Abstract: When complete, the network D(p,k,a) comprises N operators each connected to p other operators of the network, p being an even integer. The N operators are located on h generatrices each comprising (P/2).sup.k operators, h and k being any two numbers and h being equal to k+a. An operator of coordinates (i,j), i being the generatrix (1.ltoreq.i.ltoreq.h) on which the operator is located and j being the operator order number (1.ltoreq.j.ltoreq.(P/2).sup.k), is connected directly to P/2 operators Ax (1.ltoreq.x.ltoreq.P/2) of the next generatrix, the coordinates of Ax being ((i+1) modulo h, x+P/2 (j-1) modulo (P/2).sup.k).The invention applies to telecommunications centers.

Abstract: The switching circuit comprises an interface to the interior which comprises two-way gates which are connected to internal interfaces of other switching circuits of said network, each of said gates comprising a l-input and n-output receive circuit and an n-input and l-output transmit circuit, one input of the transmit circuit being connected to the output of a receive circuit different for each of the n inputs, and the input of each receive circuit of a gate being connected to the output of the transmit circuit of a gate of another switching circuit of said network.

Abstract: Methods and apparatus for converting time-division data signals received over an incoming trunk having v.sub.e channels into time-division data signals for transmission over an outgoing trunk having v.sub.s channels (where v.sub.s >v.sub.e).The device includes means for storing the data bits contained in each incoming frame; means for reading at an intermediate frequency f.sub.i, during read enable periods, the stored data bits corresponding to v.sub.e busy outgoing channels and for evenly distributing v.sub.s -v.sub.e free outgoing channels amongst the v.sub.e busy outgoing channels, during read inhibit periods; and means for transmitting at a frequency f.sub.s the data bits read at the intermediate frequency f.sub.i.This device may advantageously be used in PCM telephone exchanges.

Abstract: This invention relates to a switching system for time-division multiplexed PCM channels. The system possesses essentially an incoming time-division switching device, a space-division switching device and an outgoing time-division switching device. The invention proposes to produce these time-division switching devices in the form of memories organized in pages enabling them to be manufactured in the form of hybrid monolithic integrated circuits. Application: time-division telephone switching.