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Digital Optical Monitoring - DOM

 

 

 

Introduction

 

This document provide information about DOM (Digiatal Optical monitoring)

 

Information

Digital Optical Monitoring or DOM is an industry wide standard, intended to define a digital interface to access real-time operating parameters such as:

 

Optical Tx power

Optcal Rx power

Laser bias current

Temparature

Transceiver supply voltage

 

Which means, we are now by using DOM capable of performing transceiver monitoring and troubleshooting operations.

 

DOM Support on Cisco Transeivers

 

Not all transceivers support DOM, a list of capable transceivers is available at:

 

DOM compability Matrix

 

How to use DOM

 

Following command can be used to turn on/off DOM for all transceivers type in the system

 

Router(config)#transceiver type all

Router(config-xcvr-type)#monitoring

Router(config-xcvr-type)#end

 

Once enabled, DOM can be accessed via CLI using "show interface transceiver command"

 

transceiver.jpg

 

Off all the five values two mostly used and rellevant values are TX and RX power, temperature is also used sometimes. The operating range of these three values is unique across all modules and is available in the data sheet.

 

There is an extension available for this command, which is also very helpful and is used to check threshold values of the above paramaeters like temperature , Tx, Rx. The command is , show interface gig x/y transceiver detail

 

sh int gi 1/3 transceiver detail

 

Transceiver monitoring is disabled for all interfaces.

ITU Channel not available (Wavelength not available),

Transceiver is externally calibrated.

mA: milliamperes, dBm: decibels (milliwatts), NA or N/A: not applicable.

++ : high alarm, +  : high warning, -  : low warning, -- : low alarm.

A2D readouts (if they differ), are reported in parentheses.

The threshold values are calibrated.

 

 

                            High Alarm  High Warn  Low Warn   Low Alarm

        Temperature         Threshold   Threshold  Threshold  Threshold

Port     (Celsius)          (Celsius)   (Celsius)  (Celsius)  (Celsius)

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

Gi1/3     34.2               110.0        93.0       -30.0      -40.0

 

 

                            High Alarm  High Warn  Low Warn   Low Alarm

         Voltage            Threshold   Threshold  Threshold  Threshold

Port     (Volts)            (Volts)     (Volts)    (Volts)    (Volts)

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

Gi1/3    3.31                  3.90        3.70        2.90       2.70

 

 

                            High Alarm  High Warn  Low Warn   Low Alarm

         Current            Threshold   Threshold  Threshold  Threshold

Port     (milliamperes)     (mA)        (mA)       (mA)       (mA)

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

Gi1/3      0.1         --     80.0        70.0         4.0        2.0

 

 

         Optical            High Alarm  High Warn  Low Warn   Low Alarm

         Transmit Power     Threshold   Threshold  Threshold  Threshold

Port     (dBm)              (dBm)       (dBm)      (dBm)      (dBm)

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

Gi1/3    -27.7         --      0.9        -1.0       -11.5      -13.5

 

 

         Optical            High Alarm  High Warn  Low Warn   Low Alarm

         Receive Power      Threshold   Threshold  Threshold  Threshold

Port     (dBm)              (dBm)       (dBm)      (dBm)      (dBm)

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

Gi1/3     -7.2                 0.7        -1.0       -20.0      -24.0

 
 
 

Related Information

Comments
Cisco Employee

v good explanation. but are these commands same across all platform/ios release?

like 7600/6500/iosxr/nexus ?

 

Router(config)#transceiver type all

Router(config-xcvr-type)#monitoring

Router(config-xcvr-type)#end

New Member

Thanks for these information, helped me alot trough understanding and configuring my DOM

New Member

the following command DOES not exist of 38xx or 3750 or 3560 devices

transceiver type all

what product support this command?

show int transceiver 

seems to only work on 3750/3650

but not on 38xx routers

New Member

Thank you for the information.  Great tip!

I can confirm these commands are working on 6880 devices.

Thanks again!

New Member

I can confirm that these commands work in the CGR2010.

Very useful to track fiber status.

New Member

We just installed some 4431's with DOM supported SFP's. Do the 4431's support DOM and how do I turn it on. I have tried the above commands and it does not work. Any ideas. I did find some documentation that shows DOM is supported but it looks like it might just be in the NIM's and not for the onboard SFP ports.

Thanks

New Member

The command to show the Optical Rx and Tx levels is:

show interface <int id> transceiver detail

it works on WS 3560 Switch but not on 4560 switch.

The command transceiver type all does not work on 4560 either, despite being shown in the manual.

Regards

John

New Member

show interrface e1/3 transceiver

This command works on NX-OS too. Tested on N5k/N7k

New Member

Jose Colon II

On the 4451X I was able to use the following command:

show hw-module subslot 0/0 transceiver 1 status
The Transceiver in slot 0 subslot 0 port 1 is enabled.
Module temperature = +22.878 C
Transceiver Tx supply voltage = 3346.3 mVolts
Transceiver Tx bias current = 13488 uAmps
Transceiver Tx power = -7.2 dBm
Transceiver Rx optical power = -7.8 dBm

Regards,

Lena

Cisco Employee

Hi,

Thanks for the above information.

And can you please suggest any workaround for those optical devices that do not support DOM.

I'm interested in obtaining only the Tx power and Rx power.

Regards

Joy

New Member

Hi!

Does the command "transceiver type all | monitoring" affect traffic on production system if I want to enable DOM on the switch?

Regards,

Anton

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