Frequently Asked Question - How do I correctly connect my LCC router to different BT wall mounted boxes (NTE) ?

How do I correctly connect my LCC router to different BT wall mounted boxes (NTE) ?

ADSL & Fibre Master and Test Sockets

There are various types of master socket depending on if you have ADSL or Fibre, most have test sockets, but some do not.
Note :  the connections to the rear of the master socket are for BT Openreach enginners, you are not allowed to touch these.

ADSL with no test socket
ADSL with test socket
ADSL with filtered faceplate
Fibre (VDSL) or ADSL with Service Specific Face Plate (SSFP)
NTE5c & MK4 Service Specific Face Plate (SSFP)

ADSL Master socket with no Test socket

This does not have a removable faceplate and as such, does not have a test socket.

How Broadband is installed with this type of socket

ADSL & Fibre Master and Test Sockets

ADSL Master socket with a test socket (NTE5A)

This will either have a faceplate with one unfiltered socket on it (micro-filters are required), or have a filtered faceplate with an ADSL and phone sockets (no filters required). With an unfiltered faceplate, remove the two screws and pull out the faceplate, the test socket is located in the bottom right of the main section of the master socket (called an NTE5A):-

With the faceplate removed all internal wiring will now be disconnected from the incoming line. For testing purposes connect the router to the "ADSL" port of a micro filter and a phone to the other port. Leave it like that for as long as necessary to prove the problem.

Note : if the faceplate is removed too forcefully, or simply too far, it is possible that the wiring could pull out of the connector on the faceplate. Thus the extension socket wiring will no longer work, unless reconnected correctly.

How Broadband is installed with this type of socket

Filtered Faceplate

Although the master socket looks different, just remove the two screws, pull out the faceplate and the test socket is again located in the bottom right of the main section of the master socket:-

With the faceplate removed all internal wiring will now be disconnected from the incoming line. For testing purposes connect the router to the "ADSL" port of a micro filter and a phone to the other port. Leave it like that for as long as necessary to prove the problem.

How Broadband is installed with this type of socket

DO NOT USE A MICROFILTER IN NORMAL OPERATION.

Fibre or ADSL with Service Specific Face Plate (SSFP)

Some fibre installations use the same faceplates as ADSL, in this case, consult the appropriate arrangement from the previous two examples. With the normal self installation of fibre, assuming that you have the standard NTE5 master socket, it is down to the customer to provide the faceplate of their choice. This could be the standard one in the faceplate example  & using a microfilter. However, to get the best performance, the the router needs to be connected directly to a filtered faceplate, designed for fibre.

If BT Openreach are asked to install a new master socket, then they will fit the latest version of master socket with the Service Specific Face Plate (SSFP) fitted. Around or before June 2017 it was probablt their MK3 version, which is suitable for both ADSL & VDSL (fibre) & looks like this:-

DO NOT USE A MICROFILTER IN NORMAL OPERATION.

How Broadband is installed with this type of socket


The router connects to the top socket (RJ11) & the phone to the lower socket. The downside of all this is that it is slightly more involved to get to the test socket.

Accessing the test socket when an SSFP is used

  • First off remove the two screws and remove what is called the “Consumer faceplate”

  • Next pull the “Interstitial faceplate” away from the backplate of the master socket, revealing the same test socket seen with the ADSL examples previous.

  • With both faceplates now removed, all internal wiring will now be disconnected from the incoming line.
  • For testing purposes connect a new microfilter to the test socket above. Ideally connect the router via a new cable and one phone to this filter.
  • Leave it like that for as long as necessary to prove the problem.

NTE5c & MK4 Service Specific Face Plate (SSFP)

BT Openreach introduced a totally new Master Socket in September 2016, which is called the “Master Socket 5C” or “NTE5C”. The most important thing to note, is that no faceplates mentioned earlier will fit it. They are all designed to fit on to the older NTE5A.  You may notice from the picture below that the new master socket is curved around the edges, unlike its predecessor which was angular:-

How Broadband is installed with this type of socket

Removing the faceplate

To remove the normal faceplate it still pulls out at the bottom, but there are no screws to remove.

You simply press in the two clips one on each side & pull it out:-
Note:  there is a potential problem where the faceplate is only secured by press on clips, rather than screws. If the socket is knocked (particularly with the SSFP which protrude further out from the wall). This will
disconnect the phone or broadband connection. In time these clips might break off. As  always the customer is responsible for the faceplate. This might cause an intermittent problem on either the phone, broadband or both services.

Before reporting a problem with your service, make sure that the faceplate is properly secured to the back panel of the master socket.

Test Socket

The test socket is basically in a similar place as the older NTE5A but not identical. This will prove a problem with LCC supplied TP Link TD-W9970 routers. This is because the filter with the unit provided is an all in one single module filter. You will find that microfilter used for test purposes impinges on the backplate overhang. If this is the case please call LCC and we will send you a flexible filter free of charge. DO NOT force the filter in to the test socket:-


Note : When the faceplate is removed any wiring to consumer extension sockets is still automatically disconnected, despite these being on the main part of the master socket, not on the rear of the faceplate. This is due to an extra set of connectors at the bottom of the test socket in addition to the usual ones at the top. The faceplate makes a connection between the top & bottom connectors of the test socket.

The MK4 SSFP

The new SSFP faceplate looks like this:-


This is simply pushed on to the NTE5C & clipped into position in place of the original faceplate. At the rear of the SSFP is a red terminal strip allowing the router to be cabled away to its own extension socket, without the need of any filters, as telephones must not be connected to it:-


Note :  Such cabling is very likely to have an adverse affect on your speed if fibre (VDSL).

Another important note. The data port is an RJ45 ethernet socket. HOWEVER - The smaller RJ11 ADSL/VDSL smaller plug does fit in to the socket. DO NOT USE A MICROFILTER IN NORMAL OPERATION.

How Broadband is installed with this type of socket