AT&T Merlin II Feature Module 2 Data Communications Manual page 8

DEFINITIONS OF BASIC
TERMS
Analog
Designed to transmit
waves. Analog voice terminals such as the 10-button
and 34-button deluxe models can be directly connected
only to analog jacks at the control unit.
Basic Telephone Connects basic telephones and data communications
and Modem devices, such as modems, to analog station jacks at
Interface (BTMI)
the MERLIN II control unit.
Call Progress Messages sent to a computer or data terminal from the
Messages control unit, data module, modem, or data stand.
These messages tell the user how calls are proceeding.
If a call can't go through, an explanatory message
such as Incompatible Far End appears.
Control Unit The master component in the MERLIN II system. It
manages all call traffic for the system and controls all
system responses.
Data A device used to transmit binary data to and/or from a
Communications communication channel.
Equipment (DCE)
Data Hunt Group A group of digital station jacks that are assigned a
common access number. When a call is placed to a
data hunt group, the system checks the jacks in
round-robin fashion and connects the call to the first
one available.
Data Metering A feature of a data stand that allows it to
communicate with another DCE or DTE (see Data
Terminal Equipment below) device at a rate lower
than the rate set for the terminal to which the data
stand is connected.
Data Module
A general term used in this guide to refer to the
Modular Processor Data Module (MPDM) and the
Modular Trunk Data Module (MTDM).
Data Rate or Speed The rate at which digital data signals are sent between
data communications equipment and/or data terminal
equipment. For example, the data rate of a modem
that transmits at 1200 bits per second (bps) is 1200.
Data Stand A device that provides a DCE interface when
connected to a 7406 voice terminal for a data terminal
or personal computer.
Data Terminal A device used to convert character information to
Equipment (DTE) and/or from binary data.
Digital Designed to transmit signals as a sequence of separate
electrical pulses. Digital voice terminals such as the
7406 model and digital personal terminals such as the
PT51OO can be directly connected only to digital jacks
at the control unit.
as continuous electrical
signals
Data Communications with the MERLIN II System 1-5