Troubleshooting Terminal, Printer and Serial Device Connections - Edition 4 (32022-90030)

Glossary 135
Glossary
device independence A
characteristic of the operating
system that allows users to
selectively redirect input/output
from a program, session, or job
without regard to the nature of
the device.
device name See PAD name.
Dial ID protocol A proprietary
Hewlett-Packard protocol that
provides security checking and
address exchange for dial links.
dial link A connection made
through public telephone lines.
direct-connect device An
asynchronous device that is
connected directly to a DTC
through an RS-232-C or RS-422
cable, with no intervening
communications equipment. Also
referred to as a “local connection.”
direct connection A leased line,
private line, or other
non-switched link in a network.
direct dial A dial link through
which only one remote node can
be reached.
direct-path branching The
process of directly accessing any
screen in NMMGR by entering a
path name in the Command: field.
The path name must be preceded
by an at sign (@).
download The process of loading
operating code and configuration
files into the DTC’s memory. The
DTC is downloaded by the
MPE/iX host for LANs using
host-based network management,
and by the PC for DTCs managed
by the OpenView DTC Manager.
driver Software that controls
input/output devices including
NS 3000/iX links.
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 16 HP 2340A product. A
DTC that provides 2 slots for
asynchronous connections with
each slot allowing up to 8 direct
connections or 6 modem
connections, plus an optional X.25
link supporting up to 32 virtual
circuits.
DTC 16iX HP J2062A product.
A DTC terminal server for
HP 3000 systems. It allows up to
16 asynchronous connections to
HP 3000 systems.