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" <r...@rkhtech.org> > To: "Bradley Burch" <brad...@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 <brad...@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 <n...@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>
