Cisco Systems 15216 EDFA2 10.2 Troubleshooting Typical Scenarios

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CiscoONS 15216 EDFA2 Operations Guide

78-16033-01

Chapter10 Troubleshooting

Troubleshooting Typical Scenarios

The ONS 15216EDFA2 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

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 th e

ONS 15216EDFA2 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 t hat

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

This issue occurs only with software version 2.1.0.

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