Re: Hi-Rise Building Fiber Suggestions

[Baldur Norddahl <baldur.norddahl () gmail com>]

At the very minimum use bidirectional modules so you will have four
channels. That way you would only have 15 switches on a chain. Also be sure
to configured your STP weight so the cut will be in the middle. So one
fiber will normally be transmitting to 7 switches, the other fiber to the
other 8 switches.

This is still inferior to the WDM solutions proposed, but I fear you have
multimode fiber and might not have that choice.

Regards,

Baldur


On Wed, Feb 26, 2020 at 3:33 AM 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