Re: Low cost WDM gear

[Mike Hammett <nanog () ics-il net>]

I'm surprised how many people (operators and vendors) in the fixed wireless space don't get down to the specs (or 
provide the proper info) to just figure out how it'll work before hanging the gear. 

I shouldn't be surprised, though. People are lazy (myself included). 




----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 

----- Original Message -----

From: "Faisal Imtiaz" <faisal () snappytelecom net> 
To: "Rodrigo 1telecom" <rodrigo () 1telecom com br> 
Cc: "NANOG" <nanog () nanog org> 
Sent: Saturday, February 7, 2015 2:44:19 PM 
Subject: Re: Low cost WDM gear 

If you pay close attention to the Spec Sheets, on power output, insertion loss, sensitivity, and do the proper 
calculation for your link, then using anyone's products, passive or active will work unless the devices do not meet 
specified specs. 

If you don't do your homework, cals on the design, loss, and just buy stuff based on whatever, then it does not matter 
who the mfg. is, you are very very likely to be surprised in a bad way. 

:) 

Faisal Imtiaz 
Snappy Internet & Telecom 

----- Original Message ----- 
> From: "Rodrigo 1telecom" <rodrigo () 1telecom com br> 
> To: "Kenneth McRae" <kenneth.mcrae () me com> 
> Cc: "NANOG" <nanog () nanog org> 
> Sent: Saturday, February 7, 2015 3:24:43 PM 
> Subject: Re: Low cost WDM gear 
>
> What others vendors do you using? Here in Brazil only PADTEC have this 
> passive solution... Some days ago Digitel contact me to show your multiplex 
> solution... Is a active solution... 
> We import this from fiberstore, but i don't know others vendors to buy 10G 
> sfp+ cwdm and this mux/demux... 
>
> Enviado via iPhone  
> Grupo Connectoway 
>
> > Em 07/02/2015, às 16:04, Kenneth McRae <kenneth.mcrae () me com> escreveu: 
> >
> > Hi Enviado, 
> >
> > I cannot recommend FiberStore as I had a bad experience with them. I 
> > needed to cover only 3km from A to B side. When using 10km optics, I saw 
> > a loss of over 5db with their passive mux inserted into the path which 
> > created a total loss of over -20db which is outside of the tolerances for 
> > our equipment with 10km SFP+. Using another vendors low insertion loss 
> > mux corrected our issue. I am sure if you are using an 80km optic, you 
> > may be able to tolerate a higher insertion loss to cover < 60km. I also 
> > notice that their CDWM optics averaged about 3db less in power output when 
> > compared to other vendors. 
> >
> > Thanks 
> >
> > Kenneth 
> >
> > > On Feb 07, 2015, at 10:33 AM, Rodrigo 1telecom <rodrigo () 1telecom com br> 
> > > wrote: 
> >
> > > Hi kenneth... which the distance do you have from side A to side B when 
> > > you using passive solutions from fiberstore( mux and demux)? 
> > > I buy this mux and demux(4 channels single fiber) and only make a test 
> > > about 60km( mux side A and demux on side B) with sfp+10gb for 80km... ( 
> > > only see ddm on my ex3300( about -19db for 60km). Test switch access with 
> > > ssh and pinging tests... 
> > > What kind os issue do you have? For distances less than 60km is this 
> > > solution good? 
> > > Thanks!!! 
> > >
> > > Enviado via iPhone  
> > > Grupo Connectoway 
> > >
> > > > Em 07/02/2015, às 14:55, Kenneth McRae <kenneth.mcrae () me com> escreveu: 
> > > > Mike, 
> > > > I just replaced a bunch of FiberStore WDM passive muxes with OSI Hardware 
> > > > equipment. The FiberStore gear was a huge disappointment (excessive 
> > > > loss, poor technical support, refusal to issue refund without 
> > > > threatening legal action, etc.). I have had good results from the OSI 
> > > > equipment so far. I run passive muxes for CWDM (8 - 16 channels). 
> > > > On Feb 07, 2015, at 09:51 AM, Manuel Marín <mmg () transtelco net> wrote: 
> > > > Hi Mike 
> > > > I can recommend a couple of vendors that provide cost effective 
> > > > solutions. 
> > > > Ekinops & Packetlight. 
> > > > On Saturday, February 7, 2015, Mike Hammett <nanog () ics-il net> wrote: 
> > > > I know there are various Asian vendors for low cost (less than $500) 
> > > > muxes 
> > > > to throw 16 or however many colors onto a strand. However, they don't 
> > > > work 
> > > > so well when you don't control the optics used on both sides (therefore 
> > > > must use standard wavelengths), obviously only do a handful of channels 
> > > > and 
> > > > have a distance limitation. 
> > > > What solutions are out there that don't cost an arm and a leg? 
> > > > ----- 
> > > > Mike Hammett 
> > > > Intelligent Computing Solutions 
> > > > http://www.ics-il.com 
> > > > -- 
> > > > TRANSTELCO| Manuel Marin | VP Engineering | US: *+1 915-217-2232* | MX: 
> > > > *+52 
> > > > 656-257-1109* 
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