Patent ID: 7080184

Claim:
An interface unit disposed between an integrated services digital network (ISDN) based bus and a processor bus, wherein data in the ISDN-based bus is transferred in ISDN frames divided into a plurality of timeslots, the ISDN-based bus comprises an ISDN-oriented modular bus in which data is transferred in common channels which prevents all timeslots of an ISDN frame from being accessed, the interface unit comprising: a data transfer unit includes a processor bus interface coupled to a processor bus, the processor bus interface includes a processor buffer, an ISDN bus interface coupled to an ISDN-based bus, the ISDN bus interface includes an ISDN buffer; and a control unit coupled to the data transfer unit for controlling the transfer of data between the processor bus and ISDN-based bus, wherein the interface unit facilitates communication between a device coupled to the ISDN-based bus and a device coupled to the processor bus, the interface unit is capable of accessing all timeslots in an ISDN flame for data transfer.