| Author |
Message |
Tom
Guest
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 Posted:
Sat Dec 04, 2004 4:35 am Post subject:
1000BaseSX to 100BaseFX |
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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)
Thanks |
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M.C. van den Bovenkamp
Guest
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| Posted:
Sat Dec 04, 2004 5:15 am Post subject:
Re: 1000BaseSX to 100BaseFX |
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Tom wrote:
| Quote: | 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.
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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stephen
Guest
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| Posted:
Sat Dec 04, 2004 4:39 pm Post subject:
Re: 1000BaseSX to 100BaseFX |
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"M.C. van den Bovenkamp" <marco@linuxgoeroe.dhs.org> wrote in message
news:41b101ae$0$73696$e4fe514c@dreader19.news.xs4all.nl...
| Quote: | 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?
| Quote: |
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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M.C. van den Bovenkamp
Guest
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| Posted:
Sat Dec 04, 2004 5:02 pm Post subject:
Re: 1000BaseSX to 100BaseFX |
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stephen wrote:
| Quote: | I have heard rumours about GBICs with 100 base-FX fibre interfaces - maybe
that is what is in the switch?
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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. |
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