Translating U-Verse Speed

Discussion in 'Wireless Internet' started by Sqwertz, Nov 17, 2014.

  1. Sqwertz

    Sqwertz Guest

    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


    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 {46336} Vendor {BDCM} 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.


    Sqwertz, Nov 17, 2014
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  2. Sqwertz

    Sqwertz Guest

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

    Sqwertz, Nov 18, 2014
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  3. That's the highest speed your modem can do and still maintain
    a resonable BER (bit error rate).
    That's what the line is capable of doing, if you pay AT&T enough.
    That's your signal to noise ratio. Bigger is better.
    That's your signal loss between the AT&T DSLAM and your modem.
    Smaller is better.
    That's line drive (tx) level in both directions. Smaller is better.
    That's the most that AT&T will allow (rate cap).
    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).
    Speed tiers are for marketing. The number you see here are a tangled
    mess which includes IP-DSL overhead, retransmissions, lost packets,
    Yep. 8909 kbit/sec if your speed test had that level of resolution.
    Jeff Liebermann, Nov 18, 2014
  4. Sqwertz

    Sqwertz Guest

    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.

    Sqwertz, Nov 18, 2014
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