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Contributor
Posts: 53
Registered: ‎06-24-2009

question on cable length of SFP+ at 4Gb with 50u cable

Hello,

On our DCX switches with 8Gb SFP+ transceivers, sfpshow indicates max cable length of 20m with 62.5u cables (OM1/M6) and 50m with 50u cables (OM2/M5). On 4100/4900 switches with 4Gb SFPs, sfpshow indicates max length of 70m with 62.5u and 150m with 50u cables.

This is all in agreement with the Brocade document "Cabling_Best_Practices_GA-BP-036-02.pdf".

My question is what is the max cable length supported with 8Gb SFP+ transceivers when the port speed is set to 4Gb with a 50u (OM1/M6) cable? Does it behave like a 4Gb SFP and allow a max cable length of 150m? I presume it does but would appreciate confirmation from the experts.

Thanks,

Alastair

Super Contributor
Posts: 644
Registered: ‎03-01-2007

Re: question on cable length of SFP+ at 4Gb with 50u cable

--->>> Does it behave like a 4Gb SFP and allow a max cable length of 150m?

Yes. See table below.

Meters

1Gb

2Gb

4Gb

8Gb

10Gb

SM

10km

10km

10km

10km

10km

OM3

500m

300m

380m

135m

300m

OM2 50.0

500m

300m

150m

50m

82m

OM1 62.5

300m

150m

70m

21m

33m


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Thank You.

Contributor
Posts: 53
Registered: ‎06-24-2009

Re: question on cable length of SFP+ at 4Gb with 50u cable

Thanks for the speedy reply!

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