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Stuttering Connection

N/A

Stuttering Connection

I have been experiencing problems with my ADSL connection ever since it was activated before Christmas. BT have been out and replaced a card at the exchange but I'm still experiencing problems. I have problems attempting to connect to websites, the attempt will time out until eventually connecting on a subsequent attempt. Once an initial connection has been made I can generally access the website.

I've grabbed some information from my Zoom 5510-7200A modem but can't interpret the figures to determine if the point to a problem:

ADSL Status
Item Status
Showtime Firmware Version: 3.24
Line State: SHOWTIME
Modulation: G.dmt
Annex Mode: ANNEX_A
Startup Attempts: 1
Max Tx Power: -38 dBm/Hz
CO Vendor: TEXAS_INSTRUMENTS
Elaspsed Time: 0 days 0 hours 36 minutes 53 seconds

Item Downstream Upstream
SNR Margin 30.1 27.0 dB
Line Attenuation 54.9 30.5 dB
Errored Seconds 4 4
Loss of Signal 0 0
Loss of Frame 0 0
CRC Errors 4 8
Data Rate 576 288 kbps
Latency FAST FAST

The modem log shows problems with the PPP connection:

1/1/1970 0:0:0> ATM: Detected
1/1/1970 0:0:0> ATM: Setting up vcc0, VPI=0, VCI=38
1/1/1970 0:0:0> CfgMgr: 'Shtm.dlz' module loaded.
1/1/1970 0:0:11> ATM Connected
1/1/1970 0:0:11> ATM layer is up, cell delineation achieved
1/1/1970 0:0:11> ADSL connected
1/1/1970 0:0:11> PPP1 PPPoA Connected
1/1/1970 0:0:18> PPP1 CHAP Authentication success
1/1/1970 0:0:24> PPP1: PPP IP address is 80.229.48.137
1/1/1970 0:0:24> PPP1: PPP Gateway IP address is 195.166.128.32
1/1/1970 0:0:24> PPP1: DNS Primary IP address is 212.159.13.49
1/1/1970 0:0:24> PPP1: DNS Secondary IP address is 212.159.13.50
1/1/1970 0:0:24> PPP1 Session is up.
1/1/1970 0:4:38> PPP1 Session is down.
1/1/1970 0:4:44> WAN auto connection attempt.
1/1/1970 0:4:44> PPP1 PPPoA Connected
1/1/1970 0:4:46> WAN auto connection attempt.
1/1/1970 0:4:49> WAN auto connection attempt.
1/1/1970 0:4:49> PPP1 CHAP Authentication success
1/1/1970 0:4:55> PPP1: PPP IP address is 80.229.48.137
1/1/1970 0:4:55> PPP1: PPP Gateway IP address is 195.166.128.32
1/1/1970 0:4:55> PPP1: DNS Primary IP address is 212.159.13.49
1/1/1970 0:4:55> PPP1: DNS Secondary IP address is 212.159.13.50
1/1/1970 0:4:55> PPP1 Session is up.
1/17/2004 2:47:14> Received time from Time Server 192.43.244.18
1/17/2004 3:0:5> PPP1 Session is down.
1/17/2004 3:0:28> WAN auto connection attempt.
1/17/2004 3:0:28> PPP1 PPPoA Connected
1/17/2004 3:0:30> WAN auto connection attempt.
1/17/2004 3:0:31> WAN auto connection attempt.
1/17/2004 3:0:33> WAN auto connection attempt.
1/17/2004 3:0:34> WAN auto connection attempt.
1/17/2004 3:0:38> PPP1 CHAP Authentication success
1/17/2004 3:0:39> WAN auto connection attempt.
1/17/2004 3:0:40> WAN auto connection attempt.
1/17/2004 3:0:44> PPP1: PPP IP address is 80.229.48.137
1/17/2004 3:0:44> PPP1: PPP Gateway IP address is 195.166.128.32
1/17/2004 3:0:44> PPP1: DNS Primary IP address is 212.159.13.49
1/17/2004 3:0:44> PPP1: DNS Secondary IP address is 212.159.13.50
1/17/2004 3:0:44> PPP1 Session is up.
1/17/2004 3:6:0> PPP1 Session is down.
1/17/2004 3:6:21> WAN auto connection attempt.
1/17/2004 3:6:21> PPP1 PPPoA Connected
1/17/2004 3:6:24> WAN auto connection attempt.
1/17/2004 3:6:30> WAN auto connection attempt.
1/17/2004 3:6:32> PPP1 CHAP Authentication success
1/17/2004 3:6:32> DNS WAN auto connection attempt.
1/17/2004 3:6:34> DNS WAN auto connection attempt.
1/17/2004 3:6:38> PPP1: PPP IP address is 80.229.48.137
1/17/2004 3:6:38> PPP1: PPP Gateway IP address is 195.166.128.34
1/17/2004 3:6:38> PPP1: DNS Primary IP address is 212.159.13.49
1/17/2004 3:6:38> PPP1: DNS Secondary IP address is 212.159.13.50
1/17/2004 3:6:38> PPP1 Session is up.
1/17/2004 3:6:39> Lost contact with DNS servers
1/17/2004 3:7:11> Regained contact with DNS servers

