Is possible to split a fiber conneciton between two seperate networks

Answered Question

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?

I have this problem too.
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Correct Answer by Leo Laohoo about 6 years 2 months ago

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.

Correct Answer by Leo Laohoo about 6 years 2 months ago

It's called Coarse Wave Division Multiplex (CWDM) or Dense Wave (DWDM).

Cisco Dense Wavelength-Division Multiplexing Small Form-Factor Pluggable Module

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6576/product_data_sheet0900aecd80582763.html

Cisco CWDM GBIC and SFP Solution

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6575/product_data_sheet09186a00801a557c_ps4999_Products_Data_Sheet.html

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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Correct Answer
Leo Laohoo Wed, 09/08/2010 - 17:44

It's called Coarse Wave Division Multiplex (CWDM) or Dense Wave (DWDM).

Cisco Dense Wavelength-Division Multiplexing Small Form-Factor Pluggable Module

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6576/product_data_sheet0900aecd80582763.html

Cisco CWDM GBIC and SFP Solution

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6575/product_data_sheet09186a00801a557c_ps4999_Products_Data_Sheet.html

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.

Correct Answer
Leo Laohoo Wed, 09/08/2010 - 18:43

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.

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?

Leo Laohoo Wed, 09/08/2010 - 19:30

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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