Cisco SFP-10G-SR module fiber length question

[tevlinj]

Hello everyone,

This is my first post on the support forum.  Thank you in advance for any input you may have.

I would like some clarification on fiber lengths when using a SFP-10G-SR module.  The link below indicates it supports a link length of 26m on standard Fiber Distributed Data Interface (FDDI)-grade Multimode Fiber (MMF).  My question is, can I use a shorter length fiber jumper without risking burning up the optic?  Would I need to attenuate the light levels or should I stick with a 26m jumper?  Thanks again for your input.

https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html

[chrihussey]

Yes you can certainly use a shorter jumper. The spec is the maximum distance.

Hope this helps

[tevlinj]

Thank you for the comments, much appreciated.

[Joseph W. Doherty]

As Chris notes, you can go (much) shorter.

"As per IEEE specifications, minimum cabling distance for -LR, -SR, -SX, -LX modules is 2m "
From: https://www.arista.com/assets/data/pdf/Datasheets/Transceiver-Data-Sheet.pdf

[tevlinj]

Thank you for sharing the link, appreciate it.