Communications system comprising a ring-shaped network which is provided so as to provide a communications network in the subscriber line region of a digital switching equipment

A communication system comprising, a digital switching equipment having a first local bus system by which a central controller means communicates with a switching matrix network means formed as a time-stage and with at least on communications controller, and which is equipped with a further local bus system by which the communications controller communicates with subscriber line equipment mounted in an acceptance means, a distributor means mounted in the acceptance means which distributes the bus system coming from the communications controller and at least one PCM-oriented message channel in-coming from terminals of the switching matrix network means to respectively n subscriber line equipment terminals in parallel, said subscriber line equipment are connectible respectively with m subscriber equipments by central office lines for analog or digital transmission capabilities where m and n are integers, a ring-shaped network mounted in the subscriber line region of the switching equipment as an offering network for transmitting information groups and having a ring line in which a plurality of ring coupling devices are mounted and to which a respective ring-shaped network access means is connected by a respective spur line, and whose ring-shaped network access means is connected to at least one ring network subscriber equipment, hardware equipment and software for operating, administering and monitoring switching equipments, office lines, subscriber equipments and the ring-shaped network, comprising a gateway means (GWE) formed of a converter means (UE-GW) and a ring-shaped network access means (RN-ZE) for coupling the switching equiment to the ring-shaped network (RN) mounted in an acceptance means (AE);

• said gateway means (GWE) connected to the switching equipment (VE) by said converter means (UE-GW);
• said gateway means (GWE) connected to the ring-coupling means (RCB) by the ring-shaped network access means (RN-ZE) which matches the signalling and message information to line network transmission procedures;
• at least one further ring-shaped coupling means (RCB) mounted in said ring-shaped network (RN), an external acceptance means (AEE) in which is mounted a network access means (RN-ZE) and an external converter means (UE, SLM) and to which a maximum of n subscriber equipments (SLM) are connected to said at least one further ring-shaped coupling means with a spur line (SL);
• external subscriber equipment (SE) connected to said subscriber equipment (SE) of the switching equipment network and connected to the subscriber line equipment (SLM) by central office lines;
• and said the ring-shaped network (RN) and said switching equipment network are operated, administered and monitored by said switching equipment (VE) and/or by said gateway means (GWE).