[c-nsp] Are these DWDM optics compatible?

Michael K. Smith - Adhost mksmith at adhost.com
Wed Oct 27 16:38:29 EDT 2010


Here is the ITU 100 GHZ grid.

http://www.telecomengineering.com/downloads/DWDM%20ITU%20Table%20-%20100
%20GHz.pdf

ITU 52 is 35.82.   Whether or not it will work at .92 is moot, IMO.  I
would tell your vendor to give you optics that follow the ITU grid.  .92
doesn't show up anywhere in the ITU grid, even at 50 Ghz.  The spectral
width on the optics is .2nm, but I wouldn't want to be sitting on the
edge of the acceptable limit.

Mike

--
Michael K. Smith - CISSP, GSEC, GISP
Chief Technical Officer - Adhost Internet LLC mksmith at adhost.com
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> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Steven Raymond
> Sent: Wednesday, October 27, 2010 11:20 AM
> To: Cisco Network Service Providers
> Subject: [c-nsp] Are these DWDM optics compatible?
> 
> Ordered part number DWDM-X2-35.82 , and received part labeled DWDM-
> X2-35.92 (non-Cisco branded X2 optics).  Vendor says oh they are close
> enough to work, there's a .2nm working range for ITU channel 52
signaling.
> In fact they claim that DWDM-X2-35.82 is the very same part, just with
a
> different (or in this case typoed) label on it.  Does anyone have
experience to
> confirm or reject the vendor's claim?
> 
> Looking here:
> http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6576/data
> _sheet_c78_489725.html
> I can almost buy their argument, and google perhaps confirms by
returning
> "No results found for "DWDM-X2-35.92"."  Makes me wonder if all these
> parts are simply the same hardware, and upon ordering they simply tune
the
> frequency into an eprom for whatever was ordered, apply a label and
ship it
> out?
> 
> Thanks!
> 
> 
> 
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