(Stuart got there first, but I'll post anyway)
If the phone extension still works with the master socket faceplate removed, then you have a wiring defect which needs to be corrected. Somewhere between the master socket and the incoming telephone cable there must be a connection branching off to the extension. This is very likely to degrade your DSL connection.
As this is on the BT side of the master socket, the proper thing to do is get OpenReach to regularise the wiring. This would involve disconnecting the extension at the point where it branches off from the incoming cable. If you want to retain the extension, then it would need to be rewired to the back of the master socket faceplate.
Eric, hope you can help here please ?. The following is a 'Cut & paste' from our latest edition of the 'Loop'. I wanted to put it under it's own header but for some reason the Kitz site is not allowing me to see the full forum topics ?? I can only click on the 'latest' topics. Ironically, the 'C&P' relates in some
small way to the convo here. Cheers Eric.
CP engineers working on our network After consultation with our CPs, we’ve agreed that their engineers – once accredited to our quality standards – will be able to carry out four very specific tasks on our network:
1. Replacing a damaged NTE5
2. Installing a new NTE5 to replace an obsolete version or where no NTE exists (does not include providing service)
3. Moving an NTE5
4. Removing non-compliant star wiring from a NTE5
Why we’re doing thisFollowing a successful proof of concept trial with three CPs, we were able to demonstrate that it improved customer satisfaction (for CPs and end customers), reduced the number of ineffective Openreach visits and will speed up of the roll out of the new NTE5.
When this will happenA policy change will take effect from Monday 7 September and all of our CPs will be able to participate.
What about if there are subsequent faults from poor workmanshipIt’s important to state that there were no issues identified during the proof of concept. However, if a fault is reported on a line worked on by a CP’s engineer - and poor workmanship is to blame - a TRC will be raised by an automated process. The process works by checking the clear code used by our engineer who goes to fix the fault.