whosmatt
join:2005-02-28
Raleigh, NC
| [Line Problem] Random disconnects - seemingly related to uploadi
For the past few days, I've been experiencing brief disconnects with loss of sync. It's been sporadic, but I've been able to reproduce it by initiating a sustained upload (FTP or seeding torrent, for example). It will generally fail within 90 minutes of beginning the outgoing transfer.
I have a Motorola 2210-02 modem, but I have tried with one of my old Arescom NetDSL 800 modems and get the same results. I have had a tech in my house, he switched me to a different port @ the DSLAM (or something to that effect), After he did that, my service was perfect for about 20 hours before resuming the disconnects.
I called again today and all they could think to do was put a noise profile on my line.
I have a home run to my modem that has a single splice using a terminal block. Could that be the problem? The tech remarked that the copper coming from the NID into the crawl space was heavier than what is in use now, but the signal measured at my jack is identical (according to him) to that measured at the NID.
I'm not sure where else to turn. I need to FTP large files overnight sometimes and this is making it nearly impossible. |
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whosmatt
join:2005-02-28
Raleigh, NC
1 edit | Re: [Line Problem] Random disconnects - seemingly related to upl
Well, more info -- after my first call yesterday I was up again for a couple of hours and down when I got home from work. I was able again to observe the momentary lack of sync. I called AT&T yet again and all they can think to do is send out another tech. In a last ditch attempt, I pulled out my 2nd Arescom modem (yes, i have two of these behemoths) and plugged it in. After waiting for what seemed like an interminable amount of time and pulling the phone cord out a few times, it finally synced and has been that way for the past 13 + hours. It has endured a ~3GB torrent (up and down) and 700 MB of FTP uploads overnight and has stayed up.
I would get my hopes up, except this is exactly what happened after the tech was here on Sunday. I got about 20 hours out of that before the disconnects started again.
At this point I'm left scratching my head. My reasons for not switching to Road Runner (it's both cheaper AND faster) are looking pretty thin. I mean, who cares if they call it "High speed Online?" ("no, sir. I don't think you understand. what I want is the INTERNET, not ONLINE") |
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Airwolf7
Premium
join:2004-12-12
Franklin, KY
 ·AT&T Southeast
2 edits | reply to whosmatt
How do I check modem statistics, synch rates & speeds at the NID? (Residential Housing)
How do I check modem statistics, synch rates & speeds at the INI? (Residential Apartment)
How do I check modem stats & event logs? What do the numbers mean?
Motorola 2210-02-1006 DSL Statistics Page
Refer to the black box below. Telnet into your modem at 192.168.1.254 and issue the command show summary then issue the command show dsl. Look at the Uptime and the ADSL Startup Attempts as this will tell how many times the modem has lost sync over a period of time. If the modem has lost sync 3 time in 30 days then no big deal, If it has lost sync 3 times in an hour then you have problems that need to be troubleshooted.
I am loosing synch. How do I troubleshoot and correct the problem?
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whosmatt
join:2005-02-28
Raleigh, NC
1 edit | reply to whosmatt
I run in bridged mode. Here's an excerpt of my linux router's log file:
The last three entries are from when I switched to the Arescom yesterday and it took a while to sync. Fingers crossed. It has been up since.
Does the Motorola keep any stats while in bridged mode? And more importantly, are they retained at power-off?
Edit: My stats, as measured at the NID and at my jack inside are impeccable, according to the tech who visited me. I also did run the Motorola in its default mode for a while while troubleshooting with tech support and it reported nothing to indicate a line problem, though I watched it lose sync during this time as well. |
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FAQFixer
Premium
join:2004-06-28
Powder Springs, GA | If you have great stats but still loss synch intermitently I would check/replace the splitter/filter. |
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whosmatt
join:2005-02-28
Raleigh, NC
| said by FAQFixer  :If you have great stats but still loss synch intermitently I would check/replace the splitter/filter. There is no splitter nor is there a filter. I have no voice service on the line, and a home run to a dual jack with only the dsl modem plugged in. All other wiring is disconnected @ the NID. |
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Airwolf7
Premium
join:2004-12-12
Franklin, KY
·AT&T Southeast
| reply to whosmatt
I reset my modem and configured it for "Bridged Ethernet" mode.
I assigned my network adapter an IP address of 192.168.1.1 and a Netmask of 255.255.255.0
I then configured Windows Vista for my FastAccess DSL connection using the built-in PPPoE client.
