broadband connection problem

  gippingman 19:45 12 Nov 2006

I have a pc connected by ethernet cable to a linksys wag54gs wireless modem/router which then supplies a signal to 2 wireless laptops. I use windows xp and my ISP is Talk Talk. The problem I am having is that the "dsl" modem light intermittently goes out and drops the connection and then eventually will illiuminate again and the connection is restored. It appears that this has been a problem since talk talk increased the connection speed - it seems that the connection speed is perhaps too fast?? (around 3.5-4mbps at its peak) and therfore less stable. Is this possible? I also have Internet Connection Service on the laptops, but not sure if this causes any problems- any thoughts/advice on how to establish a more reliable connection as it is very frustrating because when it works, it works very well!?? - thanks

  anskyber 20:27 12 Nov 2006

How long have you had the BB connection for "up to 8meg" or similar?

  Dipso 21:10 12 Nov 2006

It sounds to me like you are experiencing problems due to noise on your line. If the downstream noise margin drops well below 6db, which can commonly happen in the evening due to interference from external sources, your line will drop and resync at a lower connection speed.

It's unlikely to be anything to do with ICS.

If you are in the first 10 days of being upgraded your line will be monitored by the kit at the exchange to find what level of sync is most stable for you.

One way to improve your noise margin and thus possibly prevent disconnections is to check out your internal wiring. Follow this tutorial click here

  johnem 21:17 12 Nov 2006

Thanks for the tips.

  gippingman 21:55 13 Nov 2006

I have had the upgraded connection (up to 8mb0 service since 11.10.06

  Dipso 22:07 13 Nov 2006

So we've established that this problem isn't to do with the line settling down during the training period.

There are things you can do to stop this happening, one being the DMT tool click here This can be used to fix your noise margin to a higher figure and thus force your line to resync lower but make your line more stable.

I still suggest you check your internal wiring first though. Tell me how you connect(e.g. through an extension) and I will try and help you.

  Dipso 22:15 13 Nov 2006

It would also help if you could find out your line stats. Try this if you can.

First, type this into your web browser
h t t p ://1 9 2.1 6 8.1.1/setup.cgi?todo=debug (without the spaces between the letters and digits)

Afterwards, click, "Start, then "Run" on your PC. Then type in "CMD".
A pop up DOS box will appear.

Type: telnet 1 9 2.1 6 8.1.1 (again without the spaces between the digits)

type in this command: (exactly as shown)
adslctl info --stats

When you have the stats, right click on the blue bar at the top, Choose Edit and Select all, Edit Copy, Edit Paste and paste the results here.

Type exit to close the DOS box.

  gippingman 09:07 14 Nov 2006

dipso - thanks - heres the info (hopefully) and at the bottom is an explanation of my extension box wiring.

BusyBox v1.00 (2005.12.07-10:11+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

# adslctl info --stats
adslctl: ADSL driver and PHY status
Status: Showtime Channel: FAST, Upstream rate = 445 Kbps, Downstream rate = 383
1 Kbps
Link Power State: L0
Mode: ADSL2+
Channel: Fast
Trellis: ON
Line Status: No Defect
Training Status: Showtime
Down Up
SNR (dB): 5.6 14.0
Attn(dB): 61.5 33.2
Pwr(dBm): 0.0 12.6
Max(Kbps): 3904 720
Rate (Kbps): 3831 445
G.dmt framing
K: 56(0) 49
R: 8 2
S: 4 2
D: 32 8
ADSL2 framing
MSGc: 64 14
B: 55 48
M: 4 2
T: 2 1
R: 8 2
S: 1.8541 6.8965
L: 1001 116
D: 32 8
SF: 197939 197937
SFErr: 3103 0
RS: 6927900 6729858
RSCorr: 262621 0
RSUnCorr: 40482 0

HEC: 2591 0
OCD: 44 0
LCD: 0 0
Total Cells: 28984979 103872
Data Cells: 8405 10
Drop Cells: 0
Bit Errors: 0 0

ES: 5512 0
SES: 308 0
UAS: 661 0
Total time = 11 hours 13 min 16 sec
SF = 2453667
CRC = 35225
LOS = 2
LOF = 0
ES = 5512
Latest 1 day time = 11 hours 13 min 16 sec
SF = 2453667
CRC = 35225
LOS = 2
LOF = 0
ES = 5512
Latest 15 minutes time = 13 min 16 sec
SF = 49115
CRC = 953
LOS = 0
LOF = 0
ES = 176
Previous 15 minutes time = 15 min 0 sec
SF = 55463
CRC = 965
LOS = 0
LOF = 0
ES = 153
Previous 1 day time = 0 sec
SF = 0
CRC = 0
LOS = 0
LOF = 0
ES = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF = 55463
CRC = 736
LOS = 0
LOF = 0
ES = 130
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF = 52927
CRC = 837
LOS = 1
LOF = 0
ES = 147
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF = 56125
CRC = 906
LOS = 0
LOF = 0
ES = 164

Main BT box (which has sky box connection and microfilter etc)then has wired extension of approx 2.5 metres (to enable phone to be plugged into nearby mains socket), then further wired extension (from extension socket)of approx 10 metres to enable pc to be used in another part of the room and nearby further electrical socket. Although it may seem a strange set up, it has worked for years prior to broadband and post broadband with only the odd technical hiccup, which when it does occur, i feel may be a pnone line/network problem - any further thoughts? ta

  Dipso 09:37 14 Nov 2006

I've had a quick look and can see some areas which may explain the problems you are having. I have to nip out this morning so will have to get back to you later but basically this Attn(dB): 61.5 tells me that you are a fair distance from the telephone exchange which can cause sync problems but I think this SNR (dB): 5.6 is the reason you are experiencing the disconnections. Your router usually needs a minimum SNR of 6 to hold a connection, if it drops much below it will lose sync.

Your existing telephone set up may have worked fine for 512/1/2 Meg broadband but the faster products are more fickle and what worked fine before may not work so well after the upgrade.

Some routers cope better than others, fortunately yours is one of the routers that works with a software tool that can be used to fix your SNR possibly at the expense of sync speed to maintain a stable connection. As I say I will post back later but we definitely need to look at your wiring to try and squeeze a bit more SNR out of your line before we consider using the tool.

  oldbeefer2 10:34 14 Nov 2006


  Dipso 13:51 14 Nov 2006

I think these extension are probably weakening your signal. Is wireless not an option you would consider? If you could get your router connected at the master socket and you would almost certainly benefit.

If wireless isn't something you would consider could you not connect your router to the master socket and manage to run a Cat5 network cable to the PC. This would provide a much better connection than using long extensions.

Even though you have the Sky box connected through a filter, Sky and broadband don't go well together. Does the Sky need to be connected to the phone line all the time? My T&C's only required me to have it connected fot the first 12 months, it may however be different for you.

Something you could try is taking off the removeable faceplate on the front of the master socket and check which wires are connected to the back of it. If there are wires connected to connectors other than 2 and 5 then they can be safely removed. These wires can be a source of interference. You need to check each extension socket in your house and remove all uneccesary wires leaving only 2 and 5.

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