Hi Bob, If you want that FiWi infrastructure on buildings, I am afraid that you only get it (in the long term) with a law that makes it mandatory to make new buildings with that infrastructure for communications.
In Spain, it should be added to this: https://avancedigital.mineco.gob.es/Infraestructuras/Paginas/Index.aspx Regards, David > Date: Mon, 13 Mar 2023 21:27:23 -0700 > From: rjmcmahon <[email protected]> > To: Sebastian Moeller <[email protected]> > Cc: dan <[email protected]>, Jeremy Austin <[email protected]>, Rpm > <[email protected]>, libreqos > <[email protected]>, Dave Taht via Starlink > <[email protected]>, bloat <[email protected]> > Subject: [Starlink] On FiWi > Message-ID: <[email protected]> > Content-Type: text/plain; charset=UTF-8; format=flowed > > To change the topic - curious to thoughts on FiWi. > > Imagine a world with no copper cable called FiWi (Fiber,VCSEL/CMOS > Radios, Antennas) and which is point to point inside a building > connected to virtualized APs fiber hops away. Each remote radio head > (RRH) would consume 5W or less and only when active. No need for things > like zigbee, or meshes, or threads as each radio has a fiber connection > via Corning's actifi or equivalent. Eliminate the AP/Client power > imbalance. Plastics also can house smoke or other sensors. > > Some reminders from Paul Baran in 1994 (and from David Reed) > > o) Shorter range rf transceivers connected to fiber could produce a > significant improvement - - tremendous improvement, really. > o) a mixture of terrestrial links plus shorter range radio links has the > effect of increasing by orders and orders of magnitude the amount of > frequency spectrum that can be made available. > o) By authorizing high power to support a few users to reach slightly > longer distances we deprive ourselves of the opportunity to serve the > many. > o) Communications systems can be built with 10dB ratio > o) Digital transmission when properly done allows a small signal to > noise ratio to be used successfully to retrieve an error free signal. > o) And, never forget, any transmission capacity not used is wasted > forever, like water over the dam. Not using such techniques represent > lost opportunity. > > And on waveguides: > > o) "Fiber transmission loss is ~0.5dB/km for single mode fiber, > independent of modulation" > o) “Copper cables and PCB traces are very frequency dependent. At > 100Gb/s, the loss is in dB/inch." > o) "Free space: the power density of the radio waves decreases with the > square of distance from the transmitting antenna due to spreading of the > electromagnetic energy in space according to the inverse square law" > > The sunk costs & long-lived parts of FiWi are the fiber and the CPE > plastics & antennas, as CMOS radios+ & fiber/laser, e.g. VCSEL could be > pluggable, allowing for field upgrades. Just like swapping out SFP in a > data center. > > This approach basically drives out WiFi latency by eliminating shared > queues and increases capacity by orders of magnitude by leveraging 10dB > in the spatial dimension, all of which is achieved by a physical design. > Just place enough RRHs as needed (similar to a pop up sprinkler in an > irrigation system.) > > Start and build this for an MDU and the value of the building improves. > Sadly, there seems no way to capture that value other than over long > term use. It doesn't matter whether the leader of the HOA tries to > capture the value or if a last mile provider tries. The value remains > sunk or hidden with nothing on the asset side of the balance sheet. > We've got a CAPEX spend that has to be made up via "OPEX returns" over > years. > > But the asset is there. > > How do we do this? > > Bob > _______________________________________________ Starlink mailing list [email protected] https://lists.bufferbloat.net/listinfo/starlink
