Configuring and Managing MPE/iX Internet Services (MPE/iX 6.0)

182 Glossary
Glossary
basis. Daemons are typically
started once, on system startup,
and they frequently start other
processes to handle service
requests. The Internet daemon
inetd is a good example of such a
process.
datagram A message consisting
of content and all of the
information needed to deliver the
content between one system and
another. Datagrams are sent
using the User Datagram
Protocol, or UDP. See also UDP.
datagram service A
connectionless service that
transmits messages, or
datagrams, from one system to
another. Because datagrams are
transmitted without relying on a
pre-established network
connection (hence the term
connectionless), each datagram
must contain all the information
required for its delivery. The
protocol associated with
datagram service is UDP, or User
Datagram Protocol. See also
datagram, protocol, and UDP.
DCE Data circuit-terminating
equipment. The interfacing
equipment required in order to
interface to data terminal
equipment (DTE) and its
transmission circuit. Synonyms:
data communications equipment,
dataset.
domain name A name
designated for a system in
ARPANET standard format. This
name can be used by other nodes
on the network to access the host
for which it is configured.
DTC Datacommunications and
Terminal Controller. The DTC is
a hardware device, configured as
a node on a LAN, that enables
asynchronous devices to access
HP 3000 Series 900 computers.
Terminals can either be directly
connected to the DTC, or they can
be remotely connected through a
Packet Assembler Disassembler
(PAD). The DTC can be
configured with DTC/X.25
Network Access cards and
DTC/X.25 Network Access
software. A DTC/X.25 iX Network
Link consists of two software
modules: the X.25 iX System
Access software (running on the
host) and the DTC/X.25 Network
Access software (running on the
DTC).
DTC Telnet Access An HP
product providing Telnet
connections from HP 9000 and
non-HP systems running ARPA
standard Telnet services to the
HP 3000. The solution includes a
Telnet Access Card (TAC) that
resides in the DTC 72MX or
DTC 48 and provides protocol
conversion between Telnet and
Avesta Flow Control Protocol
(AFCP). Equivalent functionality
is provided by a separate product,
the Telnet Express Box (TEB).
DTE Data Terminal Equipment.
Equipment that converts user
information into data
transmission signals or