SFP connectors, Fibre and Switches.

HI All.

Our client wants us to connect 3 switches with fibre.

At the moment the switch from the server room (Which has 5 servers in it) is connecting to the main switch in another room (30 meters away) with a single cat5 cable.

The other switch is similar in that it has 20 odd clients connecting to a single cat5 back to the main switch.

Their switches have 4 x SFP connectors so we wanted to connect these switches together with fibre.

My question(s) are as follows:

We can purchase an SFP to Fibre converter module but looking at the spec these are rated at 100Mbs
IS THAT CORRECT - 100Mbps - are we talking 10x's slower than a 1gb network port on the same switch - or am I getting well mixed up here?

Can we simply purchase 30 odd metres of fibre and plug it straight into the SFP converter module.

Finally - is a single fibre connection a two way connection or do you need two - one for each way - i.e. upstream and downstream.

I make no apologies for the basicness and naivety of these questions - this is new to us.

Thank you and Regards
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What kind of switches are these?  Most fibre transceivers are rated for at least 1Gbps.


It is a simple process, you get your sfp transceivers and matching Fibre type cables.  You may have to do some configuration on the switches (depending on make and model).

As for your question, in relation to this topic, a single fibre connection is a two way connection.


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AndyKeenAuthor Commented:
Hi It Saige

Thanks for the help and info.

All the switches are Netgear with 1gb ports - my confusion is not with the switches (but perhaps it is) but with the SFP modules - so for example - this from Ebuyer -

StarTech.com Cisco Compatible 100 Mbps Fiber SFP Transceiver Module MM LC w/ DDM - 2km (Mini-GBIC) - 1310nm 100Base-FX Multi Mode SFP LC

doesn't that tell me its 100 Mbps ?

And thank you for confirming that a single fibre is a two way connection.

Any guidance on those SFP adapters would be great.
Correct, that is a 100Mbps Fibre Transceiver.  But if you have Gigabit switches it makes no sense to limit your backbone.

Could you provide the models for the netgear switches?  This way we can determine the correct module you would need to purchase.

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You just need to purchase the correct SFP for what you want, which is 1 Gb. Also-- very critical for good performance-- make sure that the SFP matches the fiber you are using- either multi mode or single mode. SFPs are built for one or the other, because the fiber core is a different diameter.
AndyKeenAuthor Commented:
Hi Mikebernhardt

Thanks for the help.

Could you please explain what is single and multi-mode fibre please.

it Sage - Thank you - upon further investigation I can see that there are 1gb SFP adapters - I appreciate you pointing me in the right direction
AndyKeenAuthor Commented:
Excellent answers - very helpful.
Adams PiterCommented:

There's a Chinese store that I like, fiberstore.com.

They specialize in SFP optical transceivers.
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