GLC-SX-MMD to Single Mode Backbone

[mohdalhafiz85]

Hi Cisco

May i have your advise regarding about the GLC-SX-MMD. We have SINGLE MODE FIBER BACKBONE but we was buy this spf module GLC-SX-MMD which is its working for Multimode FIber cable

Is it possible if I use Multimode Fiber patch cord for GLC-SX-MMD to connect our SINGLE MODE FIBER BACKBONE? Can it be work? I have read some article below

http://www.lanshack.com/ModeConditioning.aspx

SM Backbone > MM Patch Cord > GLC-SX-MMD > Cisco Switch 

[Marvin Rhoads]

No, you cannot do that.

Mode conditioning patch cables are designed to allow you to convey coherent (laser) signals from a singlemode transceiver across a multimode cable plant, subject to certain limitations.

You are asking about the opposite use case - transmitting non-coherent (LED) signalling across a singlemode cable plant. The optical characteristics of the multimode light will not permit you to do this with any sort of effective operational reliability.

More details here: http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/product_bulletin_c25-530836.html

[mohdalhafiz85]

Hi Marvin

Thank you for your feedback. To make it work with Single mode fiber backbone that it means i need to change my GLC-SX-MMD to SIngle mode SFP?

or other option

I need to change my Single Mode Fiber backbone from Single mode to Multimode backbone if need to reamin use GLC-SX-MMD (Multimode SFP). Am I right?

[Marvin Rhoads]

Correct.

The GLC-LH-SMD would be the most commonly used transceiver for your use case.

[fiberstorejames]

I agree with Marvin, you'd better buy a Cisco single-mode SFP, which will save all your problem.

Good luck