User's Manual

ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 4: MAINTENANCE

Page 4-2

2 FAULT DETECTION AND ALARM REPORTING

The Digivance LRCS on-board embedded software detects various unit and system faults which

generate ether a Major or Minor alarm. A Major alarm indicates that the system has failed in a

way that directly affects RF transport performance. When a major alarm occurs, all RF

functions are disabled and the system is out of service. A Minor alarm means that system

performance is not affected or in some cases, that the performance may no longer be optimal.

When a minor alarm occurs, RF functions continue and the system remains in service.

The following means are used to report Major and Minor alarms:

• HU alarm contacts

• HU and RU LED’s

• EMS software Graphical User Interface (GUI)

• Network Operations Center - Network Element Manager (NOC/NEM) interface

• SNMP interface

The HU is equipped with a set of both normally open (NO) and normally closed (NC) alarm

contacts which may be 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 is equipped with multiple front panel LED indicators that show status and alarm

information by displaying various colors: Green, Red, Yellow, and Off. The RU is equipped

with a single LED indicator that shows status and alarm information by displaying either Red or

Off. A detailed description of the Host Unit and Remote Unit LED indicators is provided

respectively in Table 4-1 and Table 4-2.

The EMS software GUI provides both a summary and a 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 more detailed list of alarm

information is presented through the HOST alarm display and the REMOTE alarm display. The

various fault conditions that trigger a major or minor alarm report are shown in the HOST and

REMOTE alarm displays.

The NOC/NEM interface provides the same summary and detailed listing of alarm information

as the EMS software GUI but in an ASCII text string format. Sending the command GET

ALARMSUMMARY 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.

The SNMP interface provides alarm information to up to ten SNMP managers which must be

registered with the SNMP agent. The SNMP interface allows the SNMP managers to receive the

alarm and status information generated by the host and remote units. The presentation of the

alarm information is dependent on the features of the SNMP manager.