Configuring and Managing Host-Based X.25 Links - Edition 6 (36939-90057)

Glossary
device class
Glossary
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device class A collection of devices that have some
user-defined relation. Device classes are assigned
throug h use of t he NM MGR c onfi guration utility.
device-dependent characteristic A file
specification for which modifications are restricted
because of the type of device on which the file is
opened. For example, data directed to terminals
must have a blocking factor of one.
device driver Software module that controls a
specific type of input/output device including
NS 3000/iX links.
device file A file being input to or output from any
peripheral device except a disk. MPE allows
operations to be performed on the device itself as if it
were a file.
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 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 path
names in the Command: field. The path name must
be preceded by an at sign (@).
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.
download The process of loading operating code
and configuration files into the DTC’s memory. The
DTC is downloaded by the host computer for LANs
using host-based network management, and by the
PC for DTCs managed by the OpenView DTC
Manager.
driver See device driver.
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).
DTCCNTRL A command file you can use to manage
DTS configurations. Using DTCCNTRL, you can
dynamically implement DTS changes, automatically
add a new DTC, shutdown/restart DTS, and
manage/dynamically configure host-based X.25
connections.
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 at speeds of up to 19.2 Kbps.
DTC 16iX HP J2062A product. A DTC terminal
server for HP 3000 systems. It allows up to 16
asynchronous (direct and modem) LAN connections
to HP 3000 systems.
DTC 16MX HP J2063A product. A DTC terminal
server for HP 3000 and Telnet systems. It allows up
to 16 asynchronous (direct and modem) LAN
connections for the HP 3000 environment and for
computer systems running ARPA, such as HP 9000s
and third party systems. When managed by the HP
3000, the DTC 16MX is configured and functions
exactly like a DTC 16iX. The full functionality of the
DTC 16MX is only available when it is managed by
the OpenView DTC Manager.