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

Glossary
IEEE 802.3
Glossary
225
full gateway A full gateway is a node that belongs
to more than one network and has one IP address for
each network. It uses store and forward to transfer
packets between each network that it belongs to.
gateway A node that connects two dissimilar
network architectures. A gateway can be either a
single node (full gateway) or two gateway halves.
gateway half A node that works in conjunction
with another node on another network to form an
internetwork. The only protocol used by gateway
halves is the NS Point-to-Point 3000/iX Link. See
also full gateway.
gateway-half link A link between the two nodes of
a gateway-half pair. Each of the two nodes of a
gateway-half pair has a configured link (hardware
interface card) that is used for the gateway half
network interface. The NS Point-to-Point 3000/iX
Link is the only link that can be used as a
gateway-half link.
gateway-half pair A set of two nodes that are
joined by a gateway-half link. Each node in the pair
must have a gateway-half network interface
configured, using the link.
guided configuration A method of configuring a
node in which a subset of the complete NMMGR
interface is presented and defaults of configurable
values are used automatically.
handshaking A communications protocol between
devices or between a device and the CPU. Provides a
method of determining that each end of a
communications link is ready to transmit or receive
data and that transmission has occurred without
error.
hardware handshake Uses modem signals CTS
and RTS to pace the data transfer from the DTC to
the attached device. (For DTC 16iX/MX/RX and
DTC 72MX only.)
hop count See internet hop count and intranet
hop count
host-based network management Method of
managing asynchronous communications for HP
3000 Series 900 computers. All of the control
software is configured on a single host and is
downloaded to the DTCs that are managed by that
host. With host-based management, there is a
permanent relationship between each DTC and the
host, and terminal users can access only the single
system that owns the DTC their terminal is
connected to.
host-based X.25 The management of X.25 network
connections from a host computer. Host-based X.25
network connections are made through a DTC
Network Access card installed in a DTC managed by
the host. All configuration is accomplished using the
NMMGR utility. It is not necessary for a PC to be
part of the LAN when you are using host-based X.25.
host computer The primary or controlling
computer on a network. The computer on which the
network control software resides. For HP purposes,
it may also be used to distinguish the HP 3000
Series 900 system (host) from the DTC.
HP ARPA Telnet Express A DTC dedicated to
providing protocol conversion between Telnet on
TCP/IP and AFCP to allow incoming calls from the
ARPA environment to HP 3000 systems.
HP block mode Block mode transmission method
employed by HP computers where the system
controls the block mode handshake. When HP block
mode is used, the user program need not concern
itself with data transfer protocol.
HP PPN Hewlett-Packard Private Packet Network.
Hewlett-Packard’s own packet-switching X.25
network, which gives users full control over the
administration and security of their data
communications.
HP TS8 A terminal server that can support up to
eight asynchronous serial connections. When used in
back-to-back configuration, users can access HP
3000 MPE/V systems on it via a DTC.
idle device timeout Timeout defined by the
Configure: CPU command. When the timer lapses, a
device connected to the DTC user interface that is
still inactive will be disconnected.
IEEE 802.3 A standard for a broadcast local area
network published by the Institute for Electrical and
Electronics Engineers (IEEE). This standard is used
for both the ThinLAN and ThickLAN
implementations of the LAN.