English translation: telecommunication switching system
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Explanation: The term 'Maklersystem' would indicate a telephone system used in a dealing room, or on a dealing floor. These are commonly referred to as 'dealerboards'.
The link provided also contains an explanation why telecommunications systems in a financial trading environment need to be different. (Just imagine having to watch 10-20 direct lines, and having to talk into 2, 3 or 4 lines simultaneously... yes, it can be done...*g*)