Click to Access the Control Pages

Accessing This Feature

Access is via the Control Pages as follows:

  1. Log in to the Control Pages with your xxx@a login
  2. Click on the line you want to run the diagnostics on
  3. Click on the 'Knoweldge Based Diagnostics' button, and follow the instructions from there


  • On BT based ADSL, FTTC and FTTP circuits


KBD is a tool provided by BT, results can vary, but BT require us to run a KBD before reporting a fault.

It can be useful in identifying faults, but often it will say no fault found even when there is.

It can detect if there is a phone line fault and may suggest reporting it to 'OR' (Openreach). In this case, report the fault to the phone line provider.


KBD reports there is a Major Service Failure affecting this line, BT will already on the case in fixing it
This was a line below the fault threshold rate (i.e., slow). We'd report a fault after doing the standard tests