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Cisco ONS 15216 EDFA2/EDFA2-A Operations Guide, R2.4
July 2004
Chapter 10 Troubleshooting
10.1.3 Troubleshooting Equipment Alarms
10.1.2.3 LPOUT (Loss of Output Power) Alarm
This alarm is valid only when the ONS 15216 EDFA2 is in OPWR mode, which is rare because this mode
applies to few applications and is generally not recommended. This alarm occurs if the unit is in OPWR
mode and the output power is deviating more than the value of LPOUTDEV from the value of
LPOUTSETPT. The value of LPOUTHYST is used to clear the alarm. Use RTRV-TH-DWDM to find
the threshold values.
If both LPOUT and GAIN or LOS alarm conditions occur at the same time, only the GAIN or LOS alarm
is generated via TL1.
Possible causes for this alarm are:
• The input power may be too low to achieve the output power setting: Reduce the value of
PUMP2CTRLVALUE using the ED-DWDM command until the alarm clears.
• The LPOUTDEV value may be set too low for practical use: Increase the value of LPOUTDEV
using the RTRV-TH-DWDM command.
10.1.3 Troubleshooting Equipment Alarms
The ONS 15216 EDFA2 amplifier has two main categories of alarms: optical (DWDM) and equipment
(EQPT). The equipment alarms are directly related to general equipment conditions in the unit. The ONS
15216 EDFA2 has seven equipment alarms:
• CTMP
• LCRNT1
• LCRNT2
• LTMP1
• LTMP2
• PWRBUSA
• PWRBUSB
10.1.3.1 CTMP (Case Temperature Out of Range) Alarm
This alarm occurs when the case temperature is out of the threshold range as defined by MINCTMP and
MAXCTMP. The values of MINCTMPHYST and MAXCTMPHYST provide the hysteresis required for
the alarm to clear. Possible causes for this alarm are:
• The Min and Max thresholds may not reflect the ambient temperature where the ONS 15216 EDFA2
is located: Use RTRV-TH-EQPT to get the Min and Max temperature threshold and change the
threshold using SET-TH-EQPT.
• The ambient temperature is too high for a legitimate case temperature alarm to clear: Shut down the
ONS 15216 EDFA2 and allow time for it to cool, and do not repower it until the ambient temperature
is reduced.
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