Slow ADSL CQM

Using our CQM graphs can give you a good idea as to what could be causing a line to be slow.

You can take a look at your graph and compare it to the examples below to see if there is a match.

Lots of traffic on the line

Here is an example of a CQM Graph with lots of upload traffic,

Lots of upload at the end of the day

The example above show a line with occasional short uploads causing spikes in peak latency, and then a sustained upload starting at around 6pm and causing high latency (queue in the router). At 8pm there was more upload filling the link causing higher latency still and some loss (normal when the link is full). This is normal.It may cause the line to be slow. If you don't know what the traffic is, then you can do a Traffic Capture or ask Support to Help.

Sync rate has been capped or lowered

You can check the linerate of your line - this is the speed of the line as reported to us by the back-haul provider.

Examples:

Line rate as shown on the control pages, ie 39.8M - Good!

This one has a rate of 338k - something is wrong!

1. Log in to the Control Pages
2. The line rate is usually shown on the front page, as per the image above