Digital Optical Monitoring

Overview

Digital Optical Monitoring (DOM) is a feature that allows for the real-time monitoring of various physical and operational parameters of fiber optic transceivers, such as transmit power, receive power, temperature, laser bias current, and voltage.

Requirements and limitations

DOM is supported on MS120, MS125, MS130, MS210, MS225, MS250, MS350, MS355, MS410, MS425, and MS450. Switches must be running MS17 or higher.
Cisco Meraki uses Small Form Factor (SFF) Specifications open standards however only the accuracy of Cisco Meraki SFPs are guaranteed. See more about our accessory policy here.
DOM is currently not supported on QSFP transceivers.

How to use

To monitor DOM metrics within the Switch page’s Ports tab, follow these steps:

In the left-hand navigation menu, go to the ‘Switching’ section.
Select ‘Switches’ to view the list of switches on the network.
Select a switch to access its specific page.
Click on the ‘Ports’ tab located in the top panel.
Click on an operational SFP fiber optic port on the Switch visual panel at the top.
Scroll down to the ‘Status’ section below, you will find the DOM metrics displayed, along with alerts.

For viewing historical data in charts form for each metric:

Use the drop-down selector to choose the parameter(s) you wish to analyze.
Select the parameter(s) to generate the data chart.
Move your cursor over the chart to see a tooltip for each data point that contains median, max, and min values for that specific day. It also contains the threshold values provided by the SFP module.

Tip: To adjust the time frame of the charts in the DOM section, select the time range option located next to the ‘Historical Data” section.

Configuration

DOM is enabled automatically once the switch has been upgraded to MS17. DOM cannot be disabled. Readings and thresholds are collected and populated in the dashboard once an optical transceiver is connected to the MS switch. The dashboard periodically polls for SFP telemetry every 5 minutes.

Thresholds

There are four threshold levels for each monitored attribute (transmit power, receive power, temperature, voltage, and laser current bias). Those threshold levels are:

Threshold	Severity Level	Description
High Alarm	Critical	Indicates that the attribute reading is above the maximum threshold.
High Warning	Warning	Indicates that the attribute reading is above the normal threshold but below the maximum threshold.
Low Alarm	Critical	Indicates that the attribute reading is below the minimum threshold.
Low Warning	Warning	Indicates that the attribute reading is below the normal threshold but above the minimum threshold.

API

DOM readings and thresholds can be accessed via the API by using the endpoint /organizations/organizationID/switch/ports/transceivers/readings/history/bySwitch