AR telephone exchange

Inventory number: T99 2/15/2
Location: Hall 2

Until the end of the '60s, the Hungarian network of automatic exchanges consisted of practically obsolete rotary automated exchanges of a small spectrum (7A and 7D), and it could be expanded only with the same types. In the Hungarian network, the occurrence of the AR crossbar system of the Swedish LM Ericsson represented a great development. The indirect controlled AR exchange system (with register) consisted of electromechanical elements (crossbar switches as <<852>>crossbar machines<>, relays) but already contained - although in a small quantity (not in the switching field and not in the control system, only in the signalling system) - analogue electronic elements as well. Practically, it was a stored program controlled (SPC) (fix-wired) system. The AR exchanges did not contain parts subject to considerable wear already (as e.g. the rotary machines of the rotary exchange). Already during the domestication, matching of AR system to the existing (manual and rotary automated) exchanges was provided for. The additional advantage of the AR system was that it had and has telephone exchange of proper type for each plane of the telephone network as follows (the switching diagrams are attached): - <<897>>ARF 102<> town local exchange (capacity of max. 100,000 stations from stages 1,000) and connected to this, ARM 201 large traffic transit exchange (cross-point capacity of max. 8,000 from stages 200), also as domestic and international long-distance exchange. - Rural systems <<898>>ARK 522<> (stages 100, with a capacity of max. 2,000 stations) and <<899>>ARK 511<> (stages 30, with a capacity of max. 90 stations), and connected to this, ARM 503 low traffic transit exchange (cross-point capacity of max. 2,000). The procurement took place by purchasing license (BHG) and by purchasing goods (Hungarian Post). In the first phase the exchanges procured in the course of purchase of goods were installed. Thus, the Lágymányos ARF 102 crossbar exchange was put in operation at first (1970) then Vác (ARF +ARM) and Pécs (ARF + ARM), etc., then in the second phase, the AR exchanges produced based on BHG license; at first Cegléd ARF and ARM, Miskolc-Diósgyőr ARF 102, moreover the Budapest Belváros ARF 102 exchange. The planned replacement of the AR exchange system for the more advanced digital SPC exchanges - that can provide considerably more services and meet higher standards - is currently underway.

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