Harman Patil (Editor)

ISDN oriented Modular Interface

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ISDN-oriented Modular Interface (IOM) is a system architecture and its bus for communication between various VLSI ICs for the lower layers (ref. OSI model) of ISDN. It was developed by Siemens (today: Infineon), current revision is IOM-2. Its purpose is to enable modularity. Second sources are AMD, Alcatel, Plessey.

IOM-2 is a 4-wire serial, full-duplex link. 2 operation modes are available: line card mode and terminal mode; which differ only in number and purpose of the channels. Signals are:

  • DCL (data clock, 16 kHz * N, where N = number of channels)
  • FSC (frame sync, 8 kHz)
  • DU (data upstream)
  • DD (data downstream)

    • References

    ISDN-oriented Modular Interface Wikipedia
    (Text) CC BY-SA