Abstract: A method and apparatus which relate to a digital telecommunication system in which information is transferred between terminals (T1-Tn) connected to a telephone exchange for establishing a ring with the aid of a loop connection to enable sending data between arbitrarily selected terminals. Each of the terminals includes at least one send channel and one receive channel.Such a telecommunication system includes a plurality of terminals connected via time multiplexed channels to an exchange of the stored program control type (SPC), in which the switching functions are controlled by software. The terminals may have telephone sets, display units, etc. Control units and separate computers can also be connected to the exchange. A transfer with the aid of the exchange is made, from an arbitrary terminal to the next terminal in a serial loop or ring irrespective of between which terminals connection is desired. The information to be sent from one terminal to another thus goes via all terminals connected to the loop.