A |
|
access port |
|
A special interface card in the system cabinet through which the
system console is connected. |
|---|
|
address |
|
A numerical identifier defined and used by a particular protocol and
associated software to distinguish one node from another.
|
|---|
|
address key |
|
See X.25 address key.
|
|---|
|
address resolution |
|
In NS networks, the mapping of node names to IP addresses and the
mapping of IP addresses to subnet addresses. |
|---|
|
address resolution protocol |
|
ARP. A protocol used by LAN links with Ethernet enabled that provides
a means of exchanging addressing information between Ethernet nodes.
|
|---|
|
adjacent |
|
A node on a point-to-point network that is connected to another node
by a single link with no intervening nodes. |
|---|
|
APRA Telnet Express |
|
An HP product which is a standalone hardware platform dedicated to
performing protocol translation. Calls to the IP address of an MPE/iX
system are detected by the Telnet Express and are retransmitted on the LAN
using AFCP, allowing connections from terminals on ARPA systems to HP
3000s. |
|---|
|
ARPA |
|
Advanced Research Projects Agency. It is the former name of the
Defense Advanced Research Project Agency (DARPA). The Internet suite of
protocols was developed under ARPA guidance. |
|---|
|
ARPA Telnet Access |
|
An HP product which is a board that can be installed in a DTC 48 and
DTC 72MX. The Telnet Access board performs protocol translation. Calls to
the IP address of an MPE/iX system are detected by the Telnet Access board
and are retransmitted on the LAN using AFCP, allowing connections from
terminals on ARPA systems to HP 3000s. |
|---|
|
ARPANET |
|
The (Advanced Research Projects Agency) computer network.
|
|---|
|
ASCII |
|
American National Standard Code for Information Interchange. A
character set using 7-bit code used for information interchange among data
processing and data communications systems. The American implementation of
International Alphabet No. 5. |
|---|
|
asynchronous |
|
Term used to describe a device's mode of operation whereby a sequence
of operations are executed irrespective of time coincidence with any event.
Devices that are directly accessible by people (for example, terminal
keyboards) operate in this manner. |
|---|
|
asynchronous processor board |
|
The new 24-port mux board for the DTC 72MX. Allows up to 24 direct
and modem connections per board. A DTC 72MX can have up to 3 asynchronous
processor boards (for a total of 72 connections). |
|---|
|
attachment unit interface |
|
The cable that runs between each node (host, DTC, or other device)
and the Medium Attachment Unit (MAU) that connects it to the LAN in a
ThickLAN configuration. |
|---|
|
AUI |
|
See attachment unit
interface. |
|---|
|
autodial |
|
A dial link in which the remote node's telephone number is
automatically dialed by a modem or other device with this capability.
|
|---|
|
automatic configuration |
|
The addition and configuration of a host-based managed DTC to the HP
3000 system without needing to specify detailed configuration information
such as DTC cards/boards and ldevs. |
|---|
B |
|
back-to-back configuration |
|
A DTC configuration whereby MPE users connected to one DTC can
communicate with a non-MPE/iX system connected to another DTC via the LAN.
(See also Local Switching)
|
|---|
|
backbone LAN |
|
A thick LAN cable conforming to the IEEE 802.3 Type 10 BASE 5
standard. |
|---|
|
backup configuration file |
|
A file that contains a copy of the information contained in the
configuration file. The backup file, called
NMCBACK.group.account by default, is updated each time
the configuration file is successfully validated. |
|---|
|
banner |
|
A welcome message displayed on your screen. On the local OpenView
workstation a banner appears when a remote connection is established with
the OpenView DTC Manager. A banner also can appear when you log on to MPE.
|
|---|
|
baud |
|
Measure of the speed at which information travels between devices,
most commonly used in reference to terminal speed settings. Baud
represents signal events per second. When one bit represents each signal
change, baud is the same as "bits per second". |
|---|
|
binary mode |
|
Data transfer scheme in which no special character processing is
performed. All characters are considered to be data and are passed through
with no control actions being taken. |
|---|
|
bit |
|
Binary digit. A unit of information that designates one of two
possible states, which are represented by either 1 or 0.
|
|---|
|
block mode |
|
Terminal processing mode in which groups, or "blocks," of data are
transmitted all at once. |
|---|
|
BNC T-Connector |
|
Connector used to connect a computer or a component such as a DTC to
the LAN in a ThinLAN configuration. |
|---|
|
boundary |
|
See network boundary.
|
|---|
|
bps |
|
Bits per second. The number of bits passing a point per second.
