Input waiting line system especially provided for connection to the inputs of a blockage-free switching matrix of the spatial type

Input queueing system for connection to n inputs of a switching matrix (MatCom) having m outputs;

• said queueing system comprising a succession of G input circuits (CE.sub.1 to CE.sub.n) each of which is associated with an input circuit identifying time slot, the input circuits having respective inputs which (E.sub.1 to E.sub.n) receive a type of data cells used in a data transmission system;
• and the input circuits having outputs (S.sub.1 to S.sub.n) connected respectively to corresponding inputs of the switching matrix (MatCom), each input circuit (CE.sub.1 to CE.sub.n) containing m additional inputs (Ea.sub.1 to Ea.sub.m) in a one-to-one relation with the outputs of the switching matrix (MatCom);
• each input (Ea.sub.1 to Ea.sub.m) of each input circuit receiving, during an identified time slot, a series of availability signals (sd.sub.1 to sd.sub.m) assigned to respective time slots which are later than the input circuit identifying time slot;
• each availability signal (sd.sub.j) indicating an availability condition at the matrix output that corresponds to the input circuit (Ea.sub.j) for the emission of a cell into the time slot assigned to that signal;
• each input circuit (CE.sub.i) having a memory for storing a cell that is present at its input (E.sub.i) at an address identifying a time slot assigned to an availability signal (sd.sub.1 to sd.sub.m) indicating an available condition for an emission of the cell at the output of the matrix (MatCom) to which the cell is addressed;
• the availability signal (sd) indicating, after the storing operation, a non-available condition;
• and reading the memory (MC) at an address corresponding to the time slot identifying the cell stored at this address for sending said cell to the switching matrix (MatCom).