Re: DWDM Mux/Demux using 40G Optics

[Faisal Imtiaz <faisal () snappytelecom net>]

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 () Snappytelecom net 

> From: "Colton Conor" <colton.conor () gmail com>
> To: "Mike Hammett" <nanog () ics-il net>
> Cc: "Luke Guillory" <lguillory () reservetele com>, "nanog list" <nanog () nanog org>,
> "Faisal Imtiaz" <faisal () 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 () 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 () reservetele com >
> > To: "Faisal Imtiaz" < faisal () snappytelecom net >, "Colton Conor" <
> > colton.conor () gmail com >
> > Cc: "nanog list" < nanog () 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 () reservetele com

> > Reserve Telecommunications
> > 100 RTC Dr
> > Reserve, LA 70084

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> > -----Original Message-----
> > From: NANOG [mailto: nanog-bounces () 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 ..... :)