Compatibility of GLC-SX-MM with GLC-SX-MMD.

[dipankarmukherjee28]

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.

[Leo Laohoo · Accepted solution]

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.

[Marvin Rhoads]

+1 what Leo said.

I've used "D" and "non-D" transceivers together just fine.

[Leo Laohoo]

Thanks for the VIP Endorsement, Marvin.

[dipankarmukherjee28]

Hi All,

Thanks for your crarification.

Just a small query,  If I connect one  switch having GLC-SX-MMD module with existing switch having GBIC_SX module will it work?

[Leo Laohoo]

Just a small query,  If I connect one  switch having GLC-SX-MMD module with existing switch having GBIC_SX module will it work?

Same answer as before:  As long as you are using the correct patch cable (MM) and your backbone is also MM, then yes.  The GLC-SX-MMD and G5484 GBIC are compatible.

[lerner cisco]

All ,

I have one more question on the GBIC-SX  cards  ,  these cards currenlt connected to switch  WS-C2950G-48-EI

planning to upgrade switch to  WS-C2960S-48LPS-L  with GLC-SX-MMD , however customer like to use same cable which are connected to  old switch GBIX_SX card   at new switch GLC-SX-MMD cards , would like to know is this works

Regards

Lerner

[Sam Pragash]

Hi

Does Cisco Firepower 2130 support GLC-SX-MM? In the Cisco document, only GLC-SX-MMD= is given. But if i connect GLC-SX-MM will it work?

https://www.cisco.com/c/en/us/td/docs/security/firepower/2100/hw/guide/b_install_guide_2100/overview.html#concept_96D56F5D3ADB4FA0B3EA301D3445D629

[Marvin Rhoads]

I suspect they are not listed as compatible because the GLC-SX-MM end of sales date was four years ago - well prior to the introduction of the Firepower 2100 series in early 2017.

https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/eol_c51-698060.html

Cisco doesn't test every transceiver ever sold with every new product. From what I have seen they draw the line with testing older discontinued products on new platforms.

If you have some old GLC-SX-MM transceivers on hand you can try one and see if it works. I wouldn't count on that as "plan A" though.

[Sam Pragash]

Thanks for your revert.

[Jonnathan London]

The compatibility of GLC-SX-MM with GLC-SX-MMD depends not on whether one supports DOM and the other doesn't, but depends on the consistency of your patch cable and backbone(both MM for example).