Fiber optic connections

Answered Question
Sep 27th, 2009
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Hello,

I want to connect 4 x 3560 switches via Fiber on SFP ports, one to other. These switches are about 250 meters apart from each other. What kind of fiber cable, connectors and SFP module should I use?


Thanks

Correct Answer by Tom Randstrom about 7 years 9 months ago

SFP

GLC-SX-MM


Fiber

I would install an OM4 rated multimode fiber (MMF). This would enable the link to be upgrade to 10GE in the future. Type of cable jacket will depend on installation environment, whether indoor, outdoor, jacket fire rating, etc.


Connectors

SFP modules require LC type connectors. If the fiber is being terminated on a patch panel, you could use LCs on the panels as well or whatever your network is using now. Just select the appropriate connectors for the end of the jumpers.

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viyuan700 Sun, 09/27/2009 - 08:08
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For 250m 50Micron Multiimode Fiber(MMF) (MAx distance550m for this fiber)would be fine,if you dont expect any change in disatnce later.


GLC-SX-MM=

1000BASE-SX SFP transceiver module for MMF, 850-nm wavelength


You can use above card and can check when ordering what kind of connectors above card have.



Check this linkto see other cards available as you know your future palns


http://www.cisco.com/en/US/docs/routers/7200/install_and_upgrade/gbic_sfp_modules_install/5067g.html#wp34124

Correct Answer
Tom Randstrom Sun, 09/27/2009 - 08:09
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SFP

GLC-SX-MM


Fiber

I would install an OM4 rated multimode fiber (MMF). This would enable the link to be upgrade to 10GE in the future. Type of cable jacket will depend on installation environment, whether indoor, outdoor, jacket fire rating, etc.


Connectors

SFP modules require LC type connectors. If the fiber is being terminated on a patch panel, you could use LCs on the panels as well or whatever your network is using now. Just select the appropriate connectors for the end of the jumpers.

viyuan700 Sun, 09/27/2009 - 08:33
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Thanks Tom for a nice response!!,


Is OM4 a standard yet(since i dont have that info so just inquiring )?


Hi Huseyin Kayahan,

just check the price of OM3 & OM4 if it is too much differece then you have to decide which one you want to go with.


Well all this consideration will come only at higher speeds. OM3 have modal bandwidth of 2000 whereas for OM4 they talk about 4700.


But at 10G both OM3 & OM4 gives the same distance. As you need a diffrence kind of transmitter to take advantage of OM4 extra modal bandwidth.


Tom Randstrom Sun, 09/27/2009 - 08:40
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The OM4 standard was recently ratified.


I feel it is always important to install the best cabling you can afford.


You will definitely need to purchase a new transmitter when you migrate to 10Gbps speeds. It is easy to change the optics attached to the fiber but harder to change the fiber itself.


Thanx for your support of the forum!


husycisco Mon, 09/28/2009 - 10:56
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thanks for your valuable inputs guys. I may come up with new questions on fiber.

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