VDSL2 [ Edited ]

[ato-1141]

VDSL 2 has come out and I wonder if att will take avantage of this technology. And the max theoritcal speed for VDSL2 is  100Mpbs up and 100Mpbs down. And there is even talk of VDSL3 which is faster. Centurylink at the current moment is using VDSL2 and speeds of 40 down and 20 up. Will ATT start to incorporate this? 

[maverick8550]

Oh gosh I hope sooo!!!

[SomeJoe7777 ACE - Geek]

AT&T's U-Verse VDSL implementation has been using VDSL2 since 2009.

[ato-1141]

Where does it say that ATT takes advantage of VDSL2? And if its true why wouldnt they up the speeds?  When will we see what centurylinke offers?

[bauwls]

Are you trolling or what? Do a search for VDSL2 on these forums. It's a well known access technology that AT&T uses. Specifically, they use Alcatel-Lucent VDSL2 SAI (VRAD) equipment in certain areas. In other areas where U-verse is available, ADSL2+ is implemented.

There's a nice technical explanation here: http://adslm.dohrenburg.net/uverse/

AT&T has released press releases that they are planning on upgrading to (forget the exact number) ~100Mbps for bandwidth profiles. It certainly looks like there are atleast a few cities where U-verse and Centurylink have the opportunity to repeat (map shown here). Perhaps that is one of the many reasons they've decided to invest in major upgrades.

[ato-1141]

Um... It was just a simple question I was asking. I hope that at&t will boost speeds. 

[gregzoll_1]

ato-1141, only way would to pair bond all residences and businesses, or pull Fiber to the premise. Keep in mind, prices would go up for the higher speeds. If you want higher speeds with ATT, if you really need them, there is always Hybrid laser tech over Fiber.

[unrtechie]

Some of the speed depends on the line profile being used.  Currently U-Verse uses a profile 8 spectrum, but could just as easily speed up if another profile is used.  Take a look at the table below from Wikipedia, it gives you an idea of how faster speeds could be deployed on a single pair. Just something to keep in mind.  Don't know what the future will bring but there's room for improvements without having to make major changes.

Profile Bandwidth (MHz) Number of carriers Carrier bandwidth (kHz) Power (dBm) Max. downstream throughput (Mbit/s)

8a	8.832	2048	4.3125	+17.5	50
8b	8.832	2048	4.3125	+20.5	50
8c	8.5	1972	4.3125	+11.5	50
8d	8.832	2048	4.3125	+14.5	50
12a	12	2783	4.3125	+14.5	68
12b	12	2783	4.3125	+14.5	68
17a	17.664	4096	4.3125	+14.5	100
30a	30	3479	8.625	+14.5	200

---

I am an AT&T employee and the postings on this site are my own and don’t necessarily represent AT&T’s positions, strategies or opinions.

[JefferMC ACE - Wizard]

---

unrtechie wrote:

Some of the speed depends on the line profile being used.  Currently U-Verse uses a profile 8 spectrum, but could just as easily speed up if another profile is used.  Take a look at the table below from Wikipedia, it gives you an idea of how faster speeds could be deployed on a single pair. Just something to keep in mind.  Don't know what the future will bring but there's room for improvements without having to make major changes.

Profile Bandwidth (MHz) Number of carriers Carrier bandwidth (kHz) Power (dBm) Max. downstream throughput (Mbit/s)

8a	8.832	2048	4.3125	+17.5	50
8b	8.832	2048	4.3125	+20.5	50
8c	8.5	1972	4.3125	+11.5	50
8d	8.832	2048	4.3125	+14.5	50
12a	12	2783	4.3125	+14.5	68
12b	12	2783	4.3125	+14.5	68
17a	17.664	4096	4.3125	+14.5	100
30a	30	3479	8.625	+14.5	200

...

---

Firstly, I'm not so sure about that table and that U-verse uses the profile 8, because, well, that would limit U-verse to 8 Mbits, when it obviously uses more.

That said, any increase in bandwidth using standard VDSL2 technologies would require shorter maximum run lengths from the VRAD to the RG.  The current profiles employed are a tradeoff in number of potential customers within the nominal service distance of the VRAD and the bandwidth they can get.

[SomeJoe7777 ACE - Geek]

U-Verse uses profile 8d. Even though the bandwidth is only about 8.8 MHz, the data rate is much higher due to the modulation scheme used (orthogonal frequency division multiplexing, or OFDM).

[JefferMC ACE - Wizard]

Ah, yeah.  Forgot about that.