Paradyne COMSPHERE 3610, Operator'S Manual

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Glossary
Glossary-3 3610-A2-GB91-90 July 1999
Data Communications
Equipment
(DCE) A device, such as a DSU or modem, that provides an interface between a DTE
device and a digital or dial/analog network (also called data circuit-terminating
equipment).
Data Set Ready
(DSR) A signal from the modem to the computer that indicates that the modem is turned
on and connected to the computer.
data router A sophisticated circuit switch in the DSU that is capable of connecting several
communication interfaces in more than one way, redirecting or routing data to an
alternate path.
Data Service Unit
(DSU) A DCE device that interprets, interfaces, and provides timing and signal control
between a DTE device and a digital network.
Data Terminal Equipment
(DTE) The equipment, such as a computer, terminal, or peripheral device, that provides
data in the form of digital signals.
DATAPHONE II
(DPII) The name of both a family of AT&T DCE and NMS products (SC, DC, and NC),
and the network management protocol used by these products.
DBM The optional Dial Backup Module for the 3600 Series DSU. This module provides
an alternate data path in case of failure of the digital connection. Three types of
DBMs are available: V.32 DBMs (14.4 kbps) or DBM-V for backup through the
PSTN (dial network), 4-wire Switched 56 DBMs or DBM-Ss for backup through
the 4-wire Switched 56 digital service, and 2-wire Switched 56 DBMs or DBM-Ds
for backup through the 2-wire Switched 56 digital service. (The 4-wire Switched 56
DBMs and DBM-Ss are only available for use in the U.S.)
DBM-D A carrier-mounted dial backup unit that provides automatic dial backup and service
restoration of failed digital circuits using 2-wire access over 56 kbps switched
digital services. The unit functions as a DBM, not as a DSU.
DBM-S A carrier-mounted dial backup unit that provides automatic dial backup and service
restoration of failed digital circuits using 4-wire access over 56 kbps switched
digital services. The unit functions as a DBM, not as a DSU.
DBM-V A carrier-mounted V.32 dial backup unit that provides automatic dial backup and
service restoration of failed digital circuits over the Public Switched Telephone
Network (PSTN). The unit functions as a DBM, not as a DSU.
DDS Digital Data Service, such as DATAPHONE Digital Service or ACCUNET
Spectrum of Digital Services, that provides digital (not dial) communication
circuits.
dedicated backup A dial backup module (DBM) assigned to a particular DSU that is continuously
available for service restoration. The DBM switches to Dial Backup mode
automatically when the DDS line fails; no switching is required. An external dial
backup unit can also provide dedicated backup, while a DBM-V, DBM-S, or
DBM-D can provide backup to multiple DSUs.
Diagnostic Channel
(DC) A serial interface between a DSU and a modem, used to extend the NMS
diagnostics from the tributary to its extended control.
Diagnostic Console An AT&T NMS that uses the DATAPHONE II (DPII) protocol.