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| [Speed Problem] DSL 3.0Mbps gives 1.5Mbps speeds, even after modDear all,
First of all, thanks to all the regulars in the forum and to the people who came back to report on their stories, it's been really helpful to go through all your replies to inform myself :) (keep it up! ;) )
Short story:
- I just noticed I've been paying for 3.0Mbps DSL since 2008 and getting less than 1.5Mbps DSL speeds, never had connection drop outs or other issues.
- ftp transfers always gave ~140KBps, ~1.04Mbps at »www.att.com/speedtest/, 1344kbps at DSL modem log
- Contact AT&T, says they "detect problems with the line" in their remote readings, will send technician.
- Technician comes, plugs his device, gets 2.2Mbps outside and inside my apartment, doesn't even look at any of the modem SNR/ATTN readings, suggests replacing modem (and paying for checkout :( ).
- Buy new modem (TP-LINK TD-8817) but rate is still low, 1.40Mbps at speedtest, 1600kbps at DSL modem log
- Reconnecting old modem, now gives ~1.10Mbps at »www.att.com/speedtest/.
- SNR readings look fine, but line attenuation is high (56-60)
In summary, rate is still low for 3.0Mbps,
Any ideas?
Contact the direct forum?
Should I be able to see rate negotiation all the way from 3Mbps to 1300Kbps in the Speedstream log? because I only see this 1216 and 1344:
+000 days 00:00:00 E |System |=============== SYSTEM UP ===============
+000 days 00:00:00 E |System |Current Mode: PPP on the modem (Public IP for LAN device)
+000 days 00:00:00 E |DSL |DataPump Version - 01.01.00.00
+000 days 00:00:00 E |DSL |State: WAITING
+000 days 00:00:02 E |Ethernet |Link 1 Up - 100Base-TX Full Duplex
+000 days 00:00:02 E |DSL |State: INITIALIZING
+000 days 00:00:10 E |DSL |HYBRID 1
+000 days 00:00:10 E |DSL |Link up 1 US 512 DS 1216 (INTL:G.dmt)
+000 days 00:00:14 E |DSL |Link Down
+000 days 00:00:14 E |DSL |State: WAITING
+000 days 00:00:16 E |DSL |State: INITIALIZING
+000 days 00:00:24 E |DSL |HYBRID 1
+000 days 00:00:24 E |DSL |Link up 2 US 512 DS 1344 (INTL:G.dmt)
+000 days 00:00:32 E |PPPoE |tx PADI, id: 0000, ac: (NULL), sn: (NULL)
+000 days 00:02:08 E |PPPoE |Last PPPoE message repeated 11 times.
+000 days 00:02:08 E |PPPoE |rx AC Name: bras17.pltnca
+000 days 00:02:08 E |PPPoE |tx PADR, id: 0000, ac: (NULL), sn: (NULL)
+000 days 00:02:08 E |PPPoE |rx PADS id: 1649
+000 days 00:02:08 E |PPP |LCP neg PAP
+000 days 00:02:08 E |PPP |LCP up
+000 days 00:02:08 E |PPP |IPCP nak option: 3
+000 days 00:02:08 E |PPP |IPCP nak option: 129
+000 days 00:02:08 E |PPP |IPCP nak option: 131
+000 days 00:02:08 E |PPP |IPCP up ip: 71.132.199.193, gw: 151.164.184.74, dns: 68.94.156.1, 68.94.157.1
+000 days 00:03:28 E |SNTP Client |server 132.163.4.102 (Primary) timeout
Unfortunately, the TP-LINK log doesn't have the negotiation, it only contains
11/30/2011 23:49:11> netMakeChannDial: err=-3000 rn_p=804cc5b0
11/30/2011 23:49:19> Last errorlog repeat 5 Times
11/30/2011 23:49:33> netMakeChannDial: err=-3000 rn_p=804cc5b0
11/30/2011 23:49:38> Last errorlog repeat 12 Times
11/30/2011 23:49:38> Call Failed
11/30/2011 23:49:48> netMakeChannDial: err=-3000 rn_p=804cc5b0
11/30/2011 23:49:56> Last errorlog repeat 2 Times
11/30/2011 23:50:8> Call Failed
11/30/2011 23:50:19> netMakeChannDial: err=-3000 rn_p=804cc5b0
11/30/2011 23:50:20> Last errorlog repeat 2 Times
11/30/2011 23:50:38> Call Failed
11/30/2011 23:50:50> netMakeChannDial: err=-3000 rn_p=804cc5b0
Thanks for reading!
