DWDM Mux/Demux using 40G Optics

Mon Jun 19 20:19:02 UTC 2017

My understanding is that ports on the client side would have cut filters for that color, having 1310 and 1550 are nice since you can hang gear you already have off the mux for OOB and so on. I don’t think I have any CWDM with expansion ports to test with.

We use the following for simple testing, is it there and what’s the power.

http://solid-optics.com/tools/power-meter/so-osa-cwdm-18ch-id1685.html

Luke Guillory
Network Operations Manager

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From: Colton Conor [mailto:colton.conor at gmail.com]
Sent: Monday, June 19, 2017 3:14 PM
To: Faisal Imtiaz
Cc: Mike Hammett; Luke Guillory; nanog list
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<mailto: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<tel:(305)%20663-5518>

Help-desk: (305)663-5518<tel:(305)%20663-5518> Option 2 or Email: Support at Snappytelecom.net<mailto:Support at Snappytelecom.net>

________________________________
From: "Colton Conor" <colton.conor at gmail.com<mailto:colton.conor at gmail.com>>
To: "Mike Hammett" <nanog at ics-il.net<mailto:nanog at ics-il.net>>
Cc: "Luke Guillory" <lguillory at reservetele.com<mailto:lguillory at reservetele.com>>, "nanog list" <nanog at nanog.org<mailto:nanog at nanog.org>>, "Faisal Imtiaz" <faisal at snappytelecom.net<mailto: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<mailto: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<mailto:lguillory at reservetele.com>>
To: "Faisal Imtiaz" <faisal at snappytelecom.net<mailto:faisal at snappytelecom.net>>, "Colton Conor" <colton.conor at gmail.com<mailto:colton.conor at gmail.com>>
Cc: "nanog list" <nanog at nanog.org<mailto: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<tel:(985)%20536-1212>
Fax:    985.536.0300<tel:(985)%20536-0300>
Email:  lguillory at reservetele.com<mailto:lguillory at reservetele.com>

Reserve Telecommunications
100 RTC Dr
Reserve, LA 70084

_________________________________________________________________________________________________

Disclaimer:
The information transmitted, including attachments, is intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material which should not disseminate, distribute or be copied. Please notify Luke Guillory immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. Luke Guillory therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. .

-----Original Message-----
From: NANOG [mailto:nanog-bounces at nanog.org<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 ..... :)