The difference between GLC-SX-MM and GLC-SX-MMD

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Cisco
Cisco Routers
The two modules seem to be similar,  What's the mean about "D", What's the  difference between GLC-SX-MM and GLC-SX-MMD?

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The difference between the two is the DOM functionality. DOM stands for Digital Optical Monitoring. Basically it’s a function that allows network administrator determine the send/receive power, temperature, winning lotto number.
And the GLC-SX-MMD is the replacement of GLC-SX-MM,as GLC-SX-MM is EOL.

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