Refer to the exhibit. The network administrator must complete the connection between the RTA of
the XYZ Company and the service provider. To accomplish this task, which two devices could be
installed at the customer site to provide a connection through the local loop to the central office of
the provider? (Choose two.)

A.
multiplexer

B.
PVC

C.
WAN switch

D.
modem

E.
CSU/DSU

F.
ATM switch

Explanation:
DTE is an abbreviation for Data Terminal Equipment , and refers to an end instrument that
converts user information into signals for transmission, or reconverts the received signals into user
information. A DTE device communicates with the Data Circuit-terminating Equipment (DCE),
such as a modem or CSU/DSU.
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 (DTE) 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 (e.g. 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.
A CSU/DSU (Channel Service Unit/Data Service Unit) is a hardware device about the size of an
external modem that converts a digital data frame from the communications technology used on a
local area network (LAN) into a frame appropriate to a wide-area network (WAN) and vice versa.
The DSU provides an interface to the data terminal equipment (DTE) using a standard
(EIA/CCITT) interface. It also provides testing capabilities.