Programme-coutrolled digital exchange method and exchange device for realizing data exchange

It is a program - controlled digital switching method for controlling multi-stage switching network for data exchange, including the following steps: Each group set up a resource pool, install and maintain an idle time slot pointer pointing to the last idle time slot of the resource pool and an application time slot pointer pointing to the first idle time slot. In the process of program - controlled exchange, in succession and intermittent process maintains the pool resources pool. In succession process, uses idle time slot pointer and application time slot pointer to apply for idle time slotfrom the pool of resources, in the process of intermittent uses idle time slot pointer to release time slot form the resource pool. The invention provides a pool of resources used to manage the application and release of time slot to conveniently complete succession and intermittent process to realize block-free exchange suitable to multi-stage exchange network.