Difference between Multimode Fiber Optics

[ramkunta]

Hi there,

I was wondering what is the difference between GLC-SX-MM and GLC-SX-MMD.

Cisco website says that MMD is with DOM, kindly help me understand what it is.

Thanks,

Ram

[Joseph W. Doherty]

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Posting

A question probably better asked in the Optical Networking forum, but suspect the DOM version will provide optical stats (e.g. like received strength of optical signal).

[Leo Laohoo · Accepted solution]

The difference between the two is the DOM functionality.  DOM stands for Digital Optical Monitoring.  Basically it's a function that allows network adminstrator determine the send/receive power, temperature, winning lotto number.

DOM is very, very helpful and I wouldn't purchase anything without one.

[nkarthikeyan · Accepted solution]

Hi Ram,

Digital diagnostics monitoring

Modern optical SFP transceivers support digital diagnostics monitoring (DDM) functions according to the industry-standard SFF-8472.  This feature is also known as digital optical monitoring (DOM). This  feature gives the end user the ability to monitor real-time parameters  of the SFP, such as optical output power, optical input power,  temperature, laser bias current, and transceiver supply voltage.

Nothing as far as i see it has some added advantage of digital diaganostics than the legacy model.

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By

Karthik