Ideal to Replace your Master Socket or as an extension in the Home or Office Please Note: These Sockets Do Not Have Any BT Logo On Them. BT NTE5 Type socket. Latest version (NTE5A) with the filter on the bell Wire Circuit for improved ADSL performance. In recent years NTE5 sockets have been fitted in place of master sockets. These have a front plate where the lower-half is removable so allowing customer's access to the terminals required for Connecting internal extension sockets it also provides access to a test jack, to determine if line faults are due to the customer's wiring or BT's. The removable panel also allows the external telephone line to be easily disconnected from the internal wiring, provided the wiring of the premises has been correctly carried out. Now that BT does not have a monopoly on the internal wiring, they make a substantial charge if a fault reported to them turns out to be in the customer's internal/domestic wiring. It is therefore important for the customer to have the facility to check whether any problem or fault is in their internal wiring/equipment or externally in BT's cabling or systems. Since the NTE5 socket represents the official demarcation point between the internal/domestic wiring (at the removable front of the socket which is the customer's responsibility) and the external telephone line/cabling fixed at the rear (which is BT's responsibility) the physical disconnection of the two wiring's (made possible by the NTE5's removable front plate) is crucial in identifying faults and allocating responsibility for their rectification.
