The Pre-Connection Inspection (PCI) was a requirement
by British Telecommunications before the system was connected
to their network.
With the large numbers of alternative networks today the operator
does not always require the PCI. However it is good practice
to conduct your own PCI prior to going live with a system
to catch any obvious mistakes and correct them.
Whenever a system is to be connected or reconnected to the
network it should undergo a PCI to ensure that the equipment
is approved and has been installed in the correct manner.
In most cases this means that the installation conforms to
BS6506 or BS6701 Pt1, and will include earthing, separation
of telecommunications wiring from other wiring, compliance
with any system specific requirement laid down in the Private
EXchange Master List (PXML) if the system is covered by one.
In addition to the installation work itself the documents
which will aid future work on the system should be checked
and kept in order. Make the customer aware of their location
and that they be kept safe; preferably with the system itself.
The customer should be provided with Operating Instructions
and User Guides with the system. In some cases the PXML will
specify additional manuals to be provided.
The site records will contain the notes and reports used by
the engineers during the installation process. These will
describe the installation in sufficient detail for future
engineers to work on or maintain the system leaving a copy
of these with the site is good practice and will make any
additional future work much simpler.
The PXML used to be an essential document for the PCI. This
requirement was relaxed in 1996, when it became optional for
a PXML to be supplied with and for telephone systems. Today
the PXML should be included in the PCI checking as it specifies
the components and requirements for the system installation
and can be used to ensure the correct installation of the
When provided the PXML will specify the equipment or equipment
types which can be connected to the system, which types of
network connection can be made, special protection and installation
requirements and permitted software. Each time a change is
approved to the design the manufacturer will be issued with
a new PXML covering the changes. This will be included in
future product or sent out to the manufacturer agents selling
the equipment. Not all equipment will have a relevant PXML
if it was released or updated after 1996.
If the system is covered by a maintenance contract. It is
recommended that a copy be included for reference in the documentation