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AXE digital telephone exchange

Inventory number: T99 2/16/2
Year of creation: 1989
Maker: LM Ericsson
Location: Hall 2

In 1990 a system selection tender was invited for procurement of the new telephone exchanges, the purpose of which was to select new telephone exchanges that are suitable both from technical viewpoint and from the aspect of price. With its exchange system type AXE (Automatic Cross-Connection Equipment), one of the winners of the tender was the Swedish LM Ericsson company. The AXE exchange is a stored program controlled (SPC) electronic, digital switching system that consists of electronic elements exclusively, as far as its control, switching field and monitoring system are concerned and does not contain parts subject to wear (as the electro-mechanic exchanges do). The control functions are performed by a system that is similar to a heavy-duty computer; the control operations can be re-written and amended in compliance with the service requirements. Under SPC — that is the stored program control — pre-specified (pre-programmed) control operations are meant, out of which just those corresponding to the actually used service will be implemented during the operation. At first, the control sets up the switching route, then the subscribers will be connected to it. The voice route is established this way, or, if the called party is busy, the calling party will be informed. The AXE switching system is well matched both to the switching and the transmission environment. In the exchange system all exchange types are included that are suitable for providing local (main exchange and remote switching unit), transit (local and long-distance), rural, as well as mobile service (mobile telephone) functions. Accordingly, the AXE system has proper exchange types for each plane and for each traffic situation of the network. The line capacities that can be built in are considerably greater than the capacity of the electro-mechanic exchanges. The capacity that can be implemented in a particular exchange is practically limited by the economic profitability only. For the AXE exchanges, the system support is resolved at proper level. In Hungary, the first AXE exchange was put in operation on 7 March 1989 in the International Direct Distance Dialling Exchange, for the long-distance transit (direct distance dialling) traffic only. Major AXE exchanges in Budapest are the following: Kelenföld and Gazdagrét, and in the country-side: Gyöngyös, Szentendre, Szekszárd, etc.

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