Abstract: A plug-in module frame has sockets (2) with at least one signal contact (7, 16) each for passing an information signal between the plug-in module frame (1) and a plug-in module (3) mounted at one of the sockets (2). A protocol converter (9, 10, 11, 12, 14, 15, 17) having first and second terminals communicates with the plug-in module (3) via its first terminal and signal contact (7, 16) ac-cording to a first protocol and via its second terminal according to a second protocol. Type detecting means (8) are provided for detecting a characteristic of a plug-in module (3) mounted in socket (2), which characteristic is unambiguously associated to a protocol supported by the plug-in module (3), and the protocol converter (9, 10, 11, 12, 14, 15, 17) which is connected to the type detecting means and supports a plurality of first protocols is adapted to use at its first terminal a protocol encoded by the detected property of the plug-in module (3) at its first terminal.

Abstract: A data transmission network comprises two groups of nodes (1; 2, 3, 4), a radio interface associated to each group and connected to the nodes (1) of the group and a radio path (5) between the two radio interfaces (9), in which several groups (1412, 1413, 1414) of virtual paths (15) of warranted bandwidth are transmitted between one node (1) of the first group and one node (2, 3, 4) of the second group. The sum of the bandwidths warranted to the groups (1412, 1413, 1414) of virtual paths does not exceed the total bandwidth of the radio path (5) when operated in a transmission mode referred to as basic mode.