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NTE8E Engineer’s Installation Guide  

 

British Telecommunications plc 2004 

www.bt.com/isdn

 

 

The ISDN2e Network Terminating Equipment NTE8E is manufactured by  

 

Introduction 

• 

The NTE8 is the customer termination for the BT ISDN2e service and this 

document is a guide to the installation procedure. 

• 

This unit is a direct replacement for the NTE8A, B, C and D.  
It must not be used as a replacement for an NTE6

• 

This NTE has the addition of a copper by-pass feature that enables a 

no-customer visit to change service to PSTN or Broadband and will take 
the place of an NTE5. 

• 

This unit can also be used on low voltage ISDN lines. 

 

Unit Description 

PSTN

Connector

Access to removable cover

BT Engineer only

Network cable entry

Enhanced

Status LED

SW1
IN / OUT

SW2  L / S

ISDN Terminal Equipment

Figure 1 

 

 

Installation 

 

1. Wall mounting 
The NTE8 can be mounted in most domestic and office environments, avoiding 
direct sunlight, sources of heat, sources of electromagnetic radiation, and areas 
which are subject to high humidity such as kitchens and laundry rooms etc. 
The NTE must be mounted with the customer sockets facing down. 
Use the template provided with this guide to mark the two fixing screw positions. 
Please note that a minimum of 190mm clearance is required (marked by dashed 
lines) to enable the customer to insert and remove the extension cabling or 
terminal equipment plugs into the RJ45 sockets and to enable the installation 
engineer to open and remove the cover. 
CAUTION: Before drilling holes, make sure that there are no concealed 
installations (e.g. power, water, gas).
 
Drill (

 6 mm) and plug the wall for the two cross-

head screws provided. For a hollow wall, suitable 
proprietary fixing should be used. If fitting to wood, 
drill suitable pilot holes. 
Position the screw that will mate with the keyhole 
fixing, leaving approx 2mm protruding (see fig. 2a) 
to allow a snug fit in the slot and the NTE lies flat 
against the mounting surface without any case 
distortion. 
Hang the NTE over the screw head and pull it 
down until it locks in place safely (see fig. 2b). 
Then insert the second screw in the lower hole. 
Ensure that the case fixings are sound and that 
there is no movement, but do not over-tighten the 
securing screws. 
 
ATTENTION! – Default Configuration 
Check the IN/OUT and L/S switches are both in the 
default position of “IN” and “S” unless providing 
Customer Extension Wiring. 
 

Document Number: 8820  

11. October 2004 

  

 

 

 

 

ATTENTION! Dangerous Voltage! 
The ISDN connection is a voltage source that should be inaccessible to the 
user. The NTE cover shall only be opened by BT ISDN trained engineers. Do 
not touch the PCB unless you are wearing an anti-static strap. The strap is not 
required for normal line installation. Do not install the NTE or work on the line 
during thunderstorms. 

 

2. Connecting the NTE8 to the Network 
Remove the BT Engineer-only-removable cover to gain access to the network 
wiring connectors. This cover is attached to the lower part of the NTE with a clip. 
To loosen the locking mechanism use a No.1 screwdriver and push it slightly 
into the rectangular slot above the switch marked “OUT” (see Unit Description). 
Strip approximately 100mm of sheath from the network cable, feed the cable 
into the NTE and route the cable through the chicane. (see fig. 3). Terminate the 
cable on the IDC, wiring polarity is unimportant. Replace the network access 
cover. 

 

Network cable
IDC connector

Network cable

Tension relief

SW3 for 
Bypass function 
(see chapter 6),
default setting: 
Plug & Play

ISDN

Plug&Play

Figure 3 

Write the customer directory and fault reporting number on the customer service 
label. 

 

 

3. Lightning Protection 
Lightning protection shall be provided as for standard PSTN lines. Where the 
service is provided via aerial cable either over more than three spans, or in 
areas with a high risk of electric storms, the circuit may require additional 
protection. Please refer to the Lightning Protection Handbook 
ISIS/EPT/PPS/B055. 

 

4. Customer S-Bus Extension Wiring (Chargeable Option) 
Cable to category 5 specification should be used to complete the installation. 
Please refer to the table below for RJ45 wiring and Figure 5 for sample wiring 
configurations / switch settings. All extension wiring MUST have a Type 2 socket 
(which incorporates terminating resistors), as the last socket. 
Further wiring details can be found in BS EN 50098-1. 

 

Pin Wire 

colour 

TE 

NT 

White/orange 

P Source 3 

P Sink 3 

Orange/white 

P Source 3 

P Sink 3 

3 White/green  Transmit  Receive 
4 Blue/white  Receive 

Transmit 

5 White/blue  Receive 

Transmit 

6 Green/white  Transmit  Receive 

White/brown 

P Sink 2 

P Source 2 

Brown/white 

P Sink 2 

P Source 2 

 

5. Testing and fault locating 
A green LED in the centre indicates the status of the NTE. 

 

LED Indicator 

OFF 

No Service or device in bypass mode 

ON (dim) 

Exchange line Voltage > 30V 

but  line side deactivated, no layer 1   

Flashing quickly  

(8 Hz) 

Network connection activating 

Flashing slowly  

(1 Hz) 

Normal Service (layer 1) with No Customer Terminal Equipment 

(CPE) connected or detected. Network connection active but 

customer side S-Bus deactivated (or activating). 

ON (bright) 

Normal Service (layer 1) with CPE connected and detected. 

 

3  

 

 

Hinweis für die Herstellung: Papier unterhalb dieser Linie abschneiden! 

Note: Cut off paper below this line! 

Figure 2a

Figure 2b

NTE

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