Question about Cisco GLC-SX-MM= 4 in 1 GE SFP, LC connector SX transceiver (GLCSXMM4IN1) Transceiver

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Question about the compatibility of GLC-SX-MM with GLC-SX-MMD.

Hi ALL, My query to all of you is that if I connect a GLC-SX-MM at one end and GLC-SX-MMD at the other end, will the link come up. The difference between the modules is that one supports Digital Optical Monitoring and other does not.

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According to Cisco Compatibility Matrix, GLC-SX-MM and GLC-SX-MMD transceivers are the 1000BASE-SX SFP transceiver modules for MMF with dual LC/PC connector. The only difference is that GLC-SX-MMD has additional function of DOM support, which may not affect the compatibility.

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As long as you are using the correct patch cable (MM) and your backbone is also MM, then yes. The GLC-SX-MMD and GLC-SX-MM are compatible.

Posted on Apr 24, 2015


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What is the difference between GLC-LH-SM and GLC-LH-SMD?

They are 1000BASE-LX/LH SFP for Both Multimode and Single-Mode Fibers, compatible with the IEEE 802.3z 1000BASE-LX standard, operates on standard single-mode fiber-optic link spans of up to 10 km and up to 550 m on any multimode fibers.

If one switch supports Cisco SFP GLC-LH-SM, then it can also support Cisco SFP GLC-LH-SMD.

The difference between GLC-LH-SM and SFP GLC-LH-SMD is the letter "D".

What does "D" mean?
"D" of GLC-LH-SMD transceiver has additional support for Digital Optical Monitoring (DOM) capability.

What is 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.

The comparison between GLC-LH-SMD and GLC-LH-SM.

Related Source:
GLC LH SMD Overview
GLC LH SM LC Overview

Aug 18, 2017 | The Computers & Internet

1 Answer

GLC-SX-MMD and GLC-SX-MM, are they compatible with each other?

Yes, the GLC-SX-MMD and GLC-SX-MM are compatible with each other, and the difference between the two is that the GLC-SX-MMD transceiver has additional support for Digital Optical Monitoring (DOM) capability. For more tech support, you can consult with our CCIE expert - Bill, and his e-mail address is as below: GLC SX MMD Price Cisco SFP Modules GLC SX MMD 3Anetwork com

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Thanks for contacting FixYa. I was reviewing some of the older un-answered questions trying to ensure your issue has been resolved.

You should be able to resolve this issure by just removing the top end. You will have to remove the tank, the pipe, disconnect the carb, any water hoses, and possibly the radiator. If there is no damage to the connecting rod you be able to thoroughly clean the crankcase withough removing the engine. If you have damage to the top rod end you will have to pull the engine and split the case to replace the connecting rod.


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We are terminating a 24 OFC in a Cisco 2950 g switch using GLC-LH-SM transceiver,Physical connectivity everything correct for both end.Same We checked & Confirmed with Media Converter, Link cames Up,...

Dear,I work for Ingellen Communication Equipment and we are a large fiber optic products manufacturer in Shenzhen.Kindly let me know your specific requirements so that i can help.
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Where can i find a microsoft 2.4ghz transceiver

The BlueOptics and BlueLAN brands include the following products: Optical Transceivers, Active Optical Cable and Direct Attach Twinax Cable Solutions, MPO / MTP Solutions, SAS Solutions, Stacking Cables, Twisted Pair and Fiber Optic Patch Cords, PLC Splitters, Multiplexers, Demultiplexers, as well as other data center and cloud solutions.

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Where do I order a replacement transceiver
Please visit this site......... is a manufacturer of optical transceivers.
We produce any module compatible to all brands, suitable for all systems. SFP, XFP, SFP+, X2, Xenpack, QSFP or GBIC - as Ethernet, Fibre Channel, CWDM or DWDM with or without DOM/DDM.

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Cisco disables the trans port as default, have you enabled it in the system?

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