Abstract: A central switching facility is constituted by two switching networks connected to each of the connection units via two connection circuits. A connection circuit selects on a timeslot-by-timeslot basis which output network link is to be used for conveying each time slot to the connection unit. On an instruction from the switching network, a connection circuit operates, in a message mode, on one of the time slots selected from those which it processes, and it sends monitoring information to the switching network via control bits in that time slot. An instruction bit, selecting a message mode or a normal mode, is included in each frame transmitted from the switching network to a connection circuit.

Abstract: A method for the vegetative propagation of the sea kale species is described. Buds are obtained from in vitro neoformation on a callus, which in turn is obtained from fragments of petioles or leaf laminas of the plant. The rootless plants are then micropropogated in vitro in a plant culture medium and cytokinines in the absence of auxins. The rootless plants bearing one or two leaves are cultured in vitro in a plant growth broth and one or more auxins in the absence of cytokinins until roots develop. The rooted plants are transferred to a solid plant growth substrate and bred under conditions of a natural photoperiod of illumination until a plant is obtained which is capable of growth in the field.