Good (cheap) 2000Mb/s solution?

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1

I need a good, cheap (its temporary) solution to run 2000mb/s over a single
pair of multimode fiber (SX handoffs). I'd ideally like to put in two GEs,
and get two out. I could use 10G gear, or OC48 gear, but I was hoping for
something less pricey since this only has two run about 200ft between two
buildings.

Any suggestions? I will be glad to summarize for anyone who wants it.

Thanks,

Deepak Jain
AiNET

2

I've heard of people who use a pair of SX gbics (1310nm), and a pair of LX
gbics (1550nm), and a cheap WDM splitter to get two GigE's down one pair
of fiber.

Simon

3

That's exactly the sort of solution I was hoping for. Any suggestions on
cheap WDM splitters?

Thanks,

Deepak

4

Good idea, I'm gonna try that... :slight_smile:

For scaling past that, Cisco makes CWDM GBICs that operate in existing
gear, where you can get 8 wavelengths and run them over a WDM splitter.

Alas no one that I know of makes a simple cheap 1U box that does 8xGigE
in and 1 fiber pair out.

5

Dunno about internationally, but in the UK I've seen these for sale by
RS - Goto rswww.com and search for partnumber 300-8372. They appear to
be made by AMP, so I'm sure they can be sourced locally.

(Looking at that product also corrects me to 850nm for SX and 1310 for LX)

Simon

6

MRV Communications makes various coarse WDM GigE solutions.
One that might be of use to you is: http://www.mrv.com/product/MRV-WDM-WDM44MMX

Bob

7

Simon Lockhart wrote:

I've heard of people who use a pair of SX gbics (1310nm), and a pair of LX
gbics (1550nm), and a cheap WDM splitter to get two GigE's down one pair
of fiber.

  Cool, so long as your splitter actually handles 1000BASE-SX (850nm)...
launched into multimode...? Hmm. Does that fly? 1000BASE-LX is
1310nm, and some proprietary LR stuff goes into the 1500s. Those GBICs
ain't so cheap as SX, but hey.
  Or maybe you're thinking of 10GBASE-Ex? (Ow! My wallet!)

Peter E. Fry

8

Canary makes a good WDM solution.

http://www.canarycom.com/products/wdmulti/p1.htm

Justin Shore

9

This would be my suggestion too but you dont need any WDM kit as you already are
using different wavelengths, its possible to buy whats essentially a 3 way fibre
connector and just connect both cards in and your fibre out. I believe these
splitters are about $150.

Steve

10

"Stephen J. Wilcox" <steve@telecomplete.co.uk> writes:

This would be my suggestion too but you dont need any WDM kit as you already are
using different wavelengths, its possible to buy whats essentially a 3 way fibre
connector and just connect both cards in and your fibre out. I believe these
splitters are about $150.

Don't forget to add in the appropriate losses into your link budget if
you're going more than a couple hundred feet (not the case with the
original post, but worth noting). Theoretical losses for a 50/50 beam
splitter would be about 3dB, with about 3dB for the recombiner as
well... but if memory serves the actual real-world additional losses
when one adds splitters to both ends is about 10dB, which would
suggest an additional 2dB of random inefficiency per splitter (quite
believeable).

Others on the list can attest to success with 90/10 beamsplitters
running full-duplex on a single fiber, at least with 100baseFX.
Recommend www.netoptics.com as a good, responsive source for
splitters/taps.

                                        ---Rob

11

Canobeam lasers?

Curtis

12

Canobeam lasers?

We've been using some of the gigabit-rate Canobeams and they work
great (though SNMP is broken)... but, I wouldn't call them cheap...

Eric :slight_smile: