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

[Anonymous]

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

[ABBA-SYSTEMS]

--->>> 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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[Anonymous]

Thanks for the speedy reply!