<s>
For	O
computer	B-Architecture
networking	I-Architecture
,	O
Link	B-Protocol
level	I-Protocol
:	O
In	O
the	O
hierarchical	O
structure	O
of	O
a	O
primary	O
or	O
secondary	O
station	O
,	O
the	O
conceptual	O
level	O
of	O
control	O
or	O
data	B-General_Concept
processing	I-General_Concept
logic	O
that	O
controls	O
the	O
data	O
link	O
.	O
</s>
<s>
Link-level	O
functions	O
include	O
(	O
a	O
)	O
transmit	O
bit	O
injection	O
and	O
receive	O
bit	O
extraction	O
,	O
(	O
b	O
)	O
address	B-Protocol
and	O
control	O
field	O
interpretation	O
,	O
(	O
c	O
)	O
command	B-Application
response	O
generation	O
,	O
transmission	O
and	O
interpretation	O
,	O
and	O
(	O
d	O
)	O
frame	B-Protocol
check	O
sequence	O
computation	O
and	O
interpretation	O
.	O
</s>
