Due to the improved electronics TXE4A and TXE4E (or TXE4RD/IW interworking) were able to receive downloadable updates for tariff data at bank holidays etc. This downloadable capability enabled the centralised control of a lot of the manual functions that previously had to be carried out manually at each exchange. Tariff changes for the eight million customers could be built and implemented by one person following the introduction of a centralised data management tool. At the time this gave a similar capability as available on the System X and AXE10 exchanges.