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A distributed packet switching system in which a centralized switch is not used and, instead, each transmitting port contains the intelligence required to derive and then insert the destination port and station addresses into the header of each packet to be transmitted by the port. The port circuitr

A distributed packet switching system in which a centralized switch is not used and, instead, each transmitting port contains the intelligence required to derive and then insert the destination port and station addresses into the header of each packet to be transmitted by the port. The port circuitry that derives the destination addresses operates under control of a central controller which, prior to the setup of each call, receives information identifying the transmitting port and calling station as well as the destination station number dialed at the calling station. The controller processes this data to derive the destination port and station addresses. The derived addresses are sent to and stored in a RAM in the transmitting port. The RAM outputs the destination port and station addresses for each packet subsequently transmitted by the port on the call.

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In a packet switching system having a plurality of ports interconnected by a data bus: a system controller connected by a control bus and by said data bus to all of said ports, at least one station connected to each of said ports, means for applying call establishment information to a calling one of

In a packet switching system having a plurality of ports interconnected by a data bus: a system controller connected by a control bus and by said data bus to all of said ports, at least one station connected to each of said ports, means for applying call establishment information to a calling one of said ports from a connected calling station with said information including a called station number and a number identifying said calling station and a calling station off-hook indication signifying the initiation of a call, means in said calling port for transmitting information identifying said calling and called station to said controller, said controller being responsive to the receipt of said information for applying destination port and called station addresses over said control bus to said calling port, means in said calling port for subsequently receiving further information from said calling station with said further information including said calling station identification number as well as data to be transmitted over said data bus to said destination port and called station, means in said calling port responsive to the receipt of said further information for translating said received calling station identification number into said destination port and called station addresses, means in said calling port responsive to said translation for forming a packet comprising said data as well as said destination port and called station addresses, and means for applying said formed packet to said data bus for transmission to said destination port.