|
|---|
|
broadcast |
|
Communication method of sending a message to all devices on a link
simultaneously. |
|---|
|
byte |
|
A sequence of eight consecutive bits operated on as a unit.
|
|---|
C |
|
call |
|
In X.25, a call is an attempt to set up communication between two
DTEs using a virtual circuit. Also known as a virtual call.
|
|---|
|
call collision |
|
A conflict that occurs at a DTE/DCE interface when there is a
simultaneous attempt by the DTE and DCE to set up a call using the same
logical channel identifier. |
|---|
|
called address |
|
When a node sends out a call request packet, the packet contains the
address of the destination node. The address of the destination node is
the called address. |
|---|
|
calling address |
|
When a node receives an incoming call packet, the packet contains the
address of the sending node. The address of the sending node is the
calling address. |
|---|
|
carrier |
|
A continuous wave that is modulated by an information bearing signal.
|
|---|
|
catenet |
|
See internetwork.
|
|---|
|
CCITT |
|
Consultative Committee for International Telephony and Telegraphy. An
international organization of communication carriers, especially
government telephone monopolies, responsible for developing
telecommunication standards by making recommendations. No carrier is
required to adhere to a CCITT recommendation, although most do so
in their own interest. |
|---|
|
CIB |
|
The channel input/output bus in the backplane of an HP 3000.
|
|---|
|
circuit-switching network |
|
A type of data communications network wherein a physical and
exclusive link is maintained between two communicating devices for the
call duration. An all-digital, circuit-switching network is often referred
to as an X.21 network. |
|---|
|
closed user group |
|
An X.25 user facility that allows communication to and from a
pre-specified group of users and no one else. |
|---|
|
compatibility mode |
|
Processing mode on HP 3000 Series 900 computers that allows
applications written for MPE V/E-based systems to be ported and run
without changes or recompilation. |
|---|
|
computer network |
|
A group of computer systems connected in such a way that they can
exchange information and share resources. |
|---|
|
configuration |
|
1) The way in which computer equipment is physically interconnected
and set up to operate as a system.
2) The layout of the computer system, including the MPE table, memory, and
buffer sizes, that tells which peripheral devices are (or can be)
connected to the computer and how they can be accessed.
3) The process of defining the characteristics of a network in software.
For MPE/iX-based computers, the operating systems are configured through
use of the SYSGEN utility. Next, the datacommunications and terminal
subsystem (DTS) link is configured by using NMMGR (running on the host)
and may, in addition, be configured using the OpenView DTC Manager
software (running on the OpenView Windows Workstation) depending on the
type of network management you use. If any of the NS link products are
installed on the system, network configuration is accomplished through use
of NMMGR and, if PC-based X.25 connections are required, through the
OpenView DTC Manager. |
|---|
|
configuration file |
|
he configuration file, which you create and update using the NMMGR
utility, contains:
1) the information that the network needs in order to operate.
2) Information necessary for link-level and NetIPC logging.
3) Information required to connect terminals and printers to the system
through one or more DTC.
The only file name that the system recognizes as the configuration file is
NMCONFIG.PUB.SYS. |
|---|
|
control-X echo |
|
Three exclamation marks (!!!) output to the terminal screen when the
cancel character (normally [CTRL]-X) is entered.
|
|---|
|
control-Y trap |
|
User-written procedure to which control is passed when the subsystem
break character (normally [CTRL]-Y) is entered during execution of
a program with subsystem break enabled. |
|---|
|
cross-validate |
|
The process of assuring that information contained in two locations
is consistent where it is imperative that it be consistent. For example,
an automatic cross-validation occurs when you enter SYSGEN to assure that
information contained in NMCONFIG.PUB.SYS agrees with system
configuration data. |
|---|
|
CSMA/CD |
|
Carrier Sense Multiple Access with Collision Detect, transmission
access method used by the IEEE 802.3 LAN standard. |
|---|
|
CSN |
|
See circuit-switching network.
|
|---|
ÿ r>?ch>
CTB
|
The cache transfer bus in the backplane of an HP 3000.
|
|
CUG |
|
See closed user group.
|
|---|
D |
|
D bit |
|
Delivery confirmation bit. Used in the X.25 protocol, the setting of
the D bit in DATA packets indicates whether delivery acknowledgment of the
packet is required from the local DCE or from the remote DTE. It therefore
allows the choice between local and end-to-end acknowledgment.
|
|---|
|
data |
|
Basic elements of information that can be processed or produced by a
computer. |
|---|
|
data overrun |
|
Transmitted data that is sent faster than the equipment on the
receiving end is capable of receiving it. The resulting overflow data is
lost. See also flow control.
