Dual testing system for supervising duplicated telecommunication equipment

A dual testing system for supervising the performance of two substantially identical assemblies of telecommunication equipment served by respective sets of ancillary units, comprising:

• a pair of mutually independent and substantially identical command sections each comprising a processor programmed to transmit outgoing messages to designated ancillary units of either of said sets and to receive incoming messages from said ancillary units;
• a pair of mutually independent and substantially identical monitoring sections each including one of said assemblies and the associated set of ancillary units;
• a transmitting path in each of said command sections for outgoing messages originating at the processor thereof, said transmitting path having a pair of parallel outgoing branches each leading to one of said monitoring sections;
• a receiving path in each of said command sections for incoming messages destined for the processor thereof, said receiving path having a pair of parallel incoming branches each extending from one of said monitoring sections;
• check means connected to said transmitting paths for determining the performance of said processors;
• first routing means in each of said monitoring sections for selectively directing said outgoing messages from either of said processors, under the control of said check means, to designated units in the corresponding set of ancillary units and
• second routing means in said command sections for directing any incoming message from either of said sets of ancillary units to both said processors.