HP 9000 Series 700, Manual

Page: 205 / 222

205
D
D
Data
communications and
Terminal Controller See DTC.
datagram A self-contained packet that is independent of other packets. It does not require an
acknowledgment and it carries information which is sufficient to route it from the
source device to the destination device. The DTC Manager/UX uses HP-proprietary
datagram protocols.
DDFA DTC Device File Access utilities. A set of HP-UX utilities used by systems and
user-written applications to programmatically access devices attached to DTC ports.
DDP Direct Distribution Panel. A distribution panel that serves as the electrical and
physical interface between a DTC 72MX MUX board (asynchronous processor
board) and up to eight asynchronous devices for direct connections. See MDP for
modem connections.
dedicated printer A printer that can be used only by one host on the LAN—the one specified in the
destination node name in that printer port's configuration screen.
destination node
name In DTC configuration, it is either 1) the name of a host that a user can be connected
to by default (if switching is not enabled for that user, or if automatic modem
connection is enabled), or 2) the name of the only host that can access a dedicated
printer.
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 file A file being input to or output from any peripheral device except a disk. HP-UX
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 irrespective of the nature of the device.
device name See device file.