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ACCULINK 316x DSU/CSU
Glossary-4 January 1997 3160-A2-GB21-50
downstream device A device that is connected farther from the host computer.
drop/insert An interconnection point for terminals, multiplexers, and transmission facilities.
Individual channels may be inserted into the aggregate stream or dropped out to
accommodate specific applications.
DSR Data Set Ready. V.24 circuit 107.
DSU Data Service Unit. Data communications equipment which transmits digital data
over a private line. Also used for limited distance communications over the local
area network when a high-speed modem is not needed.
DSX-1 Digital Signal Cross Connect level 1. An interconnection point for terminals,
multiplexers and transmission facilities.
DS0 Digital Signal Level 0. A 64 kbps standard signal or channel.
DS0 channel allocation Assigning specific DS0 channels in the DSU/CSU to specific interfaces (network,
DTE Drop/Insert, etc.).
DS1 Digital Signal level 1. A signal of 1.544 Mbps in North America.
DS1/E1 MIB Defines objects for managing the network and DTE Drop/Insert interfaces on the
DSU/CSU.
DTE Data Terminal Equipment. The equipment, such as a computer or terminal, that
provides data in the form of digital signals.
DTE Drop/Insert interface The Drop/Insert (DSX-1) interface on the rear panel of the DSU/CSU.
DTLB Data Terminal Loopback. Loops the data received from the selected port, for all
DS0 channels allocated to the port, back out the port.
DTMF Dual Tone Multifrequency. The basis of operation for a pushbutton telephone.
DTR Data Terminal Ready. V.24 circuit 108/1, /2.
D4 The transmission standard that specifies 12 frames as a superframe that is used for
frame synchronization and to locate signaling bits.
EDL Embedded Data Link. The 8 kbps in-band performance channel that provides
4 kbps of user bandwidth for the support of an SNMP management link.
EER Excessive Error Rate. An error rate that is greater than the threshold in the
DSU/CSU.
EIA Electronic Industries Association. An organization providing standards for the data
communication industry.
EIA 530A An EIA standard for a high-speed, 25-position, DCE/DTE interface.
Enterprise MIB MIB objects unique to Paradyne devices.
enterprise-specific trap A trap unique to Paradyne devices.
EON End of Number.
error A discrepancy between a measured or computed value or condition and the true or
specified value or condition.
ES Errored seconds. Seconds with one or more ESF error events.
ESD Electrostatic discharge. An undesirable discharge of static electricity that can
damage equipment and degrade electrical circuitry.
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.
E1 A wideband digital interface operating at 2.048 Mbps.