Contents

Introduction

Troubleshoot "Auto Ampli Control Disabled Alarm" in NCS1K

Introduction

This document describes how to troubleshoot the low transmit power from the amplifier by clearing the "Auto ampli control disabled" alarm.

Troubleshoot "Auto Ampli Control Disabled Alarm" in NCS1K

You see low transmit power and low gain from the Erbium Doped Fiber Amplifier (EDFA) since the Auto Ampli control is disabled.

show controller ots 0/x/0/x:

Amplifier performance values

Alarm on the node

The "Auto Ampli Control Disabled" alarm raises if the power level difference between two channels exceeds the delta value configured.

In this case, the Delta value was 5dB but the difference between the channels was more than 5dB,

show hw-module slot x channel-trail-view active :

channel power view

Here some channels receive power as -12.xx and channel no 21 receives power as -18.xx, so the difference is 6dB which is more than the Delta value.

When the difference is more than the delta value, the Amplifier control is disabled. You still see the output power but the gain regulation does not happen as per design.

To check the delta value:show controler ots 0/x/0/x

Sample Output:

controller State: Up

Transport Admin State: In Service

Port Type: Line

Laser State: On

Optics Status::

Alarm Status:

-------------

Detected Alarms:

AUTO-AMPLI-CTRL-DISABLED

Alarm Statistics:

-----------------

LOW-RX-PWR = 0

LOW-TX-PWR = 0

RX-LOS-P = 5

RX-LOC = 1

AMPLI-GAIN-DEG-LOW = 0

AMPLI-GAIN-DEG-HIGH = 0

AUTO-LASER-SHUT = 5

AUTO-POW-RED = 5

AUTO-AMPLI-CTRL-DISABLED = 5

AUTO-AMPLI-CFG-MISMATCH = 0

SWITCH-TO-PROTECT = 0

AUTO-AMPLI-CTRL-RUNNING = 2

Parameter Statistics:

---------------------

TX Power = 3.80 dBm

RX Power = -9.70 dBm

Ampli Gain = 19.50 dB

Ampli Tilt = 0.00

Total TX Power = 4.09 dBm

Total RX Power = -8.50 dBm

Ampli Gain Range = Normal

Ampli Safety Control mode = auto

Osri = OFF

TX Enable = Enabled

RX Enable = Enabled

RX Span Loss = N/A

TX Span Loss = N/A

Rx Low Threshold Current = -25.0 dBm

Back Reflection = -27.30 dBm

Configured Parameters:

-------------

Rx Low Threshold = -25.0 dBm

Tx Low Threshold = -20.0 dBm

Ampli Gain = 1.00 dB

Ampli Tilt = 0.00

Ampli Channel power = 3.00 dBm

Channel Power Max Delta = 3.00 dBm

Ampli Channel Psd = 31.250 nW/MHz

Rx Low Threshold Psd = 0.099 nW/MHz

Ampli Control mode = Automatic

Ampli Safety Control mode = auto

Osri = OFF

TX Enable = Enabled

RX Enable = Enabled

Here the delta value is 3dB and the difference between the channels was 6dB.

Permanent Solution:

Check the patchpanel for the channels that have less power.

Clean/replace the patch cords if required in order to improve the channel power.

Once the power becomes equal to or less than the delta value, the alarm clears and the output power gets regulated as required.

Workaround:

A temporary workaround is to increase the delta value with these configuration changes to restore the traffic:

config ter

controller ots 0/x/0/x

channel-power-max-delta 80 (change delta to 8)

Ensure to revert the configuration to the default delta value once the permanent solution gets implemented.