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Engineering Fields - Control Engineering - New Member

Join Date: Oct 2007
Location: Emeryville, CA
Posts: 16

Fiber Optics - Testing the Waters

03/05/2008 4:11 PM

Hi all

I work for a building automation contractor and we've decided to look into fiber, as some of our Cat 5 runs exceed 300 ft. Another driver for this decision is that we will be implementing BACnet soon. From what I've read, it looks like multi-mode graded index fiber is both cost-effective and offers good performance.

The best signal source option seems to be LEDs as opposed to laser diodes, and the signal detector would be a PIN photodiode.

I'm not clear at all on what type of connectors are most suitable and what equipment I need to terminate them.

We are going to purchase some equipment and bench test it before sendng it out to our field techs. Am I missing anything obvious?

Any words of wisdom?

As you can imagine a net search gives me about 3B hits. I'd like to narrow it down just a bit.

John

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Anonymous Poster
#1

Re: Fiber Optics - Testing the Waters

03/06/2008 3:56 AM

Fiber is great but you probably want to use tight Buffered for your applications in buildings and make sure you buy the plenum rated cable to meet the code requirements in multi level buildings.

Buy quality connnectors- I can not stress this enough, and we have much higher reliability with glued and polished than crimp connectors. ( others may have other opitions) The style of connector can be driven by the equipment you connect to, so the patching is easy. Fiber is cheep -make sure you install enough fibers and terminate them all at the panels, so you have easy expansion or additional runs without having to send a terminator out again later.

Use standard colour codes for layout of the FO conductors - you will be amazed how simple that will keep life in drawings etc.

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