Re: [EXT] Re: Hi-Rise Building Fiber Suggestions

[Chuck Anderson <cra () WPI EDU>]

After 30 add/drops you may lose too much power.  There is a minimum 1.4dB per passthru and 1.3dB per add/drop, 3.5dB 
per MUX at the ends.

With these SFP+ modules:

https://www.fs.com/products/31238.html

it looks like you would have a 19-20 dB budget to work with.  You may be able to get 10 add/drops without amplification.

But they have amps too:

https://www.fs.com/products/72284.html

I'd definitely contact sales and talk to one of their engineers so they can design a complete working solution for you.

Are you sure you can't pull more fiber?  It may be cheaper.

On Wed, Feb 26, 2020 at 07:42:23AM -0600, Mike Hammett wrote:
> DWDM can be done fairly cheap. Some combination of MUXes and OADM modules along the way. One possible solution is: 
>
>
> First floor: https://www.fs.com/products/35887.html 
> Every floor between: https://www.fs.com/products/70427.html 
> Top floor: https://www.fs.com/products/35887.html 
>
>
> Every floor gets 10G to aggregation switches on the top floor and bottom floor. The aggregation switches directly 
> connect via the second pair. 
>
>
>
>
> ----- 
> Mike Hammett 
> Intelligent Computing Solutions 
>
> Midwest Internet Exchange 
>
> The Brothers WISP 
>
> ----- Original Message -----
>
> From: "Ryan Hamel" <ryan () rkhtech org> 
> To: "Bradley Burch" <bradley () wifastnetworks com> 
> Cc: nanog () nanog org 
> Sent: Tuesday, February 25, 2020 10:45:05 PM 
> Subject: Re: Hi-Rise Building Fiber Suggestions 
>
>
> How would that work to solve Norman's problem? That sounds like a lot of money spending, and setup time, for nothing. 
>
> Ryan 
>
> On Feb 25 2020, at 8:21 pm, Bradley Burch <bradley () wifastnetworks com> wrote: 
>
>
>
>
> Should consider DWDM or GPON and in those look at passive optical technologies that can benefit the project. 
>
> <blockquote>
>
> On Feb 25, 2020, at 9:33 PM, Norman Jester <nj () jester mx> wrote: 
>
> I’m in the process of choosing hardware 
> for a 30 story building. If anyone has experience with this I’d appreciate any tips. 
>
> There are two fiber pairs running up the building riser. I need to put a POE switch on each floor using this fiber. 
>
> The idea is to cut the fiber at each floor and insert a switch and daisy chain the switches together using one pair, 
> and using the other pair as the failover side of the ring going back to the source so if one device fails it doesn’t 
> take the whole string down. 
>
> The problem here is how many switches can be strung together and I would not try more than 3 to 5. This is not 
> something I typically do (stacking switches). I have fears of STP and/or RSTP issue stacking past Ethernet switch to 
> switch limits (if they still exist??) 
>
> Is there a device with a similar protocol as the old 3com (now HP IDF) stacking capability via fiber? 
>
> I’d like to use something inexpensive as its to power ubiquiti wifi on each floor. Ideally if you know something I 
> don’t about ubiquiti switches that can do this I’d appreciate knowing. 
>
> Norman 
>
>
> </blockquote>