DWDM Mux/Demux using 40G Optics

Mike Hammett nanog at ics-il.net
Mon Jun 19 20:17:00 CST 2017


I'd imagine they vary based on vendor, so you'd have to check with the specific vendor in terms of absolute technical specifications. 

A 1310 and 1550 port only allow those channels plus or minus some, manufacturer dependent. 
An expansion port passes everything not used by that device. 

Some manufacturers are even configurable pre-order, so you could get exactly what you needed (other than multiple 40G channels). 




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

Midwest-IX 
http://www.midwest-ix.com 

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

From: "Colton Conor" <colton.conor at gmail.com> 
To: "Faisal Imtiaz" <faisal at snappytelecom.net> 
Cc: "Mike Hammett" <nanog at ics-il.net>, "Luke Guillory" <lguillory at reservetele.com>, "nanog list" <nanog at nanog.org> 
Sent: Monday, June 19, 2017 3:14:19 PM 
Subject: Re: DWDM Mux/Demux using 40G Optics 


Thanks for the answers. From the sounds of it, no one knows the real difference between the expansion port, 1310 port, and 1550 port. For real world applications, I would assume the monitor port would be to plug in a handheld meter, and see which channels are coming through that node without breaking the ring. Not sure if their would be a monitor port for both directions is you were using a OADM? 


On Mon, Jun 19, 2017 at 2:38 PM, Faisal Imtiaz < faisal at snappytelecom.net > wrote: 





Answers in-line ... 


Faisal Imtiaz 
Snappy Internet & Telecom 
7266 SW 48 Street 
Miami, FL 33155 
Tel: 305 663 5518 x 232 

Help-desk: (305)663-5518 Option 2 or Email: Support at Snappytelecom.net 




<blockquote>
From: "Colton Conor" < colton.conor at gmail.com > 
To: "Mike Hammett" < nanog at ics-il.net > 
Cc: "Luke Guillory" < lguillory at reservetele.com >, "nanog list" < nanog at nanog.org >, "Faisal Imtiaz" < faisal at snappytelecom.net > 
Sent: Monday, June 19, 2017 3:30:37 PM 
Subject: Re: DWDM Mux/Demux using 40G Optics 




<blockquote>

I guess that is the real question. Besides the client ports that are clearly identified by channel number on Muxes, what channels can the special ports handle? 

http://www.fs.com/products/43723.html It has 4 special service port options: 

1. Expansion Port (Based on what I am seeing, I think this would be to stack another mux if you needed more channels. So I assume it allows all channels to be added besides the client channels?) 
</blockquote>



Exactly... this is basically a pass thru port, i.e. what is not getting mux/demux should get passed thru (keep the insertion loss in mind). 


<blockquote>


2. Monitor Port (I think this is just a tap that you would hook a monitor up to, and be able to see all channels coming through with a meter. I assume not a good idea to add/drop channels through this port)? 
</blockquote>



I don't use this port, but supposedly it will pass a fraction 5% of the light from the main port so that it can be monitored. May be someone else can offer some practical use for this port. 
<blockquote>


3. 1310nm Port (Labeled as 1310, but clearly allows more than just 1310 since tutorial is saying it supports QSFP+ which is 1270 - 1330 nm, so what range does it really support or is there no a range?) 
</blockquote>

Not sure about the range question, but this is the port for having the 40g/100g QSFP+ pass thru 


<blockquote>


4. 1550nm Port (Labeled as 1550nm, but I wonder if its like the 1330nm?) 


</blockquote>

I have not had the need to explore this in detail, but from my initial understanding, this can be used for ZR (long range optics) and or to stack a DWDM Mux 


<blockquote>


Would you recommend a monitor port on every mux you buy? 


</blockquote>

As I shared above, I don't. 




<blockquote>



On Mon, Jun 19, 2017 at 2:18 PM, Mike Hammett < nanog at ics-il.net > wrote: 

<blockquote>


Verify pass-through frequencies for the 1310 (or equivalent) for the passive mux in question. This would only work for a single channel. 




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

Midwest-IX 
http://www.midwest-ix.com 



From: "Luke Guillory" < lguillory at reservetele.com > 
To: "Faisal Imtiaz" < faisal at snappytelecom.net >, "Colton Conor" < colton.conor at gmail.com > 
Cc: "nanog list" < nanog at nanog.org > 
Sent: Monday, June 19, 2017 2:13:10 PM 
Subject: RE: DWDM Mux/Demux using 40G Optics 



Faisal, 

How would he inject his current 4x10 40g into the mux which is currently on a single LC cable? 





Luke Guillory 
Network Operations Manager 

Tel: 985.536.1212 
Fax: 985.536.0300 
Email: lguillory at reservetele.com 

Reserve Telecommunications 
100 RTC Dr 
Reserve, LA 70084 

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-----Original Message----- 
From: NANOG [mailto: nanog-bounces at nanog.org ] On Behalf Of Faisal Imtiaz 
Sent: Monday, June 19, 2017 2:02 PM 
To: Colton Conor 
Cc: nanog list 
Subject: Re: DWDM Mux/Demux using 40G Optics 

Answers in-line below. 



If you look at the CWDM Muxes (8 or 9 channel) you will notice a common configuration of 

Upgrade Port (expansion port) + 1450 or 1470 to 1610nm 

in the DWDM muxes you will see them listed as # of Port + 1310 pass thru channel. 

These are exactly what you are looking for ..... :) 



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</blockquote>

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