DWDM Mux/Demux using 40G Optics

Faisal Imtiaz faisal at snappytelecom.net
Mon Jun 19 21:52:16 CST 2017


>>From the sounds of it, no one knows the real difference between the expansion port, 1310 port, and 1550 port 

Hmm.. not sure how you are reading this... 
I believe that there is no 'standard' and as such the actual filter on the mux/demux you are using may vary by mfg. 
I can confirm what is an expansion port... (pass everything thru that is not being filtered by the mux/demux ) 
I can also confirm that Fiberstore 1310nm port (not to be confused with the CWDM 1310 port) will pass all 4 wavelengths for 40g/100g optics. 
I don't have experience with the 1550nm 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. 

Correct that is what it is designed for..... it allows a fraction of light (I am guessing would also cause an increase in insertion loss figure). 

>> Not sure if their would be a monitor port for both directions is you were using a OADM? 
If you look at the OADM's e.g. like a Cisco CWDM OADM with monitor ports, you will see that they are on both sides east & west. 

Regards. 

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 

> 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 4:14:19 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

>>> 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

>>> 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?)

>> 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).

>>> 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)?

>> 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.

>>> 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?)

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

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

>> 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

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

>> As I shared above, I don't.

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

>>>> 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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