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ckchen
join:2011-07-19
Sunnyvale, CA | [Speed Problem] 6M/768K DSL only get 1M download speed during ni After I upgrade my 3M/384K to 6M/768K direct DSL service, the internet speed is very unstable, usually during night time. Not only the download speed is only around 1M, the response time while browsing is very slow. Before upgrading, there was no such issue.
1) Which AT&T DSL Package do you have –
Elite (6.0Mbps down)
2) Which modem brand and model do you have?
2WIRE 2701HG-B
3) Are you using a router? If so, provide the brand and model.
NO.
4) Is your PPPoE login info (username & password) entered in the modem, in your router or do you use PPPoE software?
In modem.
5) Describe the lights on the modem when the trouble occurs.
As usual, POWER, DSL and INTERNET green lights are active.
Ethernet is blinking.
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.
I don't have a phone.
7) Confirm that you’ve powered off the modem and started it again and whether or not that made any changes with your problem.
Tried several times. Never helps.
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…
b)
DSL Down Up
Current Rate: 6016 kbs 768 kbs
Max Rate: 11408 kbs 1156 kbs
Current Connection:
Current Noise Margin: 17.0 dB 19.0 dB
Current Attenuation: 25.2 dB 10.5 dB
Current Output Power: 8.9 dBm 11.9 dBm
ATM Cells Errors %
Transmit: 1780348 0 0
Receive: 9876785 0 0
IP Bytes Packets Errors %
Transmit: 68812008 438459 0 0
Receive: 457487868 497819 0 0
10) The speed test result varies by time. Now:
ping: 173 ms, DL: 1.26Mbps, UL: 0.53Mbps.
The ping time usually is around 400 ms during night time, and DL speed is around 1.0Mbps. UL is quite stable, 0.5~0.6Mbps even when the DL speed is normal (3~5Mbps). | | |
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 NormanSPremium,MVM
join:2001-02-14
San Jose, CA
kudos:9
 ·SONIC.NET
·Pacific Bell - SBC
1 edit | Re: [Speed Problem] 6M/768K DSL only get 1M download speed durin said by ckchen:10) The speed test result varies by time. Now:
ping: 173 ms, DL: 1.26Mbps, UL: 0.53Mbps.
The ping time usually is around 400 ms during night time, and DL speed is around 1.0Mbps. UL is quite stable, 0.5~0.6Mbps even when the DL speed is normal (3~5Mbps).
Based only on these numbers, I'd suspect a FUBAR profile. However, the "nightly slows" sounds more like an "exhausted" aggregation router. Both are very real problems, so it would help to sort things out by knowing if you ever actually get close to your profile speed. Download should max out at about 5.1 mb/s when things are going well.
This link explains how to test for an exhausted router by using a packet capture program ("packet sniffer"). If your graph matches the pattern for exhausted router, your only hope is that there is a less congested aggregation router available at your POP center; and your only recourse would be to request a change through the AT&T Direct forum (but be sure you can prove congestion).
Arrggghhh. I shouldn't post when I am bone tired. OP found the information I meant to include; but, for the sake of completeness, I am editing to add the missing link:
»SBC DSL FAQ »How to measure throughput speeds on individual packets?
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Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum | |
ckchen
join:2011-07-19
Sunnyvale, CA | said by NormanS:said by ckchen:10) The speed test result varies by time. Now:
ping: 173 ms, DL: 1.26Mbps, UL: 0.53Mbps.
The ping time usually is around 400 ms during night time, and DL speed is around 1.0Mbps. UL is quite stable, 0.5~0.6Mbps even when the DL speed is normal (3~5Mbps).
Based only on these numbers, I'd suspect a FUBAR profile. However, the "nightly slows" sounds more like an "exhausted" aggregation router. Both are very real problems, so it would help to sort things out by knowing if you ever actually get close to your profile speed. Download should max out at about 5.1 mb/s when things are going well. This link explains how to test for an exhausted router by using a packet capture program ("packet sniffer"). If your graph matches the pattern for exhausted router, your only hope is that there is a less congested aggregation router available at your POP center; and your only recourse would be to request a change through the AT&T Direct forum (but be sure you can prove congestion). I got 5.1M once in the mid-night about one week ago.
I didn't see any link in the post so I did some search and then used Wireshark to generate the packet throughput pattern. Is this the exhausted aggregation router issue? | |
 d_lBarsoomPremium,MVM
join:2002-12-08
Reno, NV
kudos:7 | said by ckchen:Is this the exhausted aggregation router issue?
Probably. Your chart shows short periods of time when the packet speeds jump up and down around rapidly typical of most exhausted router performances, but there are other periods when they are "stable" at a sub-normal speed. It is a guess that charts with more "stable" slowed down speeds may indicate a more thoroughly exhausted router condition.
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