I've looked at the connection problems tutorial and tried the test login. The bt_test login connects but I cannot load the image. The bt_test_user login appears to connect but not the PPP connection.

I've swapped the filters, tried a different computer running a different OS with no luck. I haven't been able to borrow another modem.

A quick session of WinMTR shows the following:

|------------------------------------------------------------------------------------------|
| WinMTR statistics |
| Host - % | Sent | Recv | Best | Avrg | Wrst | Last |
|------------------------------------------------|------|------|------|------|------|------|
| 10.0.0.2 - 0 | 51 | 51 | 0 | 0 | 0 | 0 |
| lo1.homesurf.pth-ag2.plus.net - 2 | 51 | 50 | 0 | 158 | 220 | 160 |
| gi1-2.vlan16.pth-gw4.plus.net - 0 | 50 | 50 | 0 | 159 | 220 | 170 |
| gi5-0-4.pth-gw2.plus.net - 0 | 50 | 50 | 0 | 161 | 220 | 160 |
| linx-gw2.ja.net - 0 | 50 | 50 | 0 | 154 | 220 | 170 |
| gi4-0.lond-scr3.ja.net - 0 | 50 | 50 | 0 | 160 | 220 | 160 |
| po6-0.read-scr.ja.net - 0 | 50 | 50 | 0 | 163 | 330 | 170 |
| gi3-1.read-ssr.ja.net - 0 | 50 | 50 | 0 | 159 | 220 | 160 |
| lick.mirror.ac.uk - 0 | 50 | 50 | 0 | 314 | 1260 | 1260 |
|________________________________________________|______|______|______|______|______|______|
WinMTR - 0.8. Copyleft @2000-2002 Vasile Laurentiu Stanimir ( stanimir@cr.nivis.com )

I'm a bit stuck as to what to attempt next. Any ideas? Thanks.
9 REPLIES
N/A

Stuttering Connection

Line Attenuation looks large to me at 54.9 dB.
What do others think?
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Stuttering Connection

Still within limits for 512k, does mean 1Meg is a no no.

I would check what DNS settings you have as it sounds like a DNS lookup problem.

What windows version are you running?

For WinXP what do you get by running ipconfig /all at a cmd prompt.

For win9x/Me what do you get when running winipcfg (start -> run -> winipcfg) and looking at more info? Just click on the .. button to toggle the DNS server IPs being used.

The PlusNet DNS servers you should be using are 212.159.13.49 and 212.159.13.50. If you are not using them that could be your problem. You then need to check if they have been configured manually rather than from PlusNet.

Cheers

Peter Cool
N/A

Stuttering Connection

SNR is far more important than line attuation.

54.9dB with a SNR of 30.1 is pretty good. ADSL only starts to stutter in the lower teens (below SNR 12).

