One station may transmit to every other and receive from every other, but the other stations have no communication among themselves. That is, the circuit is in effect a combination of a distribution network and a contribution network.This arrangement is used to interconnect,for example,a computer centre with outlying user stations.
ITU-T M.1055-1988 history
1988ITU-T M.1055-1988 LINING UP AN INTERNATIONAL MULTITERMINAL LEASED CIRCUIT