Telecommunications network

PCT No. PCT/GB94/00029 Sec. 371 Date Jul. 11, 1995 Sec. 102(e) Date Jul. 11, 1995 PCT Filed Jan. 7, 1994 PCT Pub. No. WO94/16511 PCT Pub. Date Jul. 21, 1994In a telecommunications switching network which has a plurality of sub-networks, each sub-network having a plurality of User Network Ports, the Destination and Source addresses in a cell-header carrier by a cell switched by the network are each divided into a Port Address part and a Sub-Network Address part, the Source Sub-Network part being implicit while the cell remains in the Source Sub-Network and similarly the Destination Sub-Network part is implicit when the cell arrives in the Destination Sub-Network, the Source and the Destination Sub-Networks being linked via a Cross-connect switching device wherein the address formats are changed.