Long story:
1) Which AT&T DSL Package do you have –
Pro (3.0Mbps down)
2) Which modem brand and model do you have?
Speedstream 4100
TP-LINK TD-8817
3) Are you using a router? If so, provide the brand and model.
Yes, TP-LINK TL-WR740N, but I get the same effects with and without router.
I also get the same effects from:
- my laptop connected wired to the DSL modem.
- my laptop connected wired to the router or modem or wirelessly to the router
- my Linux NAS wired to the router.
4) Is your PPPoE login info (username & password) entered in the modem, in your router or do you use PPPoE software?
Tried both, same results. It's normally entered on the modem.
5) Describe the lights on the modem when the trouble occurs.
SpeedStream 4100: All lights green, activity blinks green.
TP-LINK TD-8817: All lights green, USB off, blinking green LAN and INTERNET
6) Confirm that you’ve checked to ensure that ALL devices plugged into the wall jacks serviced by your DSL phone number (except the DSL modem) have filters fitted.
There are no devices plugged other than the DSL modem.
7) Confirm that you’ve powered off the modem and started it again and whether or not that made any changes with your problem.
Yes, several times for two days. Only marginal differences, DLS modem log readings of 1500Kbps to 1700Kbps on the TD-8817, 1344Kbps to 1500Kbps on the SpeedStream
8) Do you hear any type of noise on the DSL phone line or any other unusual telephone symptoms?
No.
9) Provide line stats as follows…
a) From Speedstream 5100b, 4100, 4100b -- Go to this address with your browser – »192.168.0.1/statistics.htm and copy/paste the contents of the first two tables into your post
Line State UP
Modulation ANSI
Data Path interleaved
Max Allowed Speed (kbps) 1344 512
SN Margin (dB) 11.0 -
Line Attenuation (dB) 57.0 -
Loss of Signal 0 -
Loss of Frame 0 0
CRC Errors 2 2
From TP-LINK TD-8817
ADSL Firmware Version: FwVer:3.11.2.175_TC3086 HwVer:T14.F7_6.0
Line State: Showtime
Modulation: G.DMT
Annex Mode: ANNEX_A
Downstream Upstream
SNR Margin: 13.0 14.0 db
Line Attenuation: 63.5 31.5 db
Data Rate: 1696 512 kbps
Max Rate: 1632 944 kbps
POWER: 18.0 12.0 dbm
CRC: 0 0
10) If you have a speed problem, use the AT&T Speed Test here -- »helpme.att.net/dsl/speedtest/ and post your results.
3/31/10 -- While the AT&T Speed Test site is undergoing renovations, try this site -- »www.speedtest.net
1.10Mbps with the Speed stream
1.39Mbps with the TP-LINK | |
 d_lBarsoomPremium,MVM
join:2002-12-08
Reno, NV
kudos:7 | Re: [Speed Problem] DSL 3.0Mbps gives 1.5Mbps speeds, even after This is an easy problem to diagnose. Your attenuation is flat out too high for full Pro DL speeds. On the 4100, it is almost too high for 1536 speeds and is training down.
The Speedstream says your inside wiring is pretty good at hybrid 1: »SBC DSL FAQ »What do the hybrid numbers mean and what do they tell you about your line? , but you should check the stats at your NID just the same: »AT&T Southeast Forum FAQ »How to check modem stats, synch rates & speeds from test jack at the NID. You need to get the DL attenuation to closer to 50.0 dB to be able to have full Pro speeds.
If you can't get fulll Pro speeds, you have a choice: you can keep paying for Pro and enjoy the faster upload speeds or make arrangements in AT&T Direct: » AT&T Direct to slow down to Express and pay the cheaper prices.
--
TCE Weather | |
| Thanks d_l,
said by d_l:but you should check the stats at your NID just the same
It's an apartment complex and I don't have access to the NID. The technician said he was getting 2.2Mbps readings from outside anyway.
The weird part is that the technician also said that he was able to get 2.2Mbps with his reading device from the same socket the DSL modem is plugged to, go figure.
