Correct fiber for J4858C 1000BASE-SX SFP

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fractal

Active Member
Jun 7, 2016
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I never thought that I would have to ask what I would think is such a simple question, but what is the correct fiber for connecting a pair of HP J4858C SFP optics? I checked the HP web site and expected to see a definitive answer but from what I can tell they will work with any or all of the below:

10Gb LC/LC, Multi Mode, 50/125 type, Aqua
Fiber Optic Cable, LC/LC, OM2, Multi Mode, 50/125 type, orange
Fiber Optic Cable, LC/LC, OM1, Multi Mode, 62.5/125 type, orange

I check monoprice and they are all the same price

So, for those who know, will those SFPs work with any of the above, and if so, is there any reason NOT to get the more modern, Aqua cable? If not, what is recommended by people who have found where the gators live in those swamps?

For more detail, I have an HP 1800-24G in my office and a HP 2626PWR in my garage. They are currently connected with powerline network adapters which kinda work. I bought the 2626 cheap to run a couple of POE cameras as well as a couple of loud computers I wanted to get out of my office. It is 10/100 with two SFP uplinks that will run gigabit. I was going to pull cat5e from the office to the garage when I got the urge to pull fiber as well. I am still going to pull cat5e. I can run the cat5e at 100 mbit without any SFPs which is probably more than fast enough. Or, I can get a 1000T copper SFP module. But, I figured, what the heck. I found a couple of J4858's on eBay for ten bucks each and monoprice has the LC/LC cables for a buck a meter. I'll need about 25 meters so I figured a 30 meter cable would leave extra in the attic. I may, some day, eventually, get equipment that can run 10G.

Can anyone recommend which fiber I should buy? Or, should I save my self some work and only pull cat5e?
 

nickscott18

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Mar 15, 2013
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There are no reasons (that I'm aware of) to not go with OM3. While you're pulling the Cat5E, pulling fiber at the same time isn't much more effort, and gives you room to move to 10G in the future.

One tip though - leave a draw wire / string in the conduit for the future - saves a lot of hassle.
 

Jerry Renwick

Active Member
Aug 7, 2014
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I have the same opinion with nickscott18, why not use OM3? it is essential for future proofing. As 10G Ethernet is about to be ubiquitous in the near future.
If you want to purchase the most cost-effective multimode fiber, you can take a look at Fiberstore. My friends recommend it to me ! and I think it is good! ;)
 

Pete L.

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Nov 8, 2015
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Beantown, MA
Why not use OM4, its the newest "Standard" and it isn't that much more money. I'm also a big fan of Fiber Store. Anyway the 10G we will see in the house should be copper, it is out there it is just an insane price per port. The Copper version also uses more power than the SFP+ Based 10G. I would stick to OM3 or 4 50 micron. MM Fiber, with LC / LC Connections.

Then again a lot of people are saying we will probably see something else like 2.5gb or 5gb/sec in the house before 10? I don't really buy that but what do I know

Or like you mentioned save the trouble of running the fiber and pick up the Copper SFP Modules, I am going to guess that you can get them from Fiber Store for about$16 each but shipping which if you go slow version is very reasonable.

The Difference Between OM Multimode Fibers - OM1, OM2, OM3 & OM4