Fiber Optic 62nm or 50nm doubt?

[klabacita]

 I have to connect 2 buildings to the IT server room, 1 is 230m long and the other 180m.

 Now there we need to send fiber from our server room to each one, we have switches procurve 2650 which have this Transceiver options.

ProCurve Gigabit-SX-LC Mini-GBIC (J4858B)
Maximum distance:
220 m (62.5 µm core diameter, 160 MHz/km bandwidth)
275 m (62.5 µm core diameter, 200 MHz/km bandwidth)
500 m (50 µm core diameter, 400 MHz/km bandwidth)
550 m (50 µm core diameter, 500 MHz/km bandwidth)

ProCurve Gigabit-LX-LC Mini-GBIC
Maximum distance: 10 km (single mode) or 550 m (multimode)

The other is not a standard but is for longer distance not my case.

The building A(230m) have around 60 users, building B(180m) around 20 users.

I want to take advantage of the 1Gb links but my doubt is about what fiber+transceiver to chose?

1)My understanding say I need this

ProCurve Gigabit-SX-LC Mini-GBIC (J4858B)

Because I don have very long distance, do I'm right?

2) Now, the last and most important I think is what type of fiber to chose to get

220 m (62.5 µm core diameter, 160 MHz/km bandwidth)
275 m (62.5 µm core diameter, 200 MHz/km bandwidth)
500 m (50 µm core diameter, 400 MHz/km bandwidth)
550 m (50 µm core diameter, 500 MHz/km bandwidth)

Here is my doubt, 1 think is Multi-Mode I'm sure(?), but what diameter of fiber?

62.5nm is well know for me, but any this 4 will give to me 1Gb speed knowing my distance?

Any technical comment to help me chose the best one for my network will be appreciate.

Thanks!!!

[Vince-Whirlwind]

Go with OM3 fibre (50µm) and SX transceivers.

[FranoM]

Even the distance fit for multimode fibre, I prefer to put monomode fibre which allow more features for future.

e.a 10 Gb (J9151A) or single mode (J9143B & J9142B)

Clearly it depend on the way you can easily or not replace the fibre cable when needed in the future.

Regards,

[EricAtHP]

Both 62 and 50 µm fiber are multimode. Single mode fiber is in the 8 µm range. Single mode fiber and transceivers have a higher cost.

[Vince-Whirlwind]

I agree with FranoM: it is becoming more and more common to install singlemode fibre in this sort of situation.

But Eric makes a good point: The downside of using singlemode is that you cannot use SX transceivers, you need to use LX instead, which are more expensive.

Check out the costs difference and go singlemode if you can afford it.

[klabacita]

Sorry for my delay, I was with overload at work.

Thanks all for the time u took to answer and share your knowlegde.

 Now, this bring me some other doubts about fiber, I want to be ready for the future and if we decide to move from 1g to 10g our fiber will ready.

If I add fiber 10g speed, can I use now transeivers of 1g and latter just change my transceivers to 10g?

Thanks for your time!!!

[Vince-Whirlwind]

Yes.