Packet switching system

A packet switching system, comprising:

• a plurality of input line processors;
• a plurality of output line processors;
• a plurality of input buffers including a plurality of queue buffers, being provided corresponding to the output line processors, and being connected to the input line processors;
• a crossbar switch being connected to the input buffers and the output line processors;
• an arbiter to arbitrate for assigning grant of transmitting a packet to said crossbar switch, to any of queue buffers to the queue buffers;
• and
• means to determine priority as a parameter between an interval of time for a packet to be transmitted to the crossbar switch from said queue buffer and a queue length of said queue buffer, both are calculated for each queue buffer of said queue buffers, to thereby select a queue buffer among all queue buffers in the input buffers and give the selected queue the grant for transmitting a packet to said crossbar switch,
• wherein said arbiter performs arbitration according to said priority determined on all queue buffers of the input buffers, and
• wherein the arbitration is performed based on a transmit priority level calculated by the equation of L=(1/In(e x (M-a*t)/(b*s))) ×15, where L is the priority level, M is the time out, t is output data interval, s is the number of segments at present time, a is output data coefficient, and b is queue length coefficient.