Fibre Optic Cabling 1

[lbarron]

Hi,

We have two fibre optic cable runs terminating on seperate patch panels in the same cab. I would like to daisy chain them together via patch lead to re-direct some of the network traffic. The only problem is the fibres are different grades, one is 62.5/125 and the other is 50/125. Can this be done?

Thanks

Lee

 

[jimbopalmer]

http://www.alliedtelesyn.com/media/datasheets/cv1kss_ds.pdf

http://www.alliedtelesyn.com/media/datasheets/cv1000_ds.pdf

and 2

http://www.alliedtelesyn.com/media/datasheets/spsx_ds.pdf

would allow 220 meters on the 62.5nm side and 550 meters on the 50nm side.


I tried to remain child-like, all I acheived was childish.

 

[wires]

The only problem is the fibres are different grades, one is 62.5/125 and the other is 50/125. Can this be done?"

Yes. There will be more loss at the 65nm to 55nm junction but it should work if everything is in good shape and not already at loss limits. I would use a 62.5/125 patch cable with appropriate connectors on each end. Here is one place to custom patch cables: fiberopticcables.stores.yahoo.net/mmdup625.html

Give it a try. What do you have to loose, the cost of a patch cable?

If not I think there is a active converter made that has 62.5nm optics on one side and 55nm optics on the other if the simple patch cable option does not work. Or this device should do about the same thing:

http://www.bb-elec.com/bb-elec/literature/fostdrp.pdf

 

[wires]

Jimbopalmer - Could you tell us what information on the 3 pdf's you cited is relevant to the question posed by lbarron. I have looked at them several times and find nothing about 55nm and 65mn connectivity. Am I missing something?

The "would allow 220 meters on the 62.5nm side and 550 meters on the 50nm side" applies to gigabit speeds. 100 megabit will go up to 2km on 55nm or 62.5nm multimode.

 

[jimbopalmer]

AT-SPSX 1000SX, (LC) 850nm
220m (62.5/125)
500m (50/125) fiber"
This SPF will work with both 50 and 62.5nm fiber, I just need one each, the other two PDFs just provide the electronics and case/powersupply to run two SPFs.

I could not find a 100 meg solution from A-T, the OP does not hint what speed his network is.

Here is a possible 100baseFX converter from Transition - SFMFF1313-200

http://www.transition.com/Transitio...24710&CategoryName=F-SM-MM-02+&+SFMFF1x29-20x

Call me pessimistic, but I think regenerating the signal with electronics will work better than a line conditioning cable.
Transition also has gig converters

http://www.transition.com/Transitio...2&CategoryName=F-SM-MM-04(xx)+&+SFMFF1xxx-22x

If he is using 10baseFL, it will be even trickier.

I tried to remain child-like, all I acheived was childish.

 

[lbarron]

Thanks for all your posts guys, you've given me some options to look at.

We are currently running the 62.5nm link at 100Mbps I'm not sure of the length but it's a fair run so I don't think it would be OK at 1000Mbps.

From what I have read the 50/125nm grade of fibre has much less loss over distance so is better suited to the higher speeds?

Thanks

Lee

 

[mikeydidit]

The 50 mm core on multimode is better than the 62.5, but you should really look at using singlemode for long hauls. It has a lot less loss than any multimode, and will somewhat future proof your installation.

The cost of the fiber is minimal compared to the cost of installation.

http://www.luxlink.com/faq/multi_or_single.htm

-No. Wavelength Fiber Type Connector Transmission Distance covered**
-1 850 nm multimode ST up to 2 miles (3 Km)
-3 1310 nm multimode ST up to 6 miles (10 Km)
-7 1310 nm single-mode FCPC up to 20 miles (30 Km)
-8* 1310 nm single-mode ST up to 20 miles (30 Km)
-9 1550 nm single-mode FCPC up to 40 miles (60 Km)



"A people that values its privileges above its principles soon loses both."
- Dwight D. Eisenhower (1890-1969), Inaugural Address, January 20, 1953

For the best response to a question, read faq690-6594

 

[Dustinn3]

50 mm fibre is certified for 10G ethernet up to 550 meters depending on the quality. Unless you have a distance problem, IE your links are more than 1/3 a mile a way, single mode would probably be a waste of money. The optics are 5 to 10 times more expensive and will have to be replaced more frequently than the cable. Considering the fact that you're just going gigabit, I highly doubt you'll be going 100G anytime soon. Even the article says it might be cheaper to rip out existing singlemode and replace it with multimode. I've been running all my building to building links on 62.5 1000Mbps for about 8 years with no issues. It just depends on how far you have to go.