Filter
Top Products
Glossary
Glossary-33000-A2-GA31-80 December 1994
Diagnostic Console An AT&T DATAPHONE II NMS that uses the DATAPHONE II protocol.
DIP switch Dual In-line Package switch.
Direct Distance Dialing
(DDD)
Telephone exchange service, the public switched telephone network (PSTN), that
enables a telephone service user to access telephone lines without operator
assistance.
D-lead control A control signal method which causes the associated modem to go off-hook in the
Originate mode. With D-lead control signaling, a single signal lead is associated
with each modem. Momentary connection of this lead to common ground actuates
the signal.
DMC Diagnostic MicroComputer. The network management protocol used by AT&T
Paradyne ANALYSIS 6510 NMS.
DSU Data Service Unit. Data communications equipment which transmits digital data
over a private line. Also used for limited distance communications over the PSTN
when a high-speed modem is not needed.
DOC Canadian Department of Communication.
EIA Electronic Industries Association. This organization provides standards for the data
communications industry to ensure uniformity of interface between DTEs and
DCEs.
extended network The extension of a circuit where the tributary DCEs are connected to an extended
control DCE. (Also called a tail circuit or an off-network extension.)
FCC Federal Communications Commission. Board of Commissioners that regulates all
interstate and foreign electrical communication systems that originate from the
United States.
IEC InterExchange Carrier. A company that provides inter-LATA (local exchange
carrier) telecommunications services, like AT&T, MCI , and US SPRINT . Access
to these services can be provided through DDS dedicated channels, T1.5 dedicated
access channels, or digital switched access (DSA) channels.
LADS Local Area Data Set (also called a limited-distance modem).
LATA Local Area Transport Area. A region served by a local exchange carrier (LEC) that
consists of one or more area codes.
LCD Liquid Crystal Display. A thin sandwich of two sealed glass plates containing liquid
crystal material. When voltage is applied, the amount of light able to pass through
the glass plates is altered so that messages may be ‘‘written” on the display.
LEC Local Exchange Carrier. A company that provides intra-LATA (local exchange
carrier) telecommunications services, like NYNEX or Bell South.
LED Light-Emitting Diode. A light or status indicator on the control panel that glows in
response to the presence of a certain condition (e.g., Alrm).