WAN is Ethernet Bridge
I can access the modem's Web GUI and can telnet into the modem's shell.
DSL Statistics - Bridged Ethernet
said by whosmatt :I run in bridged mode. Does the Motorola keep any stats while in bridged mode? And more importantly, are they retained at power-off? Yes it keeps stats while in "Bridegd" mode.
No it does not retain them after it has been powered off.
said by whosmatt :Edit: My stats, as measured at the NID and at my jack inside are impeccable, according to the tech who visited me. I also did run the Motorola in its default mode for a while while troubleshooting with tech support and it reported nothing to indicate a line problem, though I watched it lose sync during this time as well. Lets see them impeccable stats.
said by whosmatt :I have no voice service on the line, and a home run to a dual jack with only the dsl modem plugged in. All other wiring is disconnected @ the NID. Do not power down or reset your modem. Connect your modem directly to one of your computers and assign that computer an IP address of 192.168.1.1 with a Netmask of 255.255.255.0 and take a reading of your DSL Statistics as connected now.
Humor us anyway and connect your modem directly to the "Test Jack" in the NID with the phone cable that came with the modem and take a reading of your DSL Statistics again.
--
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"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote!"
"Those who beat swords into plowshares usually end up plowing for those who don't."
Quotes by Benjamin Franklin. |
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whosmatt
join:2005-02-28
Raleigh, NC | Ok, i will do that when I get home. It's looking good right now, though. The old Arescom is holding steady; currently up for 21:32 and counting. I'm kind of reluctant to shut it down. |
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whosmatt
join:2005-02-28
Raleigh, NC
| reply to Airwolf7
Ok here are my stats at the jack:
and at the NID:
These are different now that they put a noise profile on. FWIW the other modem had kept sync for ~24 hrs before I pulled it to test this one. |
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kremithefrog
join:2008-06-27
Albany, GA
·AT&T Southeast
| Those aren't great stats really. The upstream noise margin is OK but sometimes during the day it could drop for various reasons and cause your problem. You're on an interleaved profile which isn't usually good. Mainly used to make connections that aren't all that good be stable. |
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Airwolf7
Premium
join:2004-12-12
Franklin, KY
·AT&T Southeast
1 edit | reply to whosmatt
whosmatt I had a reply for you. I took a little nap and when I awoke I wanted a pizza. While the pizza was in the oven cooking I came back to the computer and decided to close a bunch of unused tabs. I got trigger happy on the mouse and took out a bunch of bad guys and one civilian. The reply I had for you was the civilian that perished due to collateral damage.
I'm going to eat my pizza and do a few things then I will come back and recreate my original reply by editing it into this reply.
Sorry.
Maybe FAQFixer will come back and help us. ADSL2+ stat reading is not my strong suite because I don't have much exposure to it and your line being Interleaved hard makes it even worse for me to read because Interleaving covers up things that make it easier for me to read. Plus Interleaving acts a little bit different on the ADSL2+ than it does on the G.DMT.
Some people that aren't regulars here might think that I work for AT&T because I answer a lot of questions here. I don't work for AT&T. I'm just a little guy that helps people in his home town a lot with their FastAccess problems and likes to try to help people here to. I don't know everything, but I'm learning more as I go.
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Your stats on the surface appear OK, but under the Interleaving band-aid I think that there is more than mets the eye.
I would not exactly call those stats "impeccable".
Better than a sharp poke in the eye, but not "impeccable".
Impeccable stats would be closer to something like this.
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EDIT: After eating that pizza I got some killer heartburn and a headache. I'm going to take me something for that and rest for awhile. I got me a PC Power & Cooling power supply and a nVidia video card and I think after I get through resting I'm going to install them and play games for awhile.
I'm going to call it goodnight for the forum now. See you tomorrow. |
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whosmatt
join:2005-02-28
Raleigh, NC
1 edit | Just to be clear, the interleaving was a troubleshooting step that did nothing to help the problem. I'm beginning to think that the modem is bad.
