calls cannot be made over the system. A Minor alarm means that system
performance is not affected or in some cases, that the performance may no longer be optimal.
Four types of faults cause a minor alarm to be reported: overtemperature, fan failure, diversity
path failure, and an external minor fault (user defined fault). All other faults are reported as a
Major alarm.
Reporting of Major and Minor alarms is accomplished through the HU alarm contacts, the unit
front panel LED’s, the EMS software Graphical User Interface (GUI), and the Network
Operations Center - Network Element Manager (NOC/NEM) interface.
The HU is equipped with a set of both normally open (NO) and normally closed (NC) alarm
contacts which are used to report both Major and Minor alarms to an external alarm system. The
alarm contacts summarize the inputs so that any Major or Minor alarm will trigger an alarm
report to the external alarm system.
The HU, STM, and LPA front panel LED indicators are used to report specific alarms which are
reflected in the LED colors: Green, Red, Yellow, and Off. A description of the Host Unit, Linear
Power Amplifier, and Spectrum Transport Module LED indicators is provided respectively in
Table 5-1, Table 5-2, and Table 5-3.
The EMS software GUI provides both a summary and a more detailed list of alarm information
that includes unit and module level faults, circuit faults, and measured value faults such as
voltages, RF power, and temperature. A summary showing a list of all systems and their current
alarm status is presented through the Alarm OverView display. A detailed list of alarm
information is presented through the HOST alarm display and the REMOTE alarm display. All
the inputs that the system reports as alarms are shown in the HOST and REMOTE alarm
displays.
The NOC/NEM interface provides the same summary and detailed list of alarm information as
the EMS software GUI but in an ASCII text string format. Sending the command GET ALARM
SUMMARY produces a list of all systems and their current alarm status. Sending the command
GET ALARM ALL for a specific system will produce a detailed list of alarm information for
the specified system.