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{{no footnotes|date=September 2012}}
'''ISDN-oriented Modular Interface''' (IOM) is a system architecture and its bus for communication between various [[VLSI]] [[Integrated circuit|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-Lucent|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:
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==References==
* {{Cite book| year=1991 | title=ICs for Communications, IOM–2
* {{Cite book| year=1994 | title=ICs for Communications, ISDN Subscriber Access Controller for Terminals, ISAC–STE, PSB2186
* {{Cite book| last=Georg | first=Otfried | year=2000 | title=Telekommunikationstechnik | publisher=Springer | isbn= 978-3-540-66845-9
[[Category:Integrated Services Digital Network]]
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