When I first moved into this location, I was using one of the Arescom modems, as I had for years in my previous location (they were left over from my stint as a Mindspring customer). I can't be sure which one of the two I was using, but I generally favored the one without USB, as it has more status lights on the front. When I moved here, my modem would drop sync maybe once every 8-12 hours-- just enough to be annoying. I never tried the other Arescom at this point. I called AT&T and the tech came out and and took one look at the modem and gave me the Motorola. My connection was good after that; it would stay up for a month at a time. I began noticing shorter connection uptimes a few weeks ago but it wasn't too bad and wasn't causing me problems. This particular problem just started last Friday.
I tried the Arescom modem that I had used previously and it dropped sync as well, but it is, after all, an 8 year old piece of equipment. It could certainly be faulty.
The one I'm using now hasn't dropped sync since I put it in service yesterday afternoon.
And as for the "impeccable" line stats, I was quoting the tech (the same one who was out here in February and who gave me the Motorola modem - he liked me so much he came back) who was measuring with his tester, not my modem. He gave me the figure 43% which didn't sound good so he clarified that it was very good, the 43% referring to the percentage of my potential line speed that 6Mbps service was consuming.
Anyway-- I'm an IT guy but not a telecom tech, so I'll let the pros figure it out, but if my connection stays stable with the modem I'm currently using, I'm inclined to think that I'm a victim of bad hardware. Maybe I'll call support and have them remove the interleaving tomorrow.
Thanks for all the help. |
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whosmatt
join:2005-02-28
Raleigh, NC
| reply to whosmatt
Called ATT today and got them to remove the interleaving. I can't view the stats of the old Arescom modem, but the line tech apparently could and said they seemed fine. Long and short is that they are overnighting me a new modem.
Fingers crossed.
-M |
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whosmatt
join:2005-02-28
Raleigh, NC | New modem in today -- but I've been up 50 hrs and counting. I think I'll see how long i can go before i unbox the new one. Again, thanks to everyone for their help. |
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whosmatt
join:2005-02-28
Raleigh, NC
| reply to whosmatt
Well, fast-forward through the weekend and the problems are back. Hooked up my brand-new modem and my upstream S/N margin is sitting at around 7db and I'm still interleaved. Plugging directly into the NID does nothing to help the stats. Call again, get put through "you need to be on the highest noise profile" wringer again and my S/N increases to 9 (bascially the same stats as you see a few posts above). This did nothing to help the sync dropping during uploads before, and I have no reason to believe it will help this time. Tech is scheduled to come out tomorrow afternoon. I will be at work, but my wife will be home. What can I tell the tech to get this fixed properly or am I stuck with unreliable service?
Again my service at this address has been reliable in the past. Not sure what has changed. I don't know what my stats looked like during my 30 day plus uptimes since I had no reason to check. Advice appreciated. My other choice is Roadrunner. I can get 10Mbps service for $2 less than I'm paying AT&T now. |
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whosmatt
join:2005-02-28
Raleigh, NC
2 edits | reply to whosmatt
One more update -- Tech shows up @ 5:30 for his 1-5 window and is extremely apologetic and very helpful. He checks my line stats and declares (like the last tech) that I shouldn't need a noise profile. He removes it, and here are my stats at the jack:
Better.... we'll see. Thoughts?
edit:
I also made it so that I can access my modem's shell without plugging into the PC. If you have a linux based router this should work. I use Tomato; instructions are for dd-wrt. I have to ssh into the router and telnet from there but it's just a few extra keystrokes compared to crawling around and unplugging things:
»www.dd-wrt.com/wiki/index.php/Ac···guration |
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whosmatt
join:2005-02-28
Raleigh, NC
1 edit | reply to whosmatt
I hate to resurrect this topic, but I'm STILL having problems.
I have been through 5 tech visits, two brand new modems, a brand-new homerun using cat5, a new jack installed by the tech, and two port changes on the DSLAM. My connection will be stable for a couple of days and then my SNR margin will drop by 4-6 db (or more -- I have actually seen negative numbers!) and I'll start getting CRC errors. If it gets really bad I'll lose synch. By the time the tech shows up, it'll be working fine again.
The only reason I haven't already given up is that the tech gave me his card and cell phone number, so I just call him directly whenever I'm having trouble.
He said after the last visit that he thinks something is wrong with the remote equipment and that i'm the only one who notices because i am a more observant (for lack of a better word) user.
So -- I'm on the DSLAM located at the corner of Glascock and King Charles in ZIP 27610. If by the slimmest chance anyone reading the post is on the same equipment, can you keep an eye on your stats for me and see if we can correlate problems?
Thanks,
Matt |
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