The X.25 NCP Packet Switching Interface (NPSI) server runs a VTAM® application program that is called XNX25IPI. XNX25IPI is the interface between the DLC driver of the TCPIP address space and your X.25 network. XNX25IPI communicates with the X.25 NPSI in a front-end IBM® 37xx Communications Controller.
Large scale X.25 network applications often require multiple physical lines to the network switch for increased capacity and reliability. You can configure the X.25 NPSI server to support multiple lines as a group rather than individually. In this configuration, the collection of lines is assigned a single address that is called a hunt group address. Incoming X.25 calls are distributed among the lines in either a rotary or traffic balancing fashion, depending on the services the X.25 network provider offers.