|
|---|
|
Datacommunications and Terminal Controller |
|
See DTC.
|
|---|
|
Datapac |
|
The national public PSN of Canada. |
|---|
|
Datex-P |
|
The national public PSN of West Germany. |
|---|
|
DCE |
|
Data circuit-terminating equipment. The interfacing equipment
required in order to interface to data terminal equipment (DTE) and its
transmission circuit. Synonyms: data communications equipment, dataset.
|
|---|
|
DDX |
|
The national public PSN of Japan. |
|---|
|
dedicated printer |
|
A printer that can be used by only one host on the LAN; the one
specified in the Destination Node Name in that printer's configuration
screen. |
|---|
|
default gateway |
|
One (and only one) gateway accessible by a system may be designated
as a default gateway. The network will then send any transmitted messages
for which it is unable to locate a destination through normal means to the
default gateway in a final effort to determine a transmission route.
|
|---|
|
demodulation |
|
The process by which the information-bearing signal is retrieved from
a modulated carrier wave. The inverse of modulation. |
|---|
|
destination node name |
|
In DTS 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 class |
|
A collection of devices that have some user-defined relation. Device
classes are assigned through use of the NMMGR configuration utility.
|
|---|
|
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.
|
|---|
|
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.
|
|---|
|
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 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-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-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). |
|---|
|
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. |
|---|
|
DTC 16RX |
|
HP J2064A product. A routable communications server that enables up
to 16 asynchronous connections for the HP 3000 environment and computer
systems running ARPA, such as HP 9000s and third party systems.
|
|---|
|
DTC 16RX Manager |
|
An application program that resides on the HP 9000 host system and
enables you to configure and diagnose the HP DTC 16RX Routable
Communications Server. |
|---|
|
DTC 16TN |
|
HP J2060A product. A DTC terminal server for Telnet systems. It
allows up to 16 asynchronous connections to computer systems running ARPA,
such as HP 9000s and third party systems. |
|---|
|
DTC 48 |
|
HP 2345B product. A DTC that provides 6 slots for asynchronous
connections, X.25 links, or Telnet Access. Each slot allows up to 8 direct
connections or 6 modem connections. A DTC 48 may have up to 3 slots used
for X.25 links, each supporting up to 256 virtual circuits at speeds of up
to 64 Kbps or one Telnet Access card with 40 Telnet connections to HP 3000
Series 900 connections. |
|---|
|
DTC 72MX |
|
HP J2070A product. A DTC that provides 3 slots allowing up to 72
asynchronous connections. Each slot accommodates up to 24 direct or modem
connections. A DTC 72MX may have up to 3 slots used for X.25 links, each
supporting up to 256 virtual circuits at speeds of up to 64 Kbps. It may
also use one slot for Telnet Access card with 40 Telnet connections to HP
3000 Series 900 computers. |
|---|
|
DTC identifier |
|
An identifier used only within NMMGR to define the branch of the
configuration file containing information about a particular DTC. The
identifier must begin with a letter and can be up to eight characters long.
|
|---|
|
DTC Manager |
|
See OpenView DTC Manager.
|
|---|
|
DTC node name |
|
Unique name used to identify a DTC on the LAN. Node name format is
nodename.domain.organization, with each of the three
parts having up to 16 characters and beginning with either a letter or a
digit. |
|---|
|
DTC station address (802.3 address) |
|
12-digit hexadecimal number used to identify the DTC as a node
belonging to the network configuration. Also called the LAN address.
|
|---|
|
DTC switching |
|
A facility enabling terminal users to select any host system that
they want to connect to. DTC switching is available only when the OpenView
DTC Manager is used for network management. |
|---|
|
DTC/X.25 iX Network Link |
|
Software and hardware that provides access to private and public X.25
networks. The X.25 iX System Access software resides on an HP 3000 host
and is configured through use of NMMGR. |
|---|
|
DTC/X.25 Network Access |
|
The X.25 software that resides on the Datacommunications and Terminal
Controller (DTC). To configure access to an X.25 network, you must
configure two software components: the X.25 iX System Access (residing on
the HP 3000 host), and the DTC/X.25 Network Access. DTC/X.25 Network
Access is configured through use of the OpenView DTC Manager software for
systems using PC-based network management or through NMMGR for systems
using host-based network management. |
|---|
|
DTC/X.25 Network Access card |
|
This is the hardware card and channel adapter that provides X.25
Network Access. It resides in the Datacommunications and Terminal
Controller (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. |
|---|
|
DTE |
|
Data Terminal Equipment. Equipment that converts user information
into data-transmission signals or reconverts received data signals into
user information. Data terminal equipment operates in conjunction with
data circuit-terminating equipment. |
|---|
|
DTS |
|
Datacommunications and Terminal Subsystem. This consists of all the
Datacommunications and Terminal Controllers (DTCs) on a LAN, their LANIC
cards (attached to the host), the LAN cable, and the host and DTC software
that controls all related DTS hardware. |
|---|
|
DTS restart |
|
The startup of the DTS subsystem, including the release of all
TIO-related resources, using the DTCCNTRL command file.
