Configuring Systems for Terminals, Printers, and Other Serial Devices (32022-90057)

Glossary
synchronous
Glossary
261
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 e3000 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.
SIC Serial Interface Card. A card installed in the
front of the DTC that acts as an interface between a
corresponding Connector Card (CC) and the DTC’s
processor.
slaved device A device that shares the same DTC
port as another device and is connected, to the other
device, referred to as its master, by a cable. The
actions of the slaved device are controlled by the
master device.
SNMP Simple Network Management Protocol. An
industry standard for managing networked
computers in a multi-vendor environment.
SNMP agent A network node, such as a DTC, that
is able to respond to SNMP requests.
SNMP manager A network management platform
that is running software which allows it to manage
SNMP nodes.
SNP Synchronous Network Processor card; an
alternative name for an X.25 board.
spooled device A printer that is accessed through
the MPE/iX spooling facility. The spooling facility
allows a nonsharable device to be shared among
several users by temporarily storing output data on
disk and managing the selection of output spool files
destined for the spooled device.
start bit A data bit used to signal the start of a
character being transmitted in an asynchronous
communication mode.
station address A link-level address used by the
IEEE 802.3 protocol that is assigned to every node
on an IEEE 802.3 network.
stop bit A data bit used to signal the end of a
character being transmitted in an asynchronous
communication mode.
store-and-forward A technique in which messages
are passed from one node to another in a network to
reach their destination. Point-to-point networks use
the store-and-forward technique to transmit
messages.
subnet Another name for a network, especially if
the network is part of an internetwork. The word
subnet is also a synonym for intranet.
SVC Switched Virtual Circuit. The path through an
X.25 network that is established at call set-up time.
switching See DTC switching.
Switching User Interface The user interface
available when DTC switching is enabled that
allows terminal users to choose the MPE/iX
computer with which they want to establish a
communication link.
synchronous A mode of operation or transmission
in which a continuous data stream is generated
without intervals between characters. The data
stream is synchronized by clock signals at the
receiver and transmitter. As a result, fast
transmission speeds (above 9600 bps) are attainable.