Re: Another obsolete gadget.
Mercury Communications used them for accessing information on Subscriber Pulse Metering Equipment (SPMG) in the 90’s. This kit allowed hotels to provide local billing, buy cheap minutes of Mercury (always cheaper the BT) and charge whatever ppm rate they wanted to.
I remember being called to faults where customers had been charged hundreds of pounds for a single call, we could use these to check the pulses were correct and what tariff the hotel had chosen, there was never a fault just greedy hoteliers.
John
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