Απάντηση: Νέος tp για τον ΟΤΕ στον hellasat
Very-high-speed digital subscriber line 2 (VDSL2) is an access technology that exploits the existing infrastructure of copper wires that were originally deployed for POTS. It can be deployed from central offices, from fibre-fed cabinets located near the customer premises, or within buildings.
VDSL2 is the newest and most advanced standard of DSL broadband wireline communications. Designed to support the wide deployment of triple play services such as voice, video, data, high definition television (HDTV) and interactive gaming. VDSL2 is purported to enable operators and carriers to gradually, flexibly, and cost efficiently upgrade existing xDSL-infrastructure.
The protocol was standardized as ITU G.993.2 on February 17, 2006.
ITU-T G.993.2 (VDSL2) is an enhancement to G.993.1 (VDSL) that permits the transmission of asymmetric and symmetric aggregate data rates up to 200 Mbit/s on twisted pairs using a bandwidth up to 30 MHz.
VDSL2 deteriorates quickly from a theoretical maximum of 250 Mbit/s at source to 100 Mbit/s at 0.5 km (1,600 ft) and 50 Mbit/s at 1 km (3,300 ft), but degrades at a much slower rate from there, and still outperforms VDSL. Starting from 1.6 km (0.99 mi) its performance is equal to ADSL2+.
ADSL-like long reach performance is one of the key advantages of VDSL2. LR-VDSL2 enabled systems are capable of supporting speeds of around 1–4 Mbit/s (downstream) over distances of 4–5 km (2.5–3 miles), gradually increasing the bit rate up to symmetric 100 Mbit/s as loop-length shortens. This means that VDSL2-based systems, unlike VDSL1 systems, are not limited to short local loops or MTU/MDUs only, but can also be used for medium range applications.
Πηγή:wikipedia
Στην Αττική το 20-30% των οπτικών ινών έχουν περαστεί μέσα από υπόγειους αγωγούς κτλπ της Δεη ευδαπ κτλπ.(στα έργα της ευδαπ-ΔΕΗ μπορεί να δείτε ένα μάυρο σχετικά μεγάλο σε πάχος σωλίνα,απο εκεί περνάνε οι οπτικές.Εγώ έχω το πιλοτικό.Καλά πάει... στα 50mbps.