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Glossary
GL-2
February 2001 8784-A2-GB20-30
DSR
Data Set Ready. A signal from the modem to the DTE that indicates the modem is turned
ON and connected to the DTE.
DSX-1
Digital Signal Cross Connect level 1. An interconnection point for terminals, multiplexers
and transmission facilities.
DTE
Data Terminal Equipment. The equipment, such as a computer or terminal, that provides
data in the form of digital signals for transmission.
DTLB
Data Terminal LoopBack. Loopback mode that loops the data for a particular synchronous
data port back to the port just before it is combined with the rest of the T1 data stream.
DTR
Data Terminal Ready. A signal from the DTE to the modem, 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 modem.
E1
A wideband digital interface operating at 2.048 Mbps, defined by ITU recommendations
G.703 and G.704. It is used primarily outside North America.
EER
Excessive Error Rate. An error rate that is greater than the threshold that has been
configured in the device.
EIA-530-A
An Electronic Industries Association standard for a high-speed, 25-position, DCE/DTE
interface.
EOC
Embedded Operations Channel. An in-band channel between DSL devices, used for
8 kbps management data.
ES
Errored Seconds. A second with one or more error events (one or more CRC error events or
OOFs).
ESF
Extended SuperFrame. The T1 transmission standard that specifies 24 frames as an
extended superframe to be used for frame synchronization and to locate signaling bits.
Ethernet
A type of network that supports high-speed communication among systems. It is a widely
implemented standard for LANs. All hosts are connected to a coaxial cable where they
contend for network access using a Carrier Sense, Multiple Access with Collision Detection
(CSMA/CD) paradigm.
ETSI
European Telecommunications Standardization Institute. An organization that produces
technical standards in the area of telecommunications.
factory defaults
A predetermined set of configuration options containing the optimum settings for operation
on asynchronous dial networks.
FAS
Frame Alignment Signal. A loss of frame (LOF) error detection.
FAW
Frame Alignment Word. A loss of synchronization error detection.
FCC
Federal Communications Commission. The Board of Commissioners that regulates all
electrical communications that originate in the United States.
FDL
Facility Data Link. The selected framing bits in the ESF format used in a wide-area link that
are used for control, monitoring, and testing.
FEBE
Far-End Block Error. Block errors reported by remote equipment.
frame
One identifiable group of data bits that includes a sequence of bits for control and
identification information.
framer
A program or device that assembles and disassembles frames.
frame relay
A high-speed connection-oriented packet switching WAN protocol using variable-length
frames.