The AXE telephone exchange is a product line of circuit switched digital telephone exchanges manufactured by Ericsson , a Swedish telecom company. It was developed in 1974 by Ellemtel , a research and development subsidiary of Ericsson and Televerket . The first system was deployed in 1976. AXE is not an acronym , but an Ericsson product code.
17-751: APZ may refer to: APZ, the dual processor system of the AXE telephone exchange Area Planning Zones in the Bangalore Metropolitan Region Development Authority IATA airport code for Zapala Airport Asoziale Parasiten-Zonen, in the Anarchist Pogo Party of Germany Asia Pacific Zone of the International Wine and Food Society Async Pan and Zoom function of Firefox OS APZ (Abnormal Mental States) questionnaire ,
34-400: A graphical notation. The Specification and Description Language provides both a graphical Graphic Representation (SDL/GR) as well as a textual Phrase Representation (SDL/PR), which are both equivalent representations of the same underlying semantics. Models are usually shown in the graphical SDL/GR form, and SDL/PR is mainly used for exchanging models between tools. A system is specified as
51-520: A psychometric scale for assessing subjective experiences of altered states of consciousness Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title APZ . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=APZ&oldid=1040634180 " Category : Disambiguation pages Hidden categories: Short description
68-402: A set of interconnected abstract machines which are extensions of finite-state machines (FSM). The language is formally complete , so it can be used for code generation for either simulation or final targets. The Specification and Description Language covers five main aspects: structure, communication, behavior, data, and inheritance. The behavior of components is explained by partitioning
85-521: Is a specification language targeted at the unambiguous specification and description of the behaviour of reactive and distributed systems . The ITU-T has defined SDL in Recommendations Z.100 to Z.106. SDL originally focused on telecommunication systems; As of 2016 its current areas of application include process control and real-time applications in general. Due to its nature it can be used to represent simulation systems without ambiguity and with
102-471: Is a state machine that contributes to the action carried out by the system. A message stimulus coming from the environment or from another agent to an agent is called a signal. Signals received by a process agent are first placed in a queue (the input port). When the state machine is waiting in a state, if the first signal in the input port is enabled for that state it starts a transition leading to another state. Transitions can output signals to other agents or to
119-681: Is different from Wikidata All article disambiguation pages All disambiguation pages AXE telephone exchange The AXE is the digital successor to the AKE analogue telephone exchange and ARF/ARM family of crossbar switches . The design is modular with an APZ dual processor running in sync mode, an APT switching part and an APG I/O part. It is used for connecting local landlines , operating mobile networks ( TDMA , GSM , CDMA , W-CDMA , PDC ), international telephony traffic and signaling. AXE based equipment are being used as BSC/TRC, MSC, HLR, SCP, FNR, TSC, STP and wireline nodes. The brain of
136-399: Is made of functional blocks and each block can be further decomposed in sub-blocks. The lowest level block is composed of one process or several processes described as finite-state machines. [REDACTED] Blocks are connected through channels that carry the messages (or signals) exchanged between the blocks. A block agent consists of process agents. [REDACTED] Each process agent
153-474: Is on a blade cluster system capable of handling up to 8 million subscribers. The core of the switching part was the Group Switch, initially a time-space-time multiplexer capable of switching up to 64K positions or connections. This Group Switch later evolved to a Distributed Group Switch using Time-Space switching technique with a maximum capacity of 512K. AXE nodes have evolved as a traffic controller, having
170-441: Is the start transition that initializes the local variable. A connection request message conReq is sent, a 5 seconds timer conReqTimer is started, and the state machine goes to the connecting state. In the connecting state if the timer goes off -that is equivalent to a message receive- the connection request is sent again up to 10 times. If a connection confirmation is received the state machine goes to connected state. This
187-418: Is the latest version, an updated version of SDL-2000 that was completely based on object-orientation, rather than description by transformations. This version is accompanied by a UML -Profile: ITU-T Recommendation Z.109 (04/12), SDL-2010 combined with UML. SDL-2010 also introduced the support of C data types as initially introduced by SDL-RT. The hierarchy level of SDL is structured as follows. An SDL system
SECTION 10
#1733086287987204-741: Is written in PLEX (a proprietary programming language tied to the AXE hardware, designed by Göran Hemdahl), SDL and ASA210C programming languages. Code for Regional Processors (controlling hardware Extension Modules) is written in ASA210R. AXE switches used in the United Kingdom are sometimes referred to as System Y as they were the first competitive alternative to the domestically developed System X digital switching system. Specification and Description Language Specification and Description Language ( SDL )
221-487: The AXE system is a dual processor system called APZ. It runs in parallel sync mode making it fault redundant. The family of APZs started with APZ 210 03 in 1976; the latest one is APZ 214 03. The parallel sync mode was partly abandoned in the APZ 212 40 and subsequent models and has been replaced with a warm standby scheme. The latest APZ type is 214 03 which is used as MSC, TSC and HLR Blade in AXE. The latest implementation of AXE
238-402: The environment. A process agent is allowed to contain procedure types so that the same actions can be invoked from different places. It is also allowed to call a remote procedure type to invoke a procedure in another agent (or even another system) and wait for a response. [REDACTED] In this example MyVariable is of type INTEGER and is the only variable in the process. The first transition
255-580: The new Media Gateway node running on CPP platform handle the payload traffic. Ericsson AXE telephone exchanges support lawful intercepts via the remote-control equipment subsystem (RES), which carries out the tap, and the interception management system (IMS), software used for initiating the tap, which adds the tap to the RES database. In a fully operating lawful interception system the RES and IMS both create logs of all numbers being tapped so that system administrators can perform audits to find unauthorized taps. Code
272-505: The system into a series of hierarchies. Communication between the components takes place through gates connected by channels. The channels are of delayed channel type, so communication is usually asynchronous, but when the delay is set to zero (that is, no delay) the communication becomes synchronous. The first version of the language was released in 1976 using graphical syntax (SDL-76). This was revised in 1980 with some rudimentary semantics (SDL-80). The semantics were refined in 1984 (SDL-84),
289-453: The textual form was introduced for machine processing and data was introduced. In 1988, SDL-88 was released with a formal basis for the language: an abstract grammar as well as a concrete grammar and a full formal definition. The version released in 1992 (SDL-92) introduced object-oriented concepts such as inheritance, abstract generic types etc., with the object-oriented features described by transformations into non-object oriented ones. SDL-2010
#986013