Abstract: Multiservice packet telecommunication network in which each packet has inserted in an address field thereof a sequence of addresses respectively assigned to the successive switching network included in a route from a packet sender station to a packet receiver station and defining in these networks groups or bundles of outgoing channels. In each bundle the seizure of an outgoing channel is made by scanning and searching a free channel in the bundle.

Abstract: A switching unit for a multiplex pulse code modulation transmission system formed of incoming and outgoing multiplex digital circuits divided into a number of frame locking, information and signalling time slots. The information time slots are grouped in frames and contain information octets and the signalling time slots are grouped in multiframes and contain two signalling demi-octets. A transmission channel is defined by the recurrent information time slots having a given serial number in the frame and the octets contained therein and the recurrent signalling time slots having a given serial number in the multiframe and the first or the second demi-octets contained therein. The switching unit of the invention switches both the information octets and the signalling demi-octets of a selected transmission channel. Switching comprises writing and reading the information octets in and out of information buffer stores and writing and reading the signalling demi-octets in and out of signalling buffer stores.