haiburitsudo exchange die deijitaru signal transmission mode

摘要

PURPOSE:To improve the utilizing efficiency of a line by collecting signals from stations conducting line exchange before one frame and sending a packet from a station desiring packet exchange to a backward idle area, so as to apply line exchange and packet exchange at the same time. CONSTITUTION:At the time of a transmission request comes from a user circuit, a transmission block selection means 27 looks into the content of a line state storage device 17 read by a memory read circuit 28, the final block of a line exchange area is found out by a transmission request of line exchange and registered in a register 29. If a block number of a block counter 20 and a block number of the register 29 are coincident, a comparator 22 sends a transmission enable signal 22a to a transmission logic circuit 25. In inputting an output signal from a transmission timing generation circuit 21 and the comparator 22, the circuit 25 sends one block signal of a transmission buffer memory 31 to a transmission line 1 altogether.