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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Data Communications
Page 5-3Terminology
5
Terminology 5
The following terms are used in this chapter:
■ Data Station. A hardware configuration used to send and receive data
(and sometimes voice signals, depending on the equipment). The
configuration includes data terminal equipment (DTE) for input and output
of data, and data communications equipment (DCE) to enable the
transmission of data over digital or analog telephone lines and trunks.
There are two types of data stations:
— Modem Data Station. Connects to the control unit through an
analog extension jack or a T/R jack and requires a modem. Analog
data stations can support analog data and analog voice, analog
data only, or analog data and MLX voice.
— ISDN Terminal Adapter Data Station. Connects to the control unit
through an MLX extension jack and requires an ISDN terminal
adapter (such as the Ascend Pipeline 25PX or 50). ISDN terminal
adapter data stations can support ISDN terminal adapter data and
MLX voice or ISDN terminal adapter data only.
■ Data Terminal Equipment (DTE). Data station equipment, for example, a
PC, host computer, or LAN workstation, from which data is input and/or
output. DTE, which can also be referred to as a data terminal, uses data
communications equipment (DCE) to transmit and receive the digital
signals it requires.
■ Data Communications Equipment (DCE). Data station equipment that
enables the transmission of data over digital or analog telephone lines and
trunks. DTE requires DCE as follows:
— Modem. A type of data communications equipment that converts
the DTE’s outgoing digital signals into analog signals for
transmission over regular (analog) telephone company lines.
Another modem at the receiving data station converts the analog
signals back into digital signals for reception by the DTE (for
example, a PC). An analog data station uses a modem as its DCE.
— ISDN Terminal Adapter. A type of data communications equipment
that transmits digital signals over digital telephone company
facilities, for example, PRI. A digital data station uses an ISDN
terminal adapter (such as the Ascend Pipeline 25PX or 50) as its
DCE.
■ Data Terminal. Data station equipment (for example, a PC, host computer,
LAN workstation, Group IV fax machine, or a group video conferencing
installation) from which data is input and/or output. A data terminal uses
data communications equipment (DCE) to transmit and receive the digital
signals it requires.