Troubleshooting Terminal, Printer, and Serial Device Connections - Edition 5 (32022-90058)

Glossary
Q bit
Glossary
126126
Q
Q bit Qualified bit. When set in DATA packets the Q
bit signifies that the packet’s user data is a control
signal for the remote device, not a message for its
user.
QuickVal A software program that tests whether
Network Services are operating correctly between
nodes.
R
RDBA Remote Data Base Access. A network service
that allows users to access data bases on remote
nodes.
reachable network A network that can be
accessed (with additional internet hops possibly
required) by a particular gateway.
remote connect device An asynchronous device
that is indirectly connected to a DTC through a
modem and telephone hook-up or through a PAD.
remote node Any network node that is physically
separate from the node you are currently using or
referring to.
retransmission count (N2) The maximum
number of times a frame will be retransmitted
following the expiration of the Retransmission
Timer, T1.
retransmission count (T!) The length of time that
a transmitter will wait for an acknowledgment from
a destination address before attempting to
retransmit a frame. When choosing this value,
factors like the line speed and maximum frame size
should be taken into account.
RFA Remote File Access. A network service that
allows users to access file and devices on remote
nodes.
routing The path that packets or fragments of a
message take through a network to reach a
destination node.
RMP Remote Maintenance Protocol. HP proprietary
protocol used in DTC management.
RPM Remote Process Management. A network
service that allows a process to programmatically
initiate and terminate other processes throughout a
network from any node on the network.
RS-232-C The Electronic Industries Association
(EIA) Level 1 protocol specification that defines
electrical circuit functions for 25 connector pins. HP
provides two implementations of this standard: a
3-pin version for direct connections up to a distance
of 15 meters (50 feet), and a version which makes
use of additional circuits and can be used for either
modem or direct connections.
RS-422 The Electronic Industries Association (EIA)
Level 1 protocol specification implemented by HP in
a 5-pin version which can be used for direct device
connection up to a distance of 1500 meters
(4000 feet).
S
security string An alphanumeric character string
that functions as a password for dial links. The
security string is used by the Dial IP protocol.
serial device Any device that is attached to and
communicates with a computer by means of a serial
transmission interface. Terminals, printers, and
plotters are among the devices that communicate
serially with MPE/iX computers.
serial transmission A method of transferring data
in which characters are transmitted one bit at a time
and received one bit at a time in the order of
transmission. This transmission scheme is employed
by devices connected to the MPE/iX systems via the
DTC.
session-accepting device A terminal or personal
computer running in terminal-emulation mode that
is able to establish an interactive (conversational)
session with an HP 3000 computer. Also referred to
as a logon device.
shared dial A dial link that provides connection to
more than one remote system, although to only one
at a time.
shared-line access The feature that allows two or
more HP 3000 Series 900 hosts to use the same
DTC/X.25 Network Access card on a DTC to access
an X.25 network.