1.11 What types of infrastructure are incompatible with ADSL that can be bypassed by the transpositioning process?
Pair Gaining (PGS): This is a line splitting process where one copper line is split into two, to allow two telephone services. It is used in areas which have no main copper lines left to enable additional phone services.
Remote Index Multiplexor (RIM): This is a device that splits a Fibre-optic link to an area into hundreds of copper lines. As the copper line only runs from the premises to the RIM, ADSL is incompatible with their line.