Can cross talk cause peak slow down if SNR OK?

[bignose2]

Hi,

Recently moved business broadband,

Promised much reduced peak slow down, Does seem somewhat better but sill get some dramatic slow downs and wonderd if there were other issues. I suspect non enough bandwidth at rural exchange but hoped Business priorty might cut to a minimum.

Use iPlate, i.e. only modem only access to faceplate, other phones isolated.

About 3km from exchange so good ADSL1 speed at very steady 6MB throughput but some (most, now) evenings it goes under 1MB.

SNR is pretty steady with max range perhaps 5.5 to 6.4. Never seem to get any drop outs.

If it was crosstalk would it show up in poor SNR?

Done pingtest.net and usually grade A, few times grade B with nearly always zero packet loss, but occassionaly a little. Not sure how useful this info is. Jitter zero or <2%

Can't find any pattern, 99% nothing in my house. Times do seem quite erratic. Location, i suspect at end of line with only a few houses close by (nearest 100m) v.few between me & this side of exchange.

Not down to over use, no P2P or excessive downloads. On unlimited, ha, but still bet less than 10MB per month but whilst drop in speeds fast & hard don't think throttling & can still get up to 5800Kbps pm sometimes !

Linksys WAG160N

Would you suspect crosstalk or can this be pretty much ruled out if during peak my modem reports 7230 Down with SNR 5.5 (at worst)

Thanks I/A

[Fiona]

Hi

I'm really sorry no one on the forum has been able to offer any advice with this issue. Checking your service you are on the 'upto 8mb Connections' so the speed would be upto 448 upstream and upto 8mb downstream. Obviously the actual speed you get is dependant on your line quality and length.

If your connection drops the line will try and stabilize itself which can cause your speeds to drop. If you are having problems with your connection you would need to contact the technical team so they can check the connection.

The following help and support files may also offer some advice.

I keep losing my Broadband connection. How can I fix it?

My Broadband connection is slow. What can I do?

Kind Regards

Fiona

BT Business Forum Moderator

[Redbull]

Hi Bignose2,

There are quite a few things that can cause this...

Sync rates fluctute all the time however the change should be very minimal. The fact that your SNR is varying by 1dB means that your sync rate will be varying by about 600Kbps and therefore changing IP Profile via DLM.

Every time your sync rate adjusts it will loose bits within the router "bin" architecture and will have to resend. This in turn will show as slow throughput however will only ever show as a ping time out if a full packet fails.

Can you clarify what is meant by phones isolated? The only way they can be isolated it for them not to be connected? Do you have phones on other extensions?

If you have other extensions within the premises then the physical extension wiring can be causing interference which causes noise which in turn causes lower sync rates and much reduced throughput (but only when the noise is present). If this is the case try your router directly into the test socket via your microfilter. ie: remove the two screws from the faceplate, remove the iPlate and try from the socket that is exposed.

If you do not have any other extension wiring then the iPlate serves no purpose and can actually be counter productive as it is effectively another filter on the line to reduce the effect of noise from the bell wire on extension sockets.

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

Alternatively, how are you connected? Wired or wirelessly?

If you are wireless then check your router GUI to see if it is erroring. If you use our 2700/2701 router you can locate this information by typing 192.168.1.254 from internet browser and under Settings > LAN  and scroll to the bottom to see "errors". If there are then try moving the router away from other electical sources or changing wireless channel.

Alternatively something is being downloaded on your pc or another pc at the same time and therefore your bandwidth is split over all these downloads - you say you believe you are less than 10MB per month, I assume you mean 10GB???? I have checked your usage and (assuming you mean 10GB) you are actuallay using more than that in one week.

If you are not aware of this amount of data, maybe a virus/malware???

In some cases it turns out to be a combination of all three of these!!!

Lots to check but one thing I can definately tell you... it is not BT related.

Please let me know what fixes it!!!