Paradyne 7520 User Manual page 70

Glossary
DSR
DSU
DTE
DTR
EIA
EIA-232
excessive BPV
factory defaults
FCC
frame relay
full-duplex
HDLC
interface
ITU
kbps
LADS
LAN
latching loopback
LB
LED
link layer protocol
LL
loopback
LSD
GL-2
Data Set Ready. A signal from the modem to the DTE that indicates the modem is turned
ON and connected to the DTE.
Data Service Unit. Data communications equipment that provides an interface between the
DTE and the digital network.
Data Terminal Equipment. The equipment, such as computers and printers, that provides
or creates data.
Data Terminal Ready. A signal from the DTE to the DSU, sent via Pin 20 of the
EIA-232 interface (V.24 circuit 108/1, /2), that indicates the DTE is turned ON and
connected to the DSU.
Electronic Industries Association. This organization provides standards for the data
communications industry to ensure uniformity of interface between DTEs and DCEs.
The EIA's standards defining the 25-pin interface between the DTE and DCE.
An excessive bipolar violation condition results when at least one invalid bipolar violation
has occurred every 20 milliseconds for 2 seconds.
A predetermined set of configuration options for general operation.
Federal Communications Commission. Board of Commissioners that regulates all U.S.
interstate, intrastate, and foreign electrical communication systems that originate from the
United States.
A high-speed connection-oriented packet switching WAN protocol using variable-length
frames.
The capability to transmit in two directions simultaneously.
High-Level Data Link Control. A communications protocol defined by the International
Standards Organization (ISO).
A shared boundary between functional units.
International Telecommunication Union, formerly known as CCITT . An advisory committee
established by the United Nations to recommend communications standards and policies.
Kilobits per second (thousand bits per second).
Local Area Data Set is used to provide a point-to-point link between two devices (also
called LDM – limited distance modem).
Local Area Network. A network designed to connect devices over short distances, like
within a building.
A loopback that is maintained until a specific release code is detected. A latching loopback
can only be initiated or terminated by the 64 kbps clear channel network service provider.
Loopback.
Light Emitting Diode. A status indicator that responds to the presence of a certain
conditions.
The protocol that regulates the communication between two network nodes.
Local Loopback. An EIA-lead standard for V.24 circuit CT 141; an input signal
(DTE-to-DCE).
Used to test various portions of a data link in order to isolate an equipment or data line
problem. A diagnostic procedure that sends a test message back to its origination point.
Line Signal Detect. An EIA-lead standard for V.24 circuit CT 109; an output signal
(DCE-to-DTE).
May 1998 7520-A2-GB20-20