am mai citit si m-am documentat un pic. este vorba despre un serviciu
VDSL pe care il veti gasi descris
aici.
o explicatie alternativa este
aiciaceasta tehnologie spre deosebire de
ADSL care este oferita de aceeasi
companie are singurul dezavantaj ca pe distante mari isi pierde din capacitatea de transfer. deci cu cit sinteti mai aproape de ONU (Optical Network Units) cu atit sinteti mai fericiti.
si un citat dintr-o lucrare de specialitate pentru cunoscatorii de lb engleaza:
"
DSL's Relationship with ADSLVDSL has an odd technical resemblance to ADSL. VDSL achieves data rates nearly 10 times greater than those of ADSL (shown in Figure 15-8), but ADSL is the more complex transmission technology, in large part because ADSL must contend with much larger dynamic ranges than VDSL. However, the two are essentially cut from the same cloth. ADSL employs advanced transmission techniques and forward error correction to realize data rates from 1.5 to 9 Mbps over twisted pair, ranging to 18,000 feet; VDSL employs the same advanced transmission techniques and forward error correction to realize data rates from 13 to 55 Mbps over twisted pair, ranging to 4,500 feet. Indeed, the two can be considered a continuum, a set of transmission tools that delivers about as much data as theoretically possible over varying distances of existing telephone wiring.
VDSL is clearly a technology suitable for a full-service network (assuming that full service does not imply more than two high-definition television [HDTV] channels over the highest-rate VDSL). It is equally clear that telephone companies cannot deploy ONUs overnight, even if all the technology were available. ADSL may not be a full-service network technology, but it has the singular advantage of offering service over lines that exist today, and ADSL products are closer in time than VDSL. Many new services being contemplated today---such as videoconferencing, Internet access, video on demand, and remote LAN access---can be delivered at speeds at or below T1/E1 rates. For such services, ADSL/VDSL provides an ideal combination for network evolution. On the longest lines, ADSL delivers a single channel. As line length shrinks, either from natural proximity to a central office or deployment of fiber-based access nodes, ADSL and VDSL simply offer more channels and capacity for services that require rates above T1/E1 (such as digital live television and virtual CD-ROM access)."
A: toate cele de mai sus sint pentru informare.
acum o intrebare: daca am abonament de 6Mbps la 25 EUR pot trece la cel de 20 Mbps la 9,9 EUR chiar daca perioada contractuala nu a expirat?
de ovibc » 27 Iul 2009, 06:59 
Eu la RDS cu 39 de ron, am si tel(nelimitat in retea) si Internet de 100 Mbps, care zbarnaie. 
