Circuit arrangement for a communications system for the transmission of message information from narrowband and broadband terminal equipment within a local network constructed as a loop

Claim 1

In a circuit arrangement for a communications system for the transmission of serial bit message information, particularly multiplex data transmission in optical transmission systems comprising light waveguides, the circuit arrangement being of the type comprising a loop local network including broadband and narrow band terminals adapted to different types of data transmission with respect to quantity of data transmission and data transmission rate within a frame and the method of transmission, the improvement comprising: a plurality of loop sub-networks in the loop local network, each of said loop sub-networks comprising at least one broadband terminal and a plurality of narrow band terminals serially connected via light wageguides and supplementing one another up to the maximum data quanity with respect to the maximum quantity of data to be transmitted in a frame within a predetermined time; a centrally-controlled broadband space switching matrix device; a plurality of sub-loop interface devices each including first and second transmitting outputs and first and second receiving inputs, said first transmitting output connected to said broadband space switching matrix device and to said first receiving input of an adjacent sub-loop interface device, said first receiving input connected to said broadband space switching matrix device, and said second transmitting output and said second receiving input connected to the light waveguides of the respective loop sub-networks and each of said interface devices acquiring the data of said broadband and narrow band terminals; each of said sub-loop interface devices comprising a frame matching unit for augmenting transit time in the respective loop sub-netwoork to a whole multiple of the frame duration, and a multiplex device for combining the data received from said broadband space switching matrix device and the adjacent sub-network to form a new, complete frame; and a central narrow band station connected in one of said loop sub-networks and connected to and controlled by said broadband space switching matrix device to control call setup and clear down between said broadband terminals via said broadband space switching matrix device.