bio1712 Ok l'articolo chiarisce i miei dubbi. Riporto delle parti interessanti.
Prima parla dell'ipotesi di applicare G.fast direttamente sull'ARL:
The most cost effective way to do this would be to reach out from the cabinet with a ‘long reach G.fast technology’ over the last 250-300 meters to the customer premises. For this kind of architecture, however, the technology is still under standardisation approval and won’t be available to operators in short term.
Poi dice che forse è meglio accorciare le distanze ed arrivare ad un punto vicino alle chiostrine, più vicino dell'armadio insomma:
Today’s G.fast technology is able to cover the last 100-150 meters of the loop in a pure FTTdp architecture, where the drop point could be a distribution box near to the building (e.g. the so-called “chiostrina”). In this scenario, a big deployment advantage is the use of the reverse powering feeding (RPF), allowing powering of the Drop Point Unit (DPU) over the copper pair via power injectors located at customer premises.
Se capisco bene il drop point è il punto dove arriva la fibra ottica (?).
Stimano 700 Mbps di prestazioni con vectoring, a 100-150 metri di distanza.
TIM has been working over G.fast technology in the last 2 years and measured together with ADTRAN that the reachable performances over Italian usual last 100-150 meter cables are around 700Mbps aggregated line rate when vectoring is enabled and a spectrum between 2.2MHz and 106MHz is used with RPF. In case of connections below 100m length, the current performances show aggregated rates above 800Mbps under the same conditions.
Per quanto riguarda i costi:
Cost savings in comparison to a pure FTTH and speed of deployment are also areas being observed.
Il vantaggio più importante sarebbe il riciclo (ennesimo) del rame:
The strength of G.fast technology lies in allowing the cost effective and timely reach of customer premises without the need for drilling inside a house and laying fiber up to the home network, an activity that typical end customers would like to avoid or fully reject when it comes to a new service offering.
Dicono che l'obiettivo sarebbe sfruttare la fibra ottica che già passa sotto le strade, "intercettandola":
G.fast is therefore seen as a complimentary possibility to allow an extended FTTH coverage, leveraging on an existing fiber that often passes by the buildings and could be intercepted outside of those without the need for digging into the buildings.