09-08-2010 05:25 PM - edited 03-06-2019 12:53 PM
I never heard of this but wanted to ask some experts. A security company spoke to the owner of our company today about implementing IP Cameras. These cameras would have their own switches in the wiring closets, but need a fiber connection back to our server room. He said that it is possible to split the fiber connection so the two seperate networks can share the fiber backbone.
Is this possible? Do they use different frequencies? If this is possible how does this affect bandwidth?
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09-08-2010 05:44 PM
It's called Coarse Wave Division Multiplex (CWDM) or Dense Wave (DWDM).
Cisco Dense Wavelength-Division Multiplexing Small Form-Factor Pluggable Module
Cisco CWDM GBIC and SFP Solution
Cisco Enhanced Wavelength Division Multiplexing Product Line
http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_data_sheet0900aecd806a1c36.html
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09-08-2010 06:43 PM
Thanks for the ratings.
DWDM/CWDM is like a two-edged sword. For a small fee (the procurement of the modules and the circulator) you can split/splice one physical fibre optic cable into multiple pairs. The downside is that once you loose your one-and-only fibre link (to a cable-hunting-buck-hoe) then you're in trouble.
09-08-2010 05:44 PM
It's called Coarse Wave Division Multiplex (CWDM) or Dense Wave (DWDM).
Cisco Dense Wavelength-Division Multiplexing Small Form-Factor Pluggable Module
Cisco CWDM GBIC and SFP Solution
Cisco Enhanced Wavelength Division Multiplexing Product Line
http://www.cisco.com/en/US/prod/collateral/modules/ps5455/product_data_sheet0900aecd806a1c36.html
Is this what you are looking for?
Please don't forget to rate our useful posts. Thanks.
09-08-2010 06:40 PM
Have you ever used this and if so what are the pros and cons? Both connections will get a full gigbit connection? Thanks for the links I'll read up some more.
09-08-2010 06:43 PM
Thanks for the ratings.
DWDM/CWDM is like a two-edged sword. For a small fee (the procurement of the modules and the circulator) you can split/splice one physical fibre optic cable into multiple pairs. The downside is that once you loose your one-and-only fibre link (to a cable-hunting-buck-hoe) then you're in trouble.
09-08-2010 07:06 PM
Sounds like really cool technology but perhaps over kill for what we need. We only need to about two 500 foot runs inside of a warehouse and office. Not sure why the guy suggested this technology, to me it sounds cheaper to run two new fiber lines for the security system. This equipment sounds pretty expensive. Is this mostly used for single mode fiber?
09-08-2010 07:30 PM
It's only long reach because the philosophy is it's cheaper to use DWDM/CWDM for long distance than putting a second pair of fibre in.
If it's short reach, then I'd recommend that you put MORE THAN what you need. I don't know if you are aware, when we are talking about the cost of laying down fibre (whether it's long or short reach) the cost of the fibre cable alone is constant but the labour cost is insidious. So in your case, for example, if you need only one more pair, then put a 3 pair or 6 pair fibre optic.
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