4 Possible Fault Locations
The BT Telephone Network map shown below in fig. 6 shows 5
locations.

fig. 6 - Simplified Map of the BT Telephone Network
The map shows the 5 general areas where a fault may be located :-
- Diagnostic Test Centre
This is not an actual location for the fault, rather it indicates that BT are still
carrying out tests to determine the most probable location of the fault
- Telephone Exchange
Tests indicate the fault is in cabling or equipment within the BT Telephone Exchange
- BT's Network
Tests indicate that the fault is in cabling or equipment between the BT Telephone Exchange
and the customer's property
- Close To Customer's Property
Tests indicate the fault is in cabling or equipment close to the customer's property. This
may include in some cases access to the customer's property to fix the fault.
- Customer's Property
Tests indicate the fault is in cabling or equipment on the customer's property, the
engineer will need to gain access to the property to fix the fault
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Fault locations are shown by hi-lighting the location on the BT
Telephone Network map. An example of a fault within the BT Telephone Exchange is shown in fig.
7 below.

fig. 7 - Example of a Hi-Lighted Fault Location, The Telephone Exchange
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