(One of the main features of the CME20 mobile communication system is the use of Ericsson's shared network AXE10 (AXE for short) switching technology. Ericsson's mobile communication system, whether it is analog or digital, is a use system of AXE, which is terminated by adding and subtracting corresponding subsystems and function blocks on the basis of AXE10 switch. The advantage of this is that the mobile communication system can share the sophisticated technology of AXE technology)