Installation manual

COMSPHERE 3000 Series Carrier
Glossary-4 March 2001 3000-A2-GA31-F0
DCP Diagnostic Control Panel. The front panel of a device that continuously provides status
information about the device’s operation and allows an operator to manage its operation.
This is a generic term used for both the standalone and carrier-mounted models.
DDD Direct Distance Dialing. Telephone exchange service, the PSTN, that enables a telephone
service user to access telephone lines without operator assistance.
DDS Digital Data Service, such as DATAPHONE Digital Service or ACCUNET Spectrum of
Digital Services, that provides digital communication circuits.
device A standalone or carrier-installed circuit card.
Diagnostic Channel A digital interface between a DSU and a modem used to extend diagnostics to the DSU via
the modem.
Diagnostic Console A DATAPHONE II NMS that uses the DATAPHONE II protocol.
Dial A device operating on a PSTN line and requiring a dialing method and protocol to conduct
data transmission.
dial network See PSTN.
digital bridging Provides the ability for dial backup of a multipoint configuration by bridging the signal on
the digital side of the front end panel.
DIP switch Dual In-line Package switch.
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 activates the signal.
DOC Canadian Department of Communication.
downstream In extended networks, the direction in which diagnostic messages flow from the diagnostic
control site to any intermediate links and then to the final tributary modem.
DPII DATAPHONE II. The name of both a family of Paradyne DCE and NMS products (SC, DC,
and NC), and the network management protocol used by these products.
DSA Digital Switched Access (see IEC).
DSU Data Service Unit. Data communications equipment that transmits digital data over a private
line. Also used for limited distance communications over the PSTN 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 (zero). A 64 kbps digital telecommunications signal or channel.
DTE Data Terminal Equipment. The equipment, such as a computer or terminal, that provides
data in the form of digital signals.
EIA Electronic Industries Association. This organization provides standards for the data
communications industry to ensure uniformity of interface between DTEs and DCEs.
EIA-232-D An Electronic Industries Association’s standard defining the 25-position interface between
data terminal equipment and data communications equipment.