Catalyst 2950 with 100 base FX fibre

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Mar 21st, 2007
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Hello, we have a WS-C2950 (old type) with 2 fixed 100Base FX fibre port. Now we want to connect the 2950 to a Catalyst 2960 via fibre. Is it possible to use this STP modul GLC-GE-100FX= in the 2960, to make the link to the old Catalyst 2950. The datasheet "said" that the wavelenght is 1310nm on the GLC-GE-100FX= modul. Normaly the wavelenght on 100base FX is 1300nm (as i know). Will this work well???

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konigl Fri, 03/23/2007 - 20:59
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This will work fine, as long as your Catalyst 2960 switch is not one of the 8-port compact models (which do not support the GLC-GE-100FX=). The 100Base-FX standard supports multimode fiber distances of up to 2km in full duplex mode.

The hardest part will be finding multimode fiber patch cables with the correct connector ends.

Your WS-C2950C-24 (old type) has 100Base-FX fiber ports with MT-RJ connectors.

The Catalyst 2960 switches use 100Base-FX SFPs with LC connectors.

The 1300nm wavelength is the targeted region of the optical spectrum. The optical transmitter on each port can transmit at anywhere from 1270 to 1380nm, and still work; but typically operates around 1300 to 1310nm.

The optical receiver on each port is sufficiently forgiving to allow the transmitters to vary 10's of nanometers from that ideal 1300-1310nm range, and still function reliably.

Cisco 100BASE-FX Small Form-Factor Pluggable Modules Installation Notes

Hope this helps.


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