ADTRAN DSU III ARdc User Manual page 119

DATAMATE
An ADTRAN designed and manufactured device that provides a hand-held means of
configuring the SMART 16 shelf. The DATAMATE plugs into the front of the controller
card and provides a 2x16 LCD display and full numeric keypad.
data service unit
DSU. A device designed to transmit and receive digital data on digital transmission facil-
ities.
digital data service
DDS (also called Digital Data System). A private line digital service, for transmitting data
end-to-end at speeds of 2.4, 4.8, 9.6, and 56 kbps and in some cases 19.2, 38.4, or 64 kbps.
The systems can use central hub offices for obtaining test access, bridging legs of multi-
point circuits, and cross connecting equipment. DDS is offered on an inter-LATA basis by
AT&T and on an intra-LATA basis by the Bell operating companies.
data set ready
SR. A signal on the EIA-232 interface that indicates if the communication is connected
and ready to start handshaking control signals so communication can begin.
data terminal equipment
DTE. In the EIA-232C standard specification, the EIA-232C is connected between the
DCE and a DTE. The main difference between the DCE and the DTE is that pins two and
three are reversed.
dB
Decibel. A unit of measure of signal strength, usually the relation between a transmitted
signal and a standard signal source.
DTE to loop rate matching
A feature designed into ADTRAN DSU/CSU products that allows slower DTE devices to
communicate over 56/64 kbps digital circuits.
DTR
Data terminal ready. A control signal sent from the DTE to the DCE that indicates the
DTE is powered on and ready to communicate.
61200270L1-1 DSU III ARdc User Manual
Glossary
Glossary-7