Unfortunately BT’s systems are a hodge podge of different systems written and built over the last 40+ years, in various states of development from brand new, bleeding edge, to abandoned, running on an excel spreadsheet. To say the overall system was “designed” is to misunderstand the size and complexity of BT and its legacy systems. The fact that it works at all is a miracle borne out of the sweat and talent of great engineers hampered by busybody managers.
Unfortunately BT’s systems are a hodge podge of different systems written and built over the last 40+ years, in various states of development from brand new, bleeding edge, to abandoned, running on an excel spreadsheet. To say the overall system was “designed” is to misunderstand the size and complexity of BT and its legacy systems. The fact that it works at all is a miracle borne out of the sweat and talent of great engineers hampered by busybody managers.