A general architecture of ATM switching networks which are non-blocking at call level

The simplest approach to compose a very large scale asynchronous transfer mode switching network is to compose it with only buffered unit switches. A practical architecture of such a switching network is studied and a generalized parallel delta network is proposed. It is composed by only one kind of n×n unit switch. The number of stages does not necessarily depend on the scale of the entire switching network. It is nonblocking at call level, and good cell-level traffic performance is expected. It is also very fault tolerant