Very High Speed Digital Subscriber Line 2

[NOD 32]

Zanimalo me je kako ponuja VDSL2 amertško podjetje AT&T, in dobil tale odgovor

NAVAJAM:
VDSL2 (Very High Speed Digital Subscriber Line 2) is an access technology that exploits the existing infrastructure of copper wires that were originally deployed for POTS services. 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 enables operators and carriers to gradually, flexibly, and cost efficiently upgrade existing xDSL-infrastructure.

It has been standardized as ITU G.993.2.

ITU-T G.993.2 (VDSL2) is an enhancement to G.993.1 (VDSL) that permits the transmission of asymmetric and symmetric (Full-Duplex) 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 (1640 ft) and 50 Mbit/s at 1 km (3280 ft), but degrades at a much slower rate from there, and still outperforms VDSL. Starting from 1.6 km (1 mile) 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 to 5 km (2 ½ to 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.

VPRAŠANJE
V tekstu je navedeno, da VDSL deluje s 250 mbit/s in na razdalji do 4-5 km zračne centrale, pri podjetju T-2 pa ista povezava deluje le z 60mbit/s in le na 2500 metrov zračne razdalje

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LP NOD 32

[Sadarj79]

"theoretical maximum"

to dost pove

[NOD 32]

100 Mbit/s na 0.5 km zračne razdalje

to pe še bolj dost pove

[T2_Delavec]

Glede T-2 je to takole: ponujamo max paket 60/25 (stranka lahko vzame tudi še kakšno TV ali 3) in pa max domet na 2500 metrov okvirne zračne (so že nekateri, ki so priklopljeni na več kot 4.0 km žice).

[NOD 32]

NN, če vam uspe dvigiti povezano na 200 mbit/s, se bo domet optimalnega delovanja storitev dvignil najmanj na 5000 metrov zračne razdalje

[T2_Delavec]

Med drugim je pomembna tudi debelina (presek parice)!

[NOD 32]

Do 5000 metrov zračne razdalje se da rešit z ojačevalcem, za daljše razdalje od centrale pa ne vem

[T2_Delavec]

Potrebno je tudi dosledno upoštevati pravila, ki jih postavi lastnik paric - v Sloveniji je to Telekom.

[Abigor]

Do 5000 metrov zračne razdalje se da rešit z ojačevalcem, za daljše razdalje od centrale pa ne vem

Pol pa svizec zavije čokolado. Seveda se vse da, samo interesa ni.