ONS 15454 DWDM

[Keith McElroy]

Hello,

I am still pretty new to the ONS product line, but have a reasonable understanding of the DWDM technology. I am looking to run two point to point dark fiber links between two colos within about 3KM of one another. Ideally, I would like to support 32 channels of 10G as we are a service provider and frequently carry multiple customer GE links between the sites. I am still a bit confused as to what Cisco offers for the ONS line that is capable of this.

[Ryan Gadwood · Accepted solution]

Keith,

There are a few options you could use in this situation. Below are a couple solutions but not including all.

Since your distance is short(only 3km) you should not need a full MSTP 15454 shelf with amplifiers. Depending on your application of the 10G circuits you may need a 15454 to hold Transponder cards that would change the wavelength to a DWDM wave. It could also be possible for you buy wavelength specific SFPs/XFP's for your equipment which could bypass having the 15454 shelf all together.

As far as the DWDM system between the sites you could use a MD-40-ODD or MD-40-EVEN depending on what wavelengths you plan on using. This will give you 40 channels. See link(http://www.cisco.com/en/US/docs/optical/spares/15216/guide/15216_Patch_Panel.html)

Keep in mind there will be a total max 12db(6db per side max) insertion loss when using the MD-40's so make sure the SFPs/XFPs have the correct Tx/Rx optical specifications.

Also you can reference a GBIC/SFP/XFP doc for part numbers, optical and hardware specs, etc..

http://www.cisco.com/en/US/docs/optical/spares/gbic/guides/ppms2.html#wp185095

Hope this information can get you started in the right direction.

Ryan

[Keith McElroy]

On that link you gave for the MD-40, is that a pure patch panel? I assume I would still need the actual 15216 box to run DWDM, is that correct?

[Ryan Gadwood]

Keith,

Not sure I understand the term "pure" patch panel but this is part of the Cisco 15216 family. It has 40 DWDM channels spaced at 100GHz on the Odd or Even ITU grid depending on if you get the Even or Odd panel. Basically you will have your Com Tx and Rx ports hooking up to the fibers going between the buildings. You will then have your 10G circuits hooking up to the wavelength ports on both ends. Everything will be on the MD-40-ODD panel(also referred to as Cisco ONS 15216 40-Channel Mux/Demux Patch Panel). Hope this answers your question.

Ryan

[Keith McElroy]

So if I understand correctly, the card on the 15454 would convert to the proper wave and the passive patch panel would just mux/demux to the line? I thought you were saying the patch was a standalone, I believe I misunderstood.

Is there a product from Cisco that can do it all on a reasonable sized box(2-4U)? I believe all I would really need for the point to point setup is just a mux/demux and a transponder at this point, is that correct?

[Ryan Gadwood]

Keith,

You are correct about the 15454 card converting to proper wavelength and then the MD-40 would just be a mux/demux to the line.

As far as products that you could use to start off with just one or two waves would be at the following link.

http://www.cisco.com/en/US/products/ps11144/index.html

The M2 is the smallest you could go with. Im not sure of the RUsize but I think it is around 2-4U like you need. This Chassis has 2 slots for transponder cards. If you went with a OTU2_XP card you could get two 10G circuits per card. Or you could just use a standard TXP_MR_10G card which will transpond one 10G circuit.

There is also the M6 and M12 shelves which have more slots and will be bigger in RU size. They are also on the link above.

Hope this helps.

Ryan

[Tom Randstrom]

You can use a pair of the 15216 100GHz Terminal Filters for your point to point link (I think they are still orderable).  

http://www.cisco.com/en/US/products/hw/optical/ps1996/prod_bulletin09186a0080091f9e.html

Start with a pair of the 16 channel Red filters and upgrade later with the Blue filters when you need 16 additional wavelengths.  Feed the mux/demux wavelengths with appropriate DWDM optical interfaces from your routers, switches or aggregated services from 15454 line cards (transponders, muxsponders, OC-N, Ethernet, or whatever).

Simple, Fast and Easy!