[c-nsp] Connecting PoP's with long distance

Sun Sep 7 09:31:42 EDT 2014

Hello Tim!
Now I haven't any optical measurments. I think in two weeks I can do it and
show to you and other guys. Thank you for advice!
How do your 10g link on 110 km now works? You did dwdm or just use link
aggregation with 1g ports?

2014-09-06 14:29 GMT+04:00 Tim Rayner <Tim.Rayner at aarnet.edu.au>:

> Hi Murat & others,
>
> Do you have insertion loss measurements for the individual or combined
> paths ?  Any measurements should be taken at 1550nm.
>
> EDFA Amplifiers at your intermediate points could work - you would
> probably get away with EDFA at one point - 80km plus 40km should be quite
> OK. Depending upon the EDFA Amps and their input power range, you could
> even boost the signal as you receive it at each end - after 120km -
> avoiding intermediate active gear altogether.
>
> If the fibre is not too poor, you may also be able to avoid EDFA or
> intermediate re-gen all-together - I'd suggest trying it as a single
> "patched-through" link. You need to keep in mind that chromatic dispersion
> can become an issue for 10Gbps at a distance >= 80km. We've had a 10Gbps
> link recently of > 110km that didn't work with an 80km optic at 1560.61nm
> (even though the received power was OK), but worked with an 80km 1530.33nm
> optic - (dispersion is reduced at the shorter wavelength).
>
> If I was trying this, I'd first try a pair of 100km rated 1550nm optics
> like these:
>
> http://www.flexoptix.net/en/produkte/transceiver/xfp-zr-transceiver-10-gigabit-stm64-sm-1550nm-100km-25db-ddm-dom.html
>
> Or if dispersion turns out to be the limiting issue, then there is a good
> chance that a 1470nm version of the CWDM XFP part could do the trick (lower
> chromatic dispersion at 1470nm than 1550nm, but perhaps slightly higher
> loss)
>
> http://www.flexoptix.net/en/produkte/transceiver/xfp-cwdm-transceiver-10-gigabit-sm-1270-1610nm-70km-23db-ddm-dom.html
> - 1470 will be out of the range where EDFA Amps can help you, but these
> two options could avoid EDFA all-together.
>
> I'd try one or both of these options - If the link comes up, you can know
> how much margin you have by reading the DoM stats, or you could check that
> it still works after inserting say a 2dB attenuator in both the TX and RX
> path.
>
> Its so much simpler to try it with the longest range optics you can find
> at each end that I'd strongly favour trying that first - before looking at
> re-gen at one or both of the intermediate sites, or Amplification either at
> each and, or at one intermediate site.
>
> Good Luck!
>
> I'd be interested to hear what you try and how it works for you.
>
> Tim.
>
>
> Tim Rayner
> Optical Engineer, AARNet Pty Ltd
> street address: Building 9, Banks Street, YARRALUMLA ACT 2600
> postal address: GPO Box 1559, CANBERRA ACT 2601
> t. +61 2 6222 3575 f. +61 2 6222 3535 e. Tim.Rayner at aarnet.edu.au
> w. www.aarnet.edu.au
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> ________________________________________
> From: cisco-nsp [cisco-nsp-bounces at puck.nether.net] on behalf of Ivan [
> cisco-nsp at itpro.co.nz]
> Sent: Saturday, 6 September 2014 12:14 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Connecting PoP's with long distance
>
> Hi Jared,
>
> This is something I have also been looking at. Is there any particular
> brand of XFP you have had success with?
>
> If we take the Cisco "80km" ZR we have TX 0 to 4 dBm and RX -7 to -24
> dBm - worst case 24dB budget excluding splices, patches etc. Assuming
> 0.2dB/km 120km would be right on the limits. I would like to have some
> buffer.
>
> Thanks
>
> Ivan
>
> On 5/Sep/2014 1:32 a.m., Jared Mauch wrote:
> > You should be able to do 120km with a ZR XFP @ 10G without anything.
> >
> > If you later want to add equipment to the sites, you can look at
> doubling your optics and something like this:
> >
> >
> http://www.perle.com/products/10-Gigabit-Standalone-Media-Converters.shtml
> >
> > - Jared
> >
> >
> >> On Sep 4, 2014, at 5:36 AM, Murat Kaipov <mkkaipov at gmail.com> wrote:
> >>
> >> Hello Guys.
> >>
> >> I need connect two PoP's with 10G links. Distance between PoP's nearly
> >> 120km. We have fiber optic between PoP's with two regeneration points
> >> located nearly in 40 km between each other. We have not DWDM. Can you
> advise
> >> some equipment (May be like EDFA) for fiber optic regeneration points
> >>
> >> Scheme like this
> >>
> >> PoP-1 ---40km---[Regeneration point1]---40km----[Regeneration
> >> point2]-----40km------PoP2
> >>
> >> Thank you.
> >>
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