Time slot interchanger

In a telephone system operating in time frames each consisting of a plurality of time slots, a time slot interchanger for connecting data samples between locations in the telephone system comprising:

• first and second data memory means for storing and transmitting pulse code modulated data samples where each memory means includes a number of separate data stores corresponding to time slots,
• a number of cross point switches,
• a first data bus for connecting data between said first memory means and a first one of said cross point switches,
• a second data bus for connectng data samples between said second memory means and a second one of said cross point switches,
• a number of third data buses, each connected between one of said cross point switches and a different one of said locations,
• channel memory means having a plurality of control stores, selected ones of said control stores corresponding to selected ones of said data stores for storing instruction addresses comprising selected data store addresses for addressing said selected ones of said data stores and comprising selected cross point switch addresses,
• cross point control means for controlling the connection of said first and second buses to said cross point switches in response to said cross point switch addresses,
• and time slot counter means counting from an initial count to said number of time slots for addressing said channel memory means, said counter means including means for alternately addressing said first and second data memory means in successive time frames whereby said first and second memory means are alternately addressed by said channel memory means and said counter means.