I've been doing a bit of reading recently which indicates that VDSL and VDSL2 are up coming WAN technologies. Apparently in Asia they are projecting that VDSL2 will replace ADSL soon.
As far as I understand VDSL is similar to ADSL in the fact that it runs over POTS and if I'm not mistaken also over ATM circuitry...
Really, I was just interested in Cisco's and industry takes on these types of technology. As in where they would be headed and what sorts of speeds would be available.
I am pretty certain that ADSL maxes out at 22-24Mbps (currently my ISP supports up to 20Mbps which I have) downstream with up to 2Mbps upstream although again my ISP claims 2.5Mbps.... although gives me ~1Mbps?
With VDSL it seems that downstream speeds have increased to about 50Mbps although may not be currently available but the technology has the capacity to sustain those speeds. I'm not sure about upstream though which currently is at round 1-2Mbps.
Obviously there is a big price difference between ADSL and VDSL when compared to other high speed technologies such as G.SHDSL and MetroEthernet, so for small to medium sized businesses which technology would be a better choice?
- Of course you have to decide whether to go Synchronous or Asynchronous, although with most ISP's supplying only 2Mbps through G.SHDSL one has to wonder if this technology is even worth looking at for the ~$500/month line rental fees (approx.)on it while the equivalent VDSL2 technology in comparison seems to handle faster downstream and upstream bandwidth while being much cheaper.
Also I guess one would have to look at the number of supported devices; of which currently Cisco are offering only the 881v model to connect to VDSL while many more models through the 87x, 88x, and 89x and including the 18xx series come with either ADSL or G.SHDSL modems. - although one could look at obtaining a model with no modem just the routable FastEthernet ports and then coupling that with an external DSL modem which would be more cost efficient.
-- However, since most manufacturers these days are making embedded routers with modems, standalone modems are very difficult to find and on top of that manufacturers similar to Cisco's standard and quality are even more difficult to find since Cisco don't manufacture modems just HWICS for the larger modular routers it would be interesting to see what to couple to a FastEthernet WAN port router?
Also for say a small web hosting provider with not much budget so MetroEthernet would be out of the question, G.SHDSL bandwidth doesn't seem high enough to sustain multiple HTTP download requests, considering that todays Flash and Java websites need about 1-2Mbps upstream (server side) minimum to handle only a handful of users.
Without doing a traffic flow analysis, how does one decide to go for the best solution irrespective of budget for line rental and way up which hardware will fit the bill the best either in this ever changing pool of technologies?
Any thoughts or comments would be really appreciated!! Many thanks