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Expansion module for COMpact systems. Adds two variable ISDN ports (external/internal). When used as internal ports, either S0 (4-wire) or UP0 (2-wire) operation is possible (4 ISDN eller 2 UP0 systemtelefoner). You can connect COMfortel system telephones or any other ISDN terminal device to the internal ISDN port.
BRI = Basic Rate Interface.
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