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Not sure if this is relevant to ask here ... but I cannot find any information on the net about it.

But here goes:

Today I have a fiber that comes into building B from A(I have no control here. Lets just say it's our ISP). This goes to a switch Cisco 2960G with a CWDM SFP Fiber module. Then from a Ethernet port to a Firewall.

This all works ... no problem.

In the near future another building will be connected with a Single Mode Fiber cable to building B. Lets call this C. ( We have no equipment in building C )

Since SFP CWDM Fiber modules is expensive(Compared to NON-CWDM ... in denmark, it's a factor 12) ... what would the best option be? ( I can see there is non-original CWVM, but these prices here is only compared to original )

Is "Ethernet to Fiber media converters" reliable? I don't see many of them and most of them are from rather unknown vendors?

I'm looking for an affordable solution ... so any vendor/products is most welcome.

Or is an additional switch to convert the RJ45/Ethernet from the switch in building B something that is beign used?

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Define 'expensive'. – Iain Jun 28 '14 at 15:45
Updated the question. I guess i'm also looking for good advise here. – Syska Jun 28 '14 at 15:51

I had very good experience with Allied Telesis. Have been using them since the late 90s and never had a problem with them. Currently I am using them in a rack mounted case with dual power supply, so you're even protected against power supply failure.

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+1 - I've used quite a number of Allied Telesis 10/100/1000 media converters (including both the long-haul and short-haul gigabit varieties) over the last 15 years and had good success with them. I've used them standalone with their wall warts, but their rack mount chassis is nice, too. – Evan Anderson Jun 28 '14 at 15:58

You're looking for a media converter. Black Box, StarTech, and Allied Telesis all make models in the $100-$200 USD range that would suit your needs.

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In my experience a small switch with an SFP port (or several) is often cheaper or no more expensive than a media converter, and more likely to be made by a known/reliable vendor (and thus tends to be be more reliable than a "media convertor.")

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