User Manual

ADCP-75-179 • Preliminary Issue A • September 2004 • Section 4: maintenance

Page 4-6

3 FAULT ISOLATION AND TROUBLESHOOTING

Alarm information may be accessed using the HU and STM front panel LED indicators, the

EMS software GUI, the NOC-NEM interface, or the SNMP manager. When an alarm occurs,

use the unit LED indicators and any one of the specified software tools to determine which

Digivance system is affected, which unit (HU or STM) reported the alarm, and the fault that

generated the alarm. Then refer to either Section 3.1 Host Unit Troubleshooting or Section 3.2

STM Troubleshooting to isolate the problem and to determine the corrective action required. If

an LPA problem is reported by the STM, refer to Section 3.3 LPA Troubleshooting for the

troubleshooting procedures that apply to the LPA.

When attempting to isolate a problem, always determine the initial fault that generated the

alarm report. Some faults may cause additional faults to be reported which tends to obscure the

initial reason for the alarm. To help isolate faults, the EMS GUI provides an AlarmOverview

screen, shown in Figure 4-1, that indicates which Digivance system/unit is reporting the alarm.

Figure 4-1. AlarmOverView Screen

The AlarmOverview screen includes an ALARM HIST indicator which the user should click to

acknowledge that an alarm exists. Acknowledging the alarm opens the Alarm History Info

dialog box (also shown in Figure 4-1) which directs the user to view the EMS Log file for

details. The EMS Log file lists the various faults in the order in which they occurred. Clear each

fault starting with the initial fault. In most instances, clearing the initial fault will also clear any

remaining faults. For additional information on using the AlarmOverview screen, refer to the

Digivance Element Management System Version 3.01 User Manual (ADCP-75-151).

Note: It is recommended that if there are alarms at both the HU and STM, the optical

faults should be checked and cleared first. Because the HU and STM function as a system,

a fault in the fiber optic link will cause alarms to be reported by both the HU and STM.

Click to acknowledge

alarm and to open Alarm

History Info dialog box

Click to clear alarm

history fault indicator

and to close Alarm

History Info dialog box