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Chapter 10
Troubleshooting
10.1.4 Environmental Alarms
The ONS 15216 EDFA2 amplifier has three main categories of alarms: optical (DWDM), equipment
(EQPT), and environmental (ENV). The environmental alarms are directly related to the power bus
voltage. The ONS 15216 EDFA2 has two equipment alarms:
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•
10.1.4.1 PWRBUSA and PWRBUSB (Power Bus) Alarms
These alarms occur when the Power Bus voltage is out of the threshold range as defined by
PWRBUSMIN and PWRBUSMAX. The power bus threshold has a 1.0V tolerance and a 1.0V hysteresis.
The 1.0V tolerance prevents most early alarm conditions due to a potential ±1.5V inaccuracy in the
ONS 15216 EDFA2 voltage measurement.
The problem may be an inappropriate setting of the Power Bus alarm or a power failure. First, check the
alarm thresholds using RTRV-TH-ENV. The default values are PWRBUSMIN=400 (-40 VDC) and
PWRBUSMAX=570 (-57 VDC). If the POWER LED is flashing, it means that the current voltage
applied to one of the power buses is outside that range. The command RTRV-ALARM-ENV responds
with which power buses outside of the range. If Power Bus B is not being used, check that
PWRBUSMODE=SIMPLE using RTRV-TH-ENV. If all the settings are correct, then verify the DC
voltage of the power source.
10.2 Troubleshooting Typical Scenarios
10.2.1 No Output Power after Adjusting Gain Settings
This issue occurs only with software version 2.1.0.
Release Notes 2.1.0 Caveat CSCdy50894
Issue: No output power after adjusting gain setting.
Description: The VOA pre-attenuator is stuck at maximum attenuation if the gain setting is modified
when the input power is below the minimum signal level.
Workaround: Use the following series of sample commands to recover from the VOA being stuck at
high attenuation:
For TL1:
name:ONS15216 EDFA2> ED-DWDM:name:all:100:::PUMP1CTRLMODE=PWR,PUMP1CTRLVALUE=50;
name:ONS15216 EDFA2> ED-DWDM:name:all:101:::PREATT=10;
name:ONS15216 EDFA2> ED-DWDM:name:all:102:::PUMP1CTRLMODE=GAINTEMP;
name:ONS15216 EDFA2> ED-DWDM:name:all:103:::OVERALLGAIN=160;
For ASH:
ash:hostname:ONS15216 EDFA2> snmp attribute set local cerent15216EdfaPumpCfgConstPumpPower 1 50
ash:hostname:ONS15216 EDFA2> snmp attribute set local cerent15216EdfaPumpCfgControlMode 1 constPower
ash:hostname:ONS15216 EDFA2> snmp attribute set local cerent15216EdfaVariableGainPreAttenuation 10
ash:hostname:ONS15216 EDFA2> snmp attribute set local cerent15216EdfaConstGainOverallGain 160
78-16033-01
F I N A L D R A F T - C I S C O C O N F I D E N T I A L
PWRBUSA
PWRBUSB
Troubleshooting Typical Scenarios
Cisco ONS 15216 EDFA2 Operations Guide
10-7
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Table of Contents
Troubleshooting
