MA-SFP-10GB-LRM and OM1

[AndrewBe]

Hi Guys,

I'm trying to get a definitive answer on whether I need mode conditioning patch leads to get 10Gb through OM1 using the MA-SFP-10GB-LRM SFP+ module (I know, OM1, but it's all I have to work with).

The datasheet for the Cisco module specifies the need for mode conditioning cables, but the datasheet for the Meraki module (https://meraki.cisco.com/lib/pdf/meraki_datasheet_sfp.pdf) doesn't, despite listing it as a requirement elsewhere (the MA-SFP-1GB-LX10, for example).

Thanks.

[jdsilva · Accepted solution]

Nope. LRM modules are designed to work over multi-mode fibre. You need mode conditioning cables when you're using LX/LR type transceivers over MM. 

https://en.wikipedia.org/wiki/10_Gigabit_Ethernet#10GBASE-LRM

**Edit**

Oops, it looks like I'm mistaken. I've only ever used 10G LRMs over OM3/4 so I was assuming it was the same for all MM. I'm seeing that you do need mode conditioning cables for OM1 with LRM. Seeing as how the Meraki SFP's are the same hardware as the Cisco SFPs, just with different part numbers, I would go with the Cisco docs. Meraki appears to have left that out of theirs. 

[BrechtSchamp]

+1

[AndrewBe]

Thanks, appreciate your quick response.

[BlakeRichardson]

Datasheet shows OM1 is supported but now idea about patches leads.I would however suggest that the fibre link be upgraded to at least OM3 preferably OM4. While its important to keep hardware modern infrastructure cabling is often overlooked.