Glossary
Glossary-53610-A2-GB46-60 December 1996
DSR Data Set Ready. A signal from the modem to the DTE that indicates the modem is turned ON and
connected to the DTE.
DSU Data Service Unit. Data communications equipment that provides an interface between the DTE and the
digital network.
DTE Data Terminal Equipment. The equipment, such as a computer or terminal, that provides data in the form
of digital signals.
DTR Data Terminal Ready. A signal from the DTE to the modem, sent via Pin 20 of the EIA-232 interface, that
indicates the DTE is turned ON and connected to the modem.
EBrdg Extended digital bridge.
EDP Escape-based diagnostic protocol.
EIA/TIA Electronics Industries Association/Telecommunications Industry Association. This organization provides
standards for the data communications industry to ensure uniformity of the interface between DTEs and
DCEs.
EIA/TIA-232-E An Electronic Industries Association’s standard defining the 25-pin interface between data terminal
equipment and data communications equipment.
elastic store A form of buffering between collocated data communications devices in complex networks; required to
maintain timing synchronization for data transmission in the entire network.
End to End Test A pattern test run in both directions simultaneously on local and remote devices.
EPROM Erasable programmable read-only memory.
errored second A performance measurement reported during Digital Test or Transmit Test Pattern that is defined as a
second in which at least one error has been detected.
extended network The extension of a circuit where the tributary DCE is connected to a downstream (extended) control DCE.
FA Facility Alarm. A failure reported to the front panel when there is a facility or device failure.
FacB Factory Bridge. Factory default configuration option settings.
FacC Factory Control. Factory default configuration option settings.
FacT Factory Tributary. Factory default configuration option settings.
factory defaults A predetermined set of configuration option settings for a specific set of hardware features.
fallback Retraining at a lower rate or speed.
fast select An extended data field used on some packet types for x.25 facility.
FCC Federal Communications Commission. Board of Commissioners that regulates all U.S. interstate,
intrastate, and foreign electrical communication systems that originate from the United States.
FEP Front-End Processor. A communications computer associated with a host computer that manages the lines
and routing of data through the network.
ferrite choke A ferrite choke is attached to a cable to reduce electromagnetic interference and ensure compliance with
FCC Part 15 Rules.
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