Data Terminal Equipment (DTE)
The user equipment that is joined to a data communication
network. It could be anything from a simple terminal to a large
computer system. The CCITT recommendation X.25 specifies
the interface between data terminal equipment and data circuit
terminating equipment.
D Channel The packet-switched channel on a DSL at 16 Kbps, or an PRI at
64 Kbps that carries signaling messages and packet switched
user data.
DCI Dual Channel Interface.
Delay As applied to packet switching, the additional time introduced
by the network in delivering a packet’s worth of data compared
to the time the same information would take on a direct line.
DFC Disk File Controllers.
Digital Line and Trunk Unit 2 (DLTU2)
The DRM’s DLTU2 provides the interface to digital trunks and
lines such as T1, EDSL, and remote line units.
DIP Dual Inline Package.
Direct Connect PIDB (DPIDB)
An interface in the ISLU2 that carries user and control
messages from the ISLU2 to the PSU2.
Directory Routing Technique for routing information through a network based on
directories (instructions) kept in the memory of each switch.
DRM Distinctive Remote Module.
DS1 The common terminology for T-carrier that multiplexes 24
channels into a single 1.544 Mbps bit stream.
DSL Digital Subscriber Line. See Basic Rate Interface.
DSU2 Digital Service Unit 2.
EADAS Engineering and Administrative Data Acquisition System.
EAI Emergency Action Interface.
ECD Equipment Configuration Database.
EIA The Electronic Industries Association (EIA) is a trade
organization that represents a large number of U. S. electronic
manufacturers.
Equal Access (EA) This is a point where inter-LATA customers access the exchange
to request connection across the network boundaries. This is
sometimes referred to as "Equal Access."
Error Detection The process of using information added to a data transmission
to detect the presence of errors in the received information.
ESS
™
Switching System
A generic term for the switching facilities in commercial
networks utilizing computer-like processors rather than purely
electromechanical switching relays.
GLOSSARY 235-200-150
May 2003
Page G-4 Issue 3.00
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