Cisco Systems 15216 EDFA2 manual Troubleshooting Typical Scenarios, Environmental Alarms

Chapter 10 Troubleshooting

Troubleshooting Typical Scenarios

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

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:

•PWRBUSA

•PWRBUSB

10.1.4.1PWRBUSA 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

Cisco ONS 15216 EDFA2 Operations Guide

78-16033-01 10-7