Fibre optic termination

[njanalla]

I want to connect 3 nos of HP 1920(4SFP model) switches to hp 2530(4SFP model) by single mode fibre optic cable. How many 1G optic transceiver I needed? Which are the materials I needed to terminate fibre cable to transceiver? Also the quantity of the same? Please help me…

 

[grana92]

Single mode cable is used for distribution. You should go with multi mode (50/125) but only if the distance between the "main" and the "secondary" switches will be less than 500 meters (I'm talking about the cable length).

You'll need 6 SFP modules that convert optical signal to electrical.
Your optic cables need to have LC duplex connectors on both sides.

 

[bill001g]

To add to the above post. If the distance is short where you can use premade patch cables it will save you money to use multimode optics and fiber. If you are talking long distances where you can not use premade patch cables then you need to hire someone to do this. Terminating fiber takes some practice to do correctly but the larger problem is the cost of the equipment to cut and polish fiber ends and then test the fiber.

Unless you are going to be doing a lot of fiber termination it tends to be cheaper to just pay someone to do it for you.

 

[grana92]

I work with optical fiber al the above post is 300% correct. The equipment is EXPENSIVE AS HELL

 

[njanalla]

What about quantity of pigtails?

 

[grana92]

you need two for each fiber. So if you need 3 links, that's 6 SFP modules and 12 pigtails every link need to fibers (Tx and Rx). Make sure that pigtails are 50/125 LC (LC connectors are usually for 9/125 (single mode) so pay special attention on that).

 

[grana92]

Oh and one more thing. Since optical fiber is so fragile and can easily be damaged it is highly recommended that you install a few extra links. Usually I like to have a backup for every optical link. You never know when will a clumsy worker accidentally wave his d**k around and cut the fiber...

 

[giantbucket]

you need two for each fiber. So if you need 3 links, that's 6 SFP modules and 12 pigtails every link need to fibers (Tx and Rx). Make sure that pigtails are 50/125 LC (LC connectors are usually for 9/125 (single mode) so pay special attention on that).

pigtails? as in half of a cable? is he gonna be splicing them on his kitchen table?

3 links = 6 modules = 6 cables (if they're not duplexed already)

and if you're going LC, don't get the white 900um cable (0.9mm), get the thicker 2mm that's usually yellow and has kevlar strands inside for better duarbility. the 900um LC is fine in a lab or inside of other equipment, but not exposed.

 

[giantbucket]

depending on the SFP transceiver module, you can use multimode or you might have to use singlemode. the transmit is usually not the issue, it's the receive side. a singlemode spits out light from a 9um core which results in a smaller "spot" (think flashlight), whereas multimode spits out from a 50um core or 62.5um core which gives a rather large spot (think floodlight), most of which can entirely miss the receiver's sensor giving you crap signal quality.

check the transceiver you're using and match it to the fiber. buy whichever is cheaper, for links of a hundred feet or so it makes almost no difference.

oh, um, those HP boxes might only work with certain transceiver modules. cisco was (and maybe still is) notorious for that, having special code made into their modules.