My advice here would be to contact PlusNet, ntoe the exist (within a margi of 10 mins) time and date of the 4 disconnects above, and ask if they can supply the reason code given by RADIUS for the disconnects.

Your modem doesn't appear to give much detail on why the connection died, and the RADIUS logs will shed little detail either, but are worth a shot.

What happens when attempting all this through the inner socket of your master faceplate?
N/A

Stuttering Connection

Thanks for the tips so far.

In reply to petervaughan, the DNS server setting is to use autodiscovered servers and it is picking up the IP adresses listed.

In reply to acarr, I'll try taking the faceplate of the NET5 master socket (I only have phone socket in the house) and plug into it directly. I'll also contact PlusNet and ask for the information you quoted.

Thanks for the help so far.
N/A

Stuttering Connection

I've got the extracts from the RADIUS logs. They don't seem to shed any light on what caused the disconnects.

Access Rack Last Event Event Time Message
195.166.128.10 ended 13:43 17/Jan/2004 static IP (reason unreported)

IP Assigned Service Calling From Session Started Session Ended Session Duration
80.229.48.137 unknown withheld 13:40 17/Jan/2004 13:44 17/Jan/2004 0:4:26

------------------------------------------------------------------------------------------------

Access Rack Last Event Event Time Message
195.166.128.10 ended 13:58 17/Jan/2004 static IP (reason unreported)

IP Assigned Service Calling From Session Started Session Ended Session Duration
80.229.48.137 unknown withheld 13:45 17/Jan/2004 14:00 17/Jan/2004 0:15:35

------------------------------------------------------------------------------------------------

Access Rack Last Event Event Time Message
195.166.128.10 ended 14:03 17/Jan/2004 static IP (reason unreported)

IP Assigned Service Calling From Session Started Session Ended Session Duration
80.229.48.137 unknown withheld 14:00 17/Jan/2004 14:06 17/Jan/2004 0:5:44

------------------------------------------------------------------------------------------------

I'll try removing the socket faceplate later.
N/A

Stuttering Connection

Reason unreported means that the connection was abruptly terminated, rather than your modem signing off.

Radius can shed little extra light, but can in some cases tell you if your rotuer performed a normal signoff or not.

The next step is the master faceplate.

After that, attempt to look for any patterns including.

Street lighting - Is it on or off? Does it flicker
Thermostats - Is it on or off, does it die when it switches?
Security lighting (your or your neighbours upto a few doors down) - DOes it coincidewith it going on or off?
N/A

Stuttering Connection

Thanks for all the help, I managed to sort the problem out. After trying every other option I turned to the modem.

I managed to borrow an Alcatel Speedtouch USB modem (the squashed frog) from a friend. This modem displayed none of the problems that the Zoom modem did. I took the Zoom modem back to the supplier and got a replacement.

The replacement works a lot better than the original (no stuttering connection) however it still drops the PPP connection fairly regularly. I can only conclude from this that the original modem was broken and that this particular make of modem does not operate properly under certain conditions, possibly towards the limit of the ADSL range.

This second Zoom modem is going back and an Alcatel Speedtouch 330 is on the way. Cheesy
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Stuttering Connection

It is possibly power issues on the USB port - this is quite a common reason for failures - i.e the USB port can't supply the necessary power and goes above the limit (500mA) and cuts out causing the modem to disconnect.

It is very difficult to investigate because even another modem of the same type may have slightly different power characteristics and work fine. And you old modem may have worked perfectly on another system.

There are USB compatibility issues around so hopefully your frog will be OK - my frog (510 model) failed with frequent disconnections (I had a VIA chipset that suffered USB power resets) and I bought an external modem/router/switch and connected via a lan cable to a network card instead - never had a problem since.
N/A

Stuttering Connection

Thanks for the info. I had read about USB power supply problems. However I have two PCs (different hardware) and have tried the modem on both with the same result. That isn't acceptable in my book and so the modem has gone. If it had affected one PC I could have accepted that.

BTW I'm not getting a frog, I'm getting the modem that supercedes the frog (the purple or silver one).