Mode conditioning cables for MMF.

Hi,
I have a building on campus, which is connected to my core switch over obsolete MMF (the link is approx 500m, but I can't indentify what type of fibre cable it is). Recently I upgraded core switch from 4006 to the new 4506E. In the 4006 I used GBIC SX modules on both ends, but after the upgrade I can't use those anymore.It seems that I need SFP LX/LH (cisco part GLC-LH-SM) on the core side and GBIC LX/LH (cisco part WS-G5486) in the access switch. Could you advice if I need mode conditioning cables to make it work? I figured that for my set up I'd need 1x LC to ST (core to patch panel) and 1 ST to SC (patch panel to switch). Help please...
thanks,
forman

I have question regarding your network.
1) Are you planning on using the installed “obsolete MMF” that you were using with the 4006 switch or is there some other fiber you will be using (what type)?
If you are using the original “obsolete” MMF, then you should be able to install a GLC-SX-MM SFP in the 4506E and connect to the original SX GBIC in the access switch.
If you will be using the original "obsolete" MMF with the 1000Base-LX/LH transceivers, then you will need a mode conditioning patch cord (MCPC) at each end. These cables are available from many suppliers. Below is a link to a vendor that sells MCPCs that have the ST connectors you need
LC to ST Mode Conditioning Patch Cords for 62.5 micron fiber
http://www.fiberinstrumentsales.com/products/fiber-optic-assemblies,-cable,-and-connection-accessories_multimode-lc-st-mode-conditioning-patch-cords.html
SC to ST Mode Conditioning Patch Cords for 62.5 micron fiber
http://www.fiberinstrumentsales.com/products/fiber-optic-assemblies,-cable,-and-connection-accessories_multimode-sc-st-mode-conditioning-patch-cords.html
Hope this helps!
Tom

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SFP/mode conditioning

I have some Catalyst 3560 switches that I need to connect over a long distance. The existing backbone is 62.5 850nm multimode and unfortunately I dont have the option of installing single mode fiber at this point. The distances range from 2000' to 6000'.
My question is - is this possible? and what parts would I need to make this work at 1GB/s?
I'm looking into the possibility of using a mode conditioning cable on both ends and a single mode SFP adapter for the switches. However, all I can find on the mode conditioning cables reference 1300nm and our existing fiber is 850nm. Is this a limitation of the existing fiber? Are there mode conditioning cables that support 850nm or does the SFP dictate what wavelength we are using?
Thanks in advance!

Take a look at the following Cisco document on operating 1GE over 62.5um MMF up to 2km....
Cisco Support for Gigabit Ethernet Deployments with Multimode Fiber Links up to 2 km
<http://www.cisco.com/en/US/prod/collateral/modules/ps5455/prod_bulletin0900aecd80425a37.html>
Depending upon your equipment, the GLC-LH-SM will probably be the SFP for your equipment. You can look at the following compatibility document...
Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix
<http://www.cisco.com/en/US/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6981.html>
I hope this helps.
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Long Haul Mode-Conditioning MultiMode GBICs?

We have a fairly large legacy installation of Catalyst 3500s interconnected with 62.5 MMF. Most of the links more than 200m or so have these old Allied Telesyn EX-1002 "range extenders" which are alleged to be able to run up to 2km over MMF without the use of mode conditioning cables. And they do seem to be work as stated, we hve a couple runs just shy of 1km and they have been staying up.
The EX-1002s are starting to die off and I can't find a similar product. Actually, I can't find any technical information at all on the EX-1002, they say "1000-baseX" and seem to be longwave. Since they are said to operate at 2km, is mode conditioning built-in to the device?
The only other way around this is to use generic LX/LH GBICs and mode conditioning cables, which are very expensive. Or maybe just buy some EX-1002s on Ebay?
But, is there a GBIC available that is Catalyst 3500 compatible that can do long-haul multimode gigabit?
Thanks,
-Wiley Sanders
St Marys College of CA

At the risk of bumping this topic too late, thanks for all the replies.
We have got everything working, but have not yet bought any mode conditioning cables. It seems to be cheaper for me to fiddle around with randomly swapping GBICs and patch cables, than systematically installing mode conditioning cables on all our links. :-(
A few observations:
- We have 1 or 2 links in the 300 - 400m range operating consistently on 62.5μ MMF with an LX GBIC on one end an an Allied EX-1002 "1000baseSX to 1000baseX" converter on the other (the "1000baseX" is long-wave. don't know if it's 1300 or 1310nm.)
- We have several links in the 300 - 500m range operating consistently on 62.5μ MMF with Allied "range extenders" at each end. We will replace these with LX GBICs and mode conditioning cables as the Allied devices die off.
- We have quite a few SX links operating in the 200 - 300m range, 1000baseSX to 1000baseSX. Occasionally we have had problems getting these to link up with a GBIC on one or both ends. As you would expect from the technical description of mode dispersion this is hit--and-missand randomly dependent on combinations of GBIC and patch cable. SFP-based SX links seem to link up more reliably at distances over 200m. (Perhaps because the tolerances are more precise and/or the SFPs are new and not old GBIC that have been sitting in some network admin's desk for 5 years.)
-w

SFP and Mode Conditioning Patch Cable

Is it safe to assume any SFP designed for single mode fiber (i.e., MGBLH1) can work with multi-mode fiber if using a mode conditioning patch cable?

It should work. The "mode conditioner" adds a loss in your optical link, typically 2 db.
If you want be sure you must do a link budget.
Regards.

X2-10GB-LX4 Mode Conditioning Patch or Not 62.5micron Fiber

I keep reading different things across the web. We are swapping out our SUP 720's with the newer VSS Sup 720's for the VSS technology. During the process we are going to start bringing 10Gb in. We have an existing FDDI (62.5 Micron MM) fiber plant. We purchased these with the X2-10GB-LX4 fiber modules designed to do 300m over 62.5 Micron fiber... Do we need a mode conditioning patch cord on each end? It would seem Cisco says yes or use the GBIC over single mode? I thought this was a multi-mode X2 module... I'm quite confused!!!

If you use the X2-10GB-LX4 transciever with 62.5 micron MMF, you need a Mode Conditioning Patchcord (MCP), part number CAB-GELX-625= or similar, on each end.
The -LX4 module it designed for MMF. In order to get a 10G signal through 300m of multimode fiber (which was originally designed for short, low bit rate paths) the LX4 module engineers used 4 coupled laser transmitters to send the information through the fiber. The Mode Conditioning Patchcords focus this laser light into the optimum section of the multimode fiber's core, so that it can reach the distant receiver and be successfully decoded.
This module, without the use of the MCPs, can be used on singlemode fiber (SMF). But, this module is more expensive that a standard SMF transceiver (LR or LRM) due to its use of 4 lasers and the WDM multiplexing integrated into the transceivers.
Does this help at all?
Tom

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Message was edited by: zstevek
Message was edited by: zstevek
Message was edited by: zstevek

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Message was edited by:
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Mode conditioning cables for MMF.

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