kaila
join:2000-10-11
Lincolnshire, IL
clubs: 
| Uneven attenuation
I've got a problem where attenuation is double on the downstream side. A very poor 63dB down compared with 31dB up (measured through the Motorola 2210 modem). This is a new DSL order, installed last Friday, and is connected through one of the relatively new VRADs that ATT has installed around my town. It's the basic package for now, and the modem also says that it's currently tuned to 224/128. SNR isn't stellar either, currently 12dB down and 19dB up. As you can imagine, CRC error rates are high, although amazingly it seems to hold sync most of the time.
I've tested at the NID, swapped cables, etc, so it's definitely an issue outside my house. Are differences in attenuation like this common, or an indication of anything? More importantly, can something like this be remedied. I'd really like to upgrade to express, but see it as an impossibility right now. |
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wayjac
Premium
join:2001-12-22
Indy | Can you post lines 140 thru 148 of the technician readout page? |
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kaila
join:2000-10-11
Lincolnshire, IL
clubs:
| Thanks for taking a look, here you go....
Rx Tx
140 Current Rate 224 128
141 Previous Rate 0 0
142 DSL Max Rate - -
143 DSL Min Rate - -
144 Current ATTN DR 384 864
145 Current SNRM 12.0 19.0
146 Current LATN 63.0 31.0
147 Current SATN - -
148 Current TP 12.2 0.0 |
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wayjac
Premium
join:2001-12-22
Indy | reply to kaila
Upload stats almost always look good
63dB line attenuation means you're at the limit for dsl
Line 144 shows the maxium up/down sync rates for your dsl line
Do you get the same stats with the modem connected at the nid. |
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kaila
join:2000-10-11
Lincolnshire, IL
clubs:
| said by wayjac  :...Do you get the same stats with the modem connected at the nid. Yes, exactly the same in fact. Any chance Direct can shed some light on this and possibly tell me which VRAD I'm connected to, or distance? I assume it's through a VRAD, but if I'm at the limit, I wonder if I'm connected at the CO the next town over in Deerfield IL. A DSL tech I spoke with on the phone 'didn't have that information'.
Lincolnshire has pushed for years to get DSL and the last they heard from ATT was 2012. We're a small suburban village, and in all honesty, Comcast has probably saturated the broadband market here so we're probably not on AT&T's priority list. Supposedly Sprint's WiMax plans speeded things up and we had VRADs installed this past fall. I wonder now if those are available yet. |
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gdm
Premium,MVM
join:2001-06-15
Mchenry, IL
clubs:
 ·AT&T U-Verse
 ·AT&T CallVantage
·Comcast Digital Vo..
 ·Comcast
| VRAD is for U-Verse service which is VDSL you have ADSL.
If you aren't served by a CO then it's a RT = Remote Terminal.
I would go to the ATT Direct forum and have them look at the line. Could be a open wire and since it's raining that could be causing your issue.
If this is a line share DSL do you hear any static on the phone when you pick it up? |
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kaila
join:2000-10-11
Lincolnshire, IL
clubs:
| Sorry if there is any confusion. Whether it's RT's or VRAD's, what has been installed in Lincolnshire does look like some VRAD pictures I have seen. DSL has never been available to my address before the last time I checked a couple weeks ago, and I just assumed the new infrastructure had been lit. Now I wonder.
It is lineshare, and I do get occasional static and a constant but low level hum on the POTS line. I'm one of those crazy asterisk guys, but I did check with an analog phone connected directly and got the same result. The stats I've been pulling have been the same all weekend long so I don't think the rain is playing into this. |
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wayjac
Premium
join:2001-12-22
Indy | reply to kaila
A post in the direct forum may shed some light, you should be able to find out what your loop lenght is.
What type of equipment you're connected to.
What upgrade options there are if any. |
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gdm
Premium,MVM
join:2001-06-15
Mchenry, IL
clubs:
·AT&T U-Verse
·AT&T CallVantage
·Comcast Digital Vo..
·Comcast
| reply to kaila
VRAD's and RT's can look similar and a VRAD maybe going up but you are on a RT for sure.
If you are getting a hum and some static my bet is a problem from the RT to your location.
You could post in ATT Direct as wayjac suggested. Another option is to call POTS repair and report that hum/static but don't mention DSL at all. |
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nwrickert
sand groper
Premium,MVM
join:2004-09-04
Geneva, IL
 ·AT&T Midwest
| reply to kaila
A very poor 63dB down compared with 31dB up (measured through the Motorola 2210 modem). I am currently seeing a downstream attenuation of 52, and upstream of 32 (different modem so not exactly comparable).
It is normal for downstream attenuation to be significantly higher than upstream. However, the 63db downstream is a bit high, and might make your connection unreliable.
The upstream and downstream data use different parts of the spectrum (frequency range), and attenuation is higher on the part used for downstream. However, the bandwidth is also higher because a wider range of frequencies is available for the downstream data.
--
AT&T dsl; Westell 327w modem/router; openSuSE 11.0; firefox 3.0.1 |
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kaila
join:2000-10-11
Lincolnshire, IL
clubs:
| Ahh, thanks for the explanation. My though originally was attenuation rates should be the roughly the same up and down (all things equal). Which is too bad, because that would seem to give more credence to me being at the limit.
I posted in the direct forum. Thanks everyone! |
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