1000BaseSX to 100BaseFX
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Posted by Tom on December 3, 2004, 6:35 pm
Please log in for more thread options with 1000BaseSX uplinks were connected to, and functioning with, our 100baseFX switches. Also, from what I've been told and seen (from the brief time that I've been here) it has been working this way without errors, for some time now. My question is: how is this working if one side is gigabit and the other is 100 mbit? (please include gory details) Thanks | |||||||||||||||||||
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Posted by M.C. van den Bovenkamp on December 4, 2004, 4:15 am
Please log in for more thread options ??? Are you *very* sure about that? 100BaseFX & 1000BaseSX shouldn't even be able to see each other, much less talk to each other! And I do mean 'see' literally: 100BaseFX uses a wavelength of 1300 nm, and 1000BaseSX uses 850 nm. They shouldn't even detect each others' presence. On that front you'd have more luck with -LX, which also uses 1300 nm, but even then I have never heard of a 1000BaseLX PHY that does 100BaseFX as a fallback... Switch make & model? Module types? Inquiring minds want to know :-). Regards, Marco. | |||||||||||||||||||
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Posted by stephen on December 4, 2004, 2:39 pm
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> Tom wrote:
> > > I recently checked out one of our networks to find that our switches
> > with 1000BaseSX uplinks were connected to, and functioning with, our > > 100baseFX switches. Also, from what I've been told and seen (from the > > brief time that I've been here) it has been working this way without > > errors, for some time now. > > > > My question is: how is this working if one side is gigabit and the > > other is 100 mbit? (please include gory details) >
> ??? Are you *very* sure about that? 100BaseFX & 1000BaseSX shouldn't > even be able to see each other, much less talk to each other! > > And I do mean 'see' literally: 100BaseFX uses a wavelength of 1300 nm, > and 1000BaseSX uses 850 nm. They shouldn't even detect each others' > presence. I have heard rumours about GBICs with 100 base-FX fibre interfaces - maybe that is what is in the switch? >
--
> On that front you'd have more luck with -LX, which also uses 1300 nm, > but even then I have never heard of a 1000BaseLX PHY that does 100BaseFX > as a fallback... > > Switch make & model? Module types? Inquiring minds want to know :-). > > Regards, > > Marco. Regards Stephen Hope - return address needs fewer xxs | |||||||||||||||||||
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Posted by M.C. van den Bovenkamp on December 4, 2004, 4:02 pm
Please log in for more thread options stephen wrote:
> I have heard rumours about GBICs with 100 base-FX fibre interfaces - maybe
> that is what is in the switch? That would make sense. A quick Google throws up the Allied Telesyn AT-A45/SC as a 100BaseFX GBIC, so yes, they do exist. Didn't know that. Still, I'd like to know what his setup is :-) Regards, Marco. | |||||||||||||||||||
| Similar Threads | Posted |
| 1000BaseSX to 100BaseFX | December 3, 2004, 6:35 pm |
| 1000BaseSX and Single Mode Fibre | April 8, 2005, 12:15 pm |
> with 1000BaseSX uplinks were connected to, and functioning with, our
> 100baseFX switches. Also, from what I've been told and seen (from the
> brief time that I've been here) it has been working this way without
> errors, for some time now.
>
> My question is: how is this working if one side is gigabit and the
> other is 100 mbit? (please include gory details)