Everything about Data Terminal Equipment totally explained
Data terminal equipment (
DTE) is an
end instrument that converts
user information into signals for
transmission or reconverts received signals into user information. A DTE device communicates with the
data circuit-terminating equipment (DCE).
The DTE/DCE classification was introduced by
IBM.
A DTE is the
functional unit of a data station that serves as a data source or a data
sink and provides for the
data communication control function to be performed in accordance with
link protocol.
The data terminal equipment may be a single piece of equipment or an interconnected subsystem of multiple pieces of equipment that perform all the required functions necessary to permit users to communicate. A user interacts with the DTE (for example through a
human-machine interface), or the DTE may be the user.
Usually, the DTE device is the
terminal (or a
computer emulating a terminal), and the DCE is a
modem.
DTE is usually a male connector and DCE is a female connector.
A general rule is that DCE devices provide the
clock signal (internal clocking) and the DTE device synchronizes on the provided clock (external clocking).
D-sub connectors follow another rule for
pin assignment. DTE devices usually transmit on pin connector number 2 and receive on pin connector number 3. DCE devices are just the opposite: pin connector number 2 receives and pin connector number 3 transmits the signals.
This term is also generally used in the
Telco context to designate any device unable to generate clock signs, hence a PC to PC ethernet connection can also be called a DTE to DTE communication. This communication is done via an
Ethernet crossover cable as opposed to a PC to DCE (hub, switch, or bridge) communication which is done via an Ethernet straight cable.
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