DWDM Mux/Demux using 40G Optics
colton.conor at gmail.com
Mon Jun 19 20:14:19 CST 2017
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>
> Answers in-line ...
> Faisal Imtiaz
> Snappy Internet & Telecom
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> *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
> 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
>> *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
>> How would he inject his current 4x10 40g into the mux which is currently
>> on a single LC cable?
>> Luke Guillory
>> Network Operations Manager
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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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