<s>
ISDN-oriented	B-Protocol
Modular	I-Protocol
Interface	I-Protocol
(	O
IOM	O
)	O
is	O
a	O
system	O
architecture	O
and	O
its	O
bus	O
for	O
communication	O
between	O
various	O
VLSI	O
ICs	O
for	O
the	O
lower	O
layers	O
(	O
ref	O
.	O
</s>
<s>
OSI	O
model	O
)	O
of	O
ISDN	B-Protocol
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
Siemens	O
(	O
today	O
:	O
Infineon	O
)	O
,	O
current	O
revision	O
is	O
IOM-2	B-Protocol
.	O
</s>
<s>
IOM-2	B-Protocol
is	O
a	O
4-wire	O
serial	O
,	O
full-duplex	O
link	O
.	O
</s>
