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Sockets - Line Jack Identification and Network Termination Equipment

Network Termination Equipment (NTE)
         

NTE5 A Master Socket
86mm x 86mm x 36mm
Contains ring capacitor, surge arrestor & resistor
NTE5 front
NTE5 reverse
NTE5 full master socket

NTE5 A Faceplate
Reverse
NTE5a faceplate reverse
pre 2007
NTE5 faceplate 2007 reverse
2007
With effect from late 2007, new installations should be fitted with a bell circuit filter, these NTE5's are identifiable from the front cover by being marked "Openreach".
NTE5 A Faceplate
(ADSL)
ADSL splitter faceplate for
NTE5 units
adsl filtered faceplate
NTE5 adsl faceplate reverse
NTE5 adsl faceplate
         
Line Jack Units (LJU)
 

LJU Master sockets are usually easily identifiable as the line jack unit will contain a ring capacitor, surge arrestor & resistor.

To the right is a photo showing typical component layout of a master socket found in the home. Layout and colour of the circuit board may vary slightly depending upon date and manufacturer.

Connector pins are usually white IDC, which need a Krone insertion tool, but some older versions may have screw connectors.

Below are some photos of typical line jack units which may be found in the home.
telephone jack components
 
LJU1
LJU1 master socket front
LJU1 master socket reverse
LJU1-3A Secondary

Faceplate cover is deeper and components are more recessed.

 55 x 55 x 29mm
Master
LJU1/1A - IDC
LJU1/4A - Screw
Secondary
LJU1/3A - IDC
LJU1/6A - Screw
LJU2
Master
LJU2 master socket front
LJU2 master socket reverse
LJU2-1A Master Telephone Socket
LJU PSTN master socket

68 x 68 x 29mm

LJU1/1A - IDC
LJU1/4A - Screw
LJU2
Secondary
LJU2 master socket front
LJU2 secondary socket
LJU2-3A secondary BT socket
PSTN LJU2 secondary socket

68 x 68 x 29mm

LJU2/3A - IDC
LJU2/6A - Screw

LJU3
Master

 
LJU3 phone socket faceplate
LJU3/1A master phone socket
LJU/4A Master Socket
LJU PSTN master socket

86 x 86mm

LJU3/1A - IDC
LJU3/4A - Screw
LJU3
PABX Master
LJU3 phone socket faceplate
LJU3/2A PABX Master socket
LJU3/5A PABX Master Socket
PABX Master Socket

86 x 86mm

LJU3/2A - IDC
LJU3/5A - Screw
LJU3
Secondary
LJU3 phone socket faceplate
LJU3_reverse
LJU3/6A secondary telephone socket
PSTN LJU2 secondary socket

86 x 86mm

LJU3/3A - IDC
LJU3/6A - Screw
LJU4
LJU4 telephone socket front
LJU4/1A Dual line Master socket
LJU4/4A Dual Line Master Socket
LJU4/3A Dual Line Secondary Socket
86 x 86mm
Dual Line Master
LJU4/1A - IDC
LJU4/4A - Screw
 Dual Line Secondary
LJU4/3A - IDC
LJU4/6A - Screw
LJU5
LJU4 front
LJU5/1A Twin Master socket
LJU5/4A Twin Master Socket
LJU5/3A Twin Secondary Socket
86 x 86mm
Dual Line Master
LJU5/1A - IDC
LJU5/4A - Screw
Dual Line Secondary
LJU5/3A - IDC
LJU5/6A - Screw
DSL Data Extension kit
dsl data extension kit
dsl data extension kit
Fitted by Openreach as a dedicated extension for DSL.

Socket is RJ11 to receive modem/router cable.
Cable has additional twists in each pair, similar to CAT5 cable.
 
Further help with line jack identification.

Faceplate - Front
 Type Size
Phone Jacks
Phone Lines
 LJU1 55mm x 55mm x 29mm
1
1
 LJU2 68mm x 68mm x 29mm
1
1
 LJU3 86mm x 86mm
1
1
 LJU4 86mm x 86mm
2
2
 LJU5 86mm x 86mm
2
1

Components
Series
Capacitor
Surge Arrestor
Resistor
Terminal
 Type
/1
Yes
Yes
Yes
IDC
 Master
/2
Yes
-
-
IDC
 Master PABX
/3
-
-
-
IDC
 Secondary
/4
Yes
Yes
Yes
Screw
 Master
/5
Yes
-
-
Screw
 Master PABX
/6
-
-
-
Screw
 Secondary

 
Block Terminal Connectors
 
Block Connectors

BT connectors (Block Terminal)

Used by BT to connect standard telephony wiring.
These are the property of BT and should not be tampered with.

 BT80A wired
Most commonly seen to connect the drop wire to internal cable and are often found in the loft or other point of entry to a building.
   

BT77A

3 pair IDC to
3 pair IDC

 BT77A

BT77B

3 pair screw to
3 pair screw

 BT77B

BT78A

4 pair IDC to
4 pair IDC

 BT78A

BT80A

3 wire IDC to
drop wire

 BT80a

BT92A

BT Redcare Alarm
BT92a Redcare alarm box

BT92A

Internal.

Use caution if checking your telephone wiring to ensure you don't inadvertently set off the alarm
BT92a Redcare alarm box inside

BT80A RF2

3 wire IDC to screw
with 2 x inductors

Can cause problems with adsl. If you have one of these contact your ISP to arrange an RF3 to be fitted free by Openreach.

 BT80a RF2

BT80A RF3

3 wire IDC to screw
with 2 x inductors

Used to help filter RF interference for voice

 BT80A RF3

External NTE

With effect from Dec 2008, BT have started installing External NTEs on new build properties. These new NTE housing boxes can terminate up to 2 x copper pairs.

The box will be located on the exterior of the premises allowing BT Openreach Engineers easy access for testing etc and are clearly marked "Wiring and equipment from this point belongs to the property owner. Where Openreach attend for a reported fault and determine that the fault is beyond this point the visit and any work will be chargeable."
BT External NTE
External NTE

Inside the grey NTE is a red tamper proof unit where the copper pair terminates and are connected to the box by an IDC labeled A and B.

The box is also said to contain a filter to help prevent electrical interference.

Entry point to the customer premises is via a cable that passes through the rear of the box which connects to IDC terminals labeled 2, 3 & 5. The orange ringwire is not connected in order to reduce interference on adsl enabled lines.

External NTE - inside the box
Inside the External NTE box

The External NTE unit contains a yellow plug which can be removed to disconnect the customer owned wiring, when testing by an Openreach Engineer.

BT appear to be connecting these new units internally to LJU's (non NTE5 sockets) which unfortunately means that there is no internal test socket for the customer.
External NTE yellow plug       external NTE yellow plug removed
BT yellow plug & test socket
 
Thanks to Zen Tech - A Eldridge for the External NTE photos
 

More information on phones and sockets can be found at Telephones UK
 
 
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