Expansion with two variable ISDN ports (external/internal). When used internally, you can choose between the operating modes S0 (4-wire) or UP0 (2-wire). System telephones from the COMfortel family or other ISDN devices can be connected to the internal ISDN ports.

2 ISDN ports, switchable between external (S0) and internal (S0/UP0). Internally selectable as S0 (4-wire) or UP0 port (2-wire), multi-device connection, Euro-ISDN (DSS1). System telephone functions in conjunction with COMfortel 1200, 1400, 1600, and 2600.

With the COMpact 2BRI module, the COMpact 5000 and COMpact 5000R are expanded by two switchable ISDN ports. Both ports can be configured as external or internal ISDN ports. In internal mode, you can choose between S0 (4-wire) and UP0 (2-wire). The internal ports can operate ISDN system telephones from the COMfortel series as well as standard ISDN terminal devices.