Translating U-Verse Speed

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I think I'm having a brain fart.  I'm signed up for 6GB service on a
new AT&T U-Verse Internet install and this is what the modem config
says:

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DSL Details
Modem Type     Built in modem - ADSL/VDSL

DSL Line     Line 1 (inner pair)
                Down            Up
User Rate     13215 kbs     1534 kbs
Max User Rate     31920 kbs     8909 kbs
Noise Margin     21.8 dB     25.9 dB
Attenuation     20.8 dB     19.7 dB
Output Power     13.1 dBm     7.5 dBm

Protocol     G.993.2_8d     
Channel     Interleaved     
DSLAM Vendor Information     Country Vendor Specific
{41971 }
Rate Cap     31731 kbs     
Attenuation @ 300kHz     11.7 dB     
VCXO Frequency Offset     21.0 ppm     Ok
Excessive Impulse Noise     1     Interleaved mode recommended

-----------------

What is Max User Rate vs. User Rate?  And how come when I play with
any of these numbers (I'm probably not doing it right) I don't come
out any of the published AT&T speed tiers (which start at 6Gb and are
in 6Gb increments from there upwards).

A speed test shows I'm getting about 8Gb up.

TIA,

-sw

Re: Translating U-Verse Speed
On Mon, 17 Nov 2014 14:42:17 -0600, Sqwertz wrote:

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Errrr.  I mean Mbps, not Gbps.  But you probably already knew that.

-sw

Re: Translating U-Verse Speed
wrote:


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That's the highest speed your modem can do and still maintain
a resonable BER (bit error rate).

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That's what the line is capable of doing, if you pay AT&T enough.

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That's your signal to noise ratio.  Bigger is better.
<http://www.dslreports.com/faq/16220

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That's your signal loss between the AT&T DSLAM and your modem.
Smaller is better.

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That's line drive (tx) level in both directions.  Smaller is better.

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That's the most that AT&T will allow (rate cap).

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Max user rate is best you could do as limited by hardware under  
perfect conditions.  User rate is the best you can do considering
line conditions and BER (bit error rate).

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Speed tiers are for marketing.  The number you see here are a tangled
mess which includes IP-DSL overhead, retransmissions, lost packets,
etc.

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Yep.  8909 kbit/sec if your speed test had that level of resolution.

--  
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558

Re: Translating U-Verse Speed
On Tue, 18 Nov 2014 00:13:50 -0800, Jeff Liebermann wrote:

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Thanks for the explanation.  When I had regular AT&T DSL the rates in
the modem config were as published for that speed tier.

So 13215 and 31920 are not supposed to translate into numbers
proportionate to your actual speed tier?

Anyway - I'm not complaining.  I'm paying $15/month for 8Kbps which is
almost twice as much as I was getting for $51/month.  Hopefully when
that 12-month contract is up Google Fiber will be ready here.  

-sw

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