The Ericsson AXE system is the most widely deployed switching system in the world. It is used in public telephony-oriented applications of every type, including traditional fixed network applications in local, transit, international and combined networks. AXE is also deployed for all major mobile standards - analogue as well as digital.
An Ericsson AXE10 exchange can be split into three main parts; these are known as APT, APZ, and IOG (called APG in later generations).
APT which handles the call switching, customer access and junction access, contains the following subsystems:
Subscriber Switching Subsystem (SSS) to provide customer access
- Trunk and Signalling Subsystem (TSS) which deals with junction access
- Group Switching Subsystem (GSS) which handles switching
- Common Channel Subsystem (CCS) which handles CCITT No 7 (C7) signalling
APZ which is responsible for the control in the exchange contains the following subsystems:
- Regional Processor Subsystem (RPS)
- Central Processor Subsystem (CPS)
IOG which handles the Input and output connections to terminals, printers, alarms, storage devices, and data links contains the following subsystems:
- Support Processor Subsystem (SPS) to supervise the operation of all IOF functions.
- Man-machine Communication Subsystems (MCS) to handle communications between input/output devices and the rest if the AXE10 exchange.
- Data Communications Subsystem (DCS) to handle communications over digital links
- File Management Subsystem (FMS)
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