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Thread: Optics on 40 Mile Fiber Link
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10-05-2008, 01:11 PM #1New Member
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Optics on 40 Mile Fiber Link
We have just signed a lease on a new dark fiber link which is 45 miles. I had planned to connect this to an ExtremeNetworks Summit @ 10 Gig at either end.
The maximum distance rated optics I can find are 80km/50miles but have been told that these are based upon perfect fibre quality...
We can insert a repeater half way down the line if required. What options do I have in regards to amplifiers/repeaters? $/Manufactures advice please!?
Can we also increase the range through the use of DWDM? Presumably this is going to be fairly costly? Can anyone give me a rough idea of $ of this?
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10-05-2008, 02:44 PM #2Master of the Truth
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dwdm wont really increase your range unless the optics on the equipment will go farther and if you want to run multiple 10g waves. I'd try to see if the summit optics work.
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10-05-2008, 04:14 PM #3Junior Guru
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If you got a link report from the company that supplies the fiber, it should specify the link budget in dB. Just go for tranceivers that can handle that, and add a little just to be on the safe side. Also keep in mind the patch fibers etc.
The range specified is a "typical" range, but this depends on how many times the link has been spliced, if all the connectors along the way have been polished well enough etc. In a city there will be more "things in the way" than on the countryside.
Also keep in mind that for longer ranges, interface "auto" mode sometimes doesn't work, ad you'll have to set it to whatever link speed you want on each side, and make sure the connectors are swapped if needed.We do co-location and system management in Stockholm, Sweden. Unfortunately we cannot host you, but i'm sure you'll be ok.
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10-05-2008, 04:52 PM #4New Member
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Thanks for the info, hopefully the 80km ZR optics will be sufficient then. If they arent what options do we have for using repeaters/amplifiers?
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10-06-2008, 01:29 AM #5Web Hosting Master
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80km optics are pretty slim for this application. Honestly, you are better off with buying lit services from the provider. Once you get into multi-wavelength services over long distances, the equipment gets prohibitively expensive, thus, making buying lit services much more worth it.
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10-06-2008, 10:10 PM #6Web Hosting Guru
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There is a guy named Alex Pilosov that does this kind of stuff as part of his job.
He gave a presentation about it, see the PDF here:
http://www.nanog.org/meetings/nanog3.../4-pilosov.pdfreliable colocation ... Dedicated Servers | Dedicated Server VMs | FAST links to Vitelity.com and Conexiant.net
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10-07-2008, 05:05 PM #7Junior Guru Wannabe
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We use these babies. But you need a big checkbook. For 40 Miles without a repeater you're looking at six digits.
http://www.packetlight.com/admin/edi...Feb2008%20.pdf
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10-09-2008, 06:37 PM #8New Member
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Are you 100% sure that it's 45miles? I typically add 5% to the
distance to accomodate for urban/building and fiber routing.
Also, what about the fiber - just standard legacy SM fiber? You should try to find out what type of fiber it is, i.e. LEAF, TERALIGHT, DSF, SMF-28, as each has a different dispersion and core effective area. This will affect your distance and quality of connectivity/speed, which is what you were basically referring to in your original post.
With that said, a repeater isn't really going to help you here. I'd agree, and try to use a plug in transceiver option as that's definitely going to be the cheapest.
For DWDM, you could go to a cisco 15454-ONS (Cerent box) or use soemthing a bit more non-traditional, but works equally as good if not better like a xWDM product - Check out mrv.com, as they have some interesting options for this.
The 15454 options aren't that expensive for 1 port solutions as you can get these readily in several liquidators. And there are lots of WDM solutions out there - but I'd stick with something like MRV for cost/reliability.