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If Vodafone designers read this, please put a longer cable on your ADSL router power supplies. My nearest power supply is about 6 feet from where the router needs to live and your cable simply isn't long enough.
For anyone needing to extend the cable, the connector is a 5.5x2.5 (5.5mm external, 2.5mm internal pin). Be aware that almost identical 5.5x2.1 (smaller internal pin) will not work.