o The DTE generates the data and passes it
along with any control information to a
DCE
o The
DCE converts the
signal to a
format appropriate to
the TX medium
and
introduces
it onto the network link
o When the signal arrives at the receiving
end this process is reversed
¾ DTE
o DTE
includes any unit
that functions either
as a source
of or as a
destination
for binary digital data
o At
the physical layer,
it cab a
terminal, microcomputer, computer
,
printer
or any other device that generates or consumes digital data
o DTEs
do not often
communicate with each
other directly with
each
other
o Think of DTE as your Brain.
o Your and your friends brains are DTEs
o The vocal chords or mouth are DCEs
o Air is TX Meduium
DCE
o DCE
includes any functional unit that transmits or receives data in the
form
of an analog or digital signal through a network
o At the physical layer, a DCE takes data
generated by a DTE, converts
it
to the appropriate signal and then introduces it to the comm link
o Commonly used DCEs at the physical layer
include MODEMS
o In
any n/w ,
a DTE generates
digital data and
passes it on
to a DCE,
the
DCE converts the data to a form acceptable to the TX medium and
sends
the converted signal to another DCE on the network
o The second DCE takes the signal off,
converts it to a suitable form for
its
DTE and delivers it
o To make this communication possible, the
sending and receiving DCEs
must
use the same modulation method
ŠThe two DTEs
need not be coordinated with each other but they need to be coordinated
with their
respective DCEs and
the DCEs must
be coordinated so
that data translation
occurs
w/o loss of integrity
|
|
No comments:
Post a Comment