<s>
A	O
packet-switching	B-Protocol
node	I-Protocol
is	O
a	O
node	B-Protocol
in	O
a	O
packet-switching	B-Protocol
network	O
that	O
contains	O
data	O
switches	O
and	O
equipment	O
for	O
controlling	O
,	O
formatting	O
,	O
transmitting	O
,	O
routing	B-Protocol
,	O
and	O
receiving	O
data	O
packets	O
.	O
</s>
<s>
Note	O
:	O
In	O
the	O
Defense	O
Data	O
Network	O
(	O
DDN	O
)	O
,	O
a	O
packet-switching	B-Protocol
node	I-Protocol
is	O
usually	O
configured	O
to	O
support	O
up	O
to	O
thirty-two	O
X.25	O
56	O
kbit/s	O
host	B-Application
connections	O
,	O
as	O
many	O
as	O
six	O
56	O
kbit/s	O
interswitch	O
trunk	O
(	O
IST	O
)	O
lines	O
to	O
other	O
packet-switching	B-Protocol
nodes	I-Protocol
,	O
and	O
at	O
least	O
one	O
Terminal	B-Device
Access	I-Device
Controller	I-Device
(	O
TAC	O
)	O
.	O
</s>