I'll check with the AT&T Direct guys and report back with any advances.
Thanks again! | |
d_lBarsoomPremium,MVM
join:2002-12-08
Reno, NV
kudos:7 | reply to wildfred
Do you have multiple phone jacks available in your apt? Sometimes a switch of phone jacks that the DSL modem is connected to pays big speed dividends.
You said no other devices are plugged in besides the modem. Is this dry DSL? If it is, you shouldn't be using a microfilter. Removal of microfilters on dry DSL can help lower attenuation in some cases.
--
TCE Weather | |
| said by d_l:Sometimes a switch of phone jacks that the DSL modem is connected to pays big speed dividends.
I'll give that a try, but I don't think the apartment is big enough to make any difference  . I'll also try to find the INI as per the suggestions at »AT&T Southeast Forum FAQ »How to check modem stats, synch rates & speeds from test jack at the INI.
said by d_l:You said no other devices are plugged in besides the modem. Is this dry DSL? If it is, you shouldn't be using a microfilter.
It's not dry DSL, I do have a phone that I connect to a microfilter when I need to use it, but I already disconnected both phone and microfilter to prevent any attenuation. | |
d_lBarsoomPremium,MVM
join:2002-12-08
Reno, NV
kudos:7 | reply to wildfred
Other things you can try:
Some people in apts. have disassembled their phone jacks and tightened and cleaned corrosion off the connections.
You didn't list where you are located, but if there is any chance your phone lines are wet due to rain, then you might try taking your phone off hook (or even dialing a number) for a while, then rebooting the modem, and checking the attenuation level. If it drops, that would indicate you have damp/wet splices with oxidation. The off-hook and ringing voltage can sometimes burn through the oxidation temporarily. This info would be useful to any techs working to repair your line.
--
TCE Weather | |
| I found the INI (it's inside a metallic locker, which acts as a concentrator for the phone, cable and network wires) and the speed is quite lower, around 1200kbps with the SpeedStream. The socket at the INI looks a bit rusty, which could account for that, or it could be time of the day (evening).
I also tried a different socket of the apartment and I got same speed as in my usual one ~1600Kbps
So at this point I'll wait for the AT&T direct guys to drop me a line. | |
| [SOLVED]3 days after posting on the AT&T direct forum, David from AT&T support replied, and fixed it a few hours later. In his own words:
said by David :
It was on the more heavy db12 profile, I moved it to the db6. This line is 13,000ft from the office it's terminated to and probably as good as it will get. Pro full speed is only guaranteed full speed at or less than 9,000ft from the office. Past 9,000ft it's a best effort service at that point.
...
The mid profile (9db) would lower your max rate. the 6db is considered the much better (higher speed) profile. THe one you were on before the change the 12db profile was a max noise profile which lowers max speeds. So with this 6db profile I gave you a higher speed at the cost of 6db off the noise margin. 9db would lower your max to say 1800-2000 but make the noise margin at 9db. If it is stable here, I am going to say don't worry about it. However you will need to tell me if it is unstable accordingly
As you can see, not only he fixed the issue, but he really does care and goes a great length to explain what the problem is, which I really appreciate. He also made sure someone from accounting called me back, where they reimbursed me the extra modem I bought, and took a month off my bill for all the trouble.
I've been running on that higher noise tolerance profile for a week and, although the DSL modem registers a few CRC errors (currently it's at 66 after several days), the connection speed is much improved and I haven't got connection drops or anything, so the CRC errors are unnoticeable.
I'm getting much better numbers (240KBps transfers,m 1.90Mbps at speedtest):
TP-LINK modem
Downstream Upstream
SNR Margin: 5.0 14.0 db
Line Attenuation: 63.5 31.5 db
Data Rate: 2336 512 kbps
Max Rate: 2560 944 kbps
POWER: 17.5 12.0 dbm
CRC: 66 1
SpeedStream modem
To Modem To Internet
Max Allowed Speed (kbps) 2112 512
SN Margin (dB) 6.0 -
Line Attenuation (dB) 57.0 -
Loss of Signal 0 -
Loss of Frame 0 0
CRC Errors 2 2
Hats off to David at the AT&T direct forum and to Kevin at AT&T accounting for the great service :) | |
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