|
|---|
|
DTS shutdown |
|
The shutdown of the DTS subsystem, including the release of all
TIO-related resources, using the DTCCNTRL command file.
|
|---|
|
duplex |
|
Transmission method that allows two-way communication. If both ends
of the transmission link can transmit simultaneously, it is called full
duplex. If only one end can transmit at a time, it is half-duplex
transmission. |
|---|
|
dynamic configuration |
|
The ability to make DTS configuration changes using NMMGR without
rebooting the HP 3000 system. |
|---|
E |
|
entry priority |
|
The ranking that identifies the most desirable route used to reach a
given remote node from a given local node in a point-to-point network.
|
|---|
|
environment |
|
A session that is established on a remote node. |
|---|
|
escape from data transfer character |
|
A character that allows a user who is connected to a host system
through the DTC to break that connection and return to the DTC switching
user interface. The default is [CTRL]-K. This character is used
only on networks managed by the OpenView Windows Workstation.
|
|---|
|
escape sequence |
|
A sequence of characters beginning with the escape character and
followed by one or more other characters, used to convey control
directives to printers, plotters, or terminals. |
|---|
|
Ethernet |
|
A Local Area Network system that uses baseband transmission at 10
Mbps over coaxial cable. Ethernet is a trademark of Xerox Corporation.
|
|---|
|
event log |
|
One of three circular files stored on the OpenView workstation
containing lists of all significant events reported by the DTCs for which
it is the owner; that is, whose operating software/configuration it has
downloaded. |
|---|
|
extended packet sequence numbering |
|
One of the optional network subscribed facilities that provides
packet sequence numbering using modulo 128. If not subscribed, modulo 8 is
used. |
|---|
F |
|
facility |
|
An optional service offered by a packet switching network's
administration and requested by the user either at the time of
subscription for network access or at the time a call is made. Also known
as user facility. |
|---|
|
facility set |
|
A facility set defines the various X.25 connection parameters and
X.25 facilities that can be negotiated for each virtual circuit on a
per-call basis. |
|---|
|
fast select |
|
An optional packet-switching network facility by which user data may
be transmitted as part of the control packets that establish and clear a
virtual connection. |
|---|
|
FCS |
|
Frame Check Sequence. A sequence of bits generated by X.25 at level 2
that forms part of the frame and guarantees the integrity of its frame's
content. The FCS is also used by the IEEE 802.3 protocol to check the
validity of frames. |
|---|
|
file equation |
|
Assignment statement used to associate a file with a specific device
or type of device during execution of a program. |
|---|
|
file number |
|
Unique number associated with a file when the file is opened. The
file number is returned in the FOPEN or HPFOPEN call used to open the file.
It can be used to access that file until the file is closed.
|
|---|
|
file specification |
|
The name and location of a file. The full specification for a file
includes the file name, group, and account. |
|---|
|
file system |
|
The part of the operating system that handles access to input/output
devices (including those connected through the DTC), data blocking,
buffering, data transfers, and deblocking. |
|---|
|
flow control |
|
A means of regulating the rate at which data transfer takes place
between devices to protect against data overruns. |
|---|
|
flow control negotiation |
|
One of the network subscribed facilities, selected at subscription
time. This facility allows the flow control parameter to be negotiated at
call set-up time, as opposed to having a predefined value.
|
|---|
|
formal file designator |
|
Name that can be used programmatically or in a file equation to refer
to a file. |
|---|
|
FOS |
|
Fundamental Operating System. The programs, utilities, and subsystems
supplied on the master installation tape that form the basic core of the
operating system. |
|---|
|
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. |
|---|
G |
|
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. |
|---|
H |
|
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 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.
|
|---|
|
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. |
|---|
|
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. |
|---|
I |
|
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.
|
|---|
|
IEEE 802.3 multicast address |
|
A hexadecimal number that identifies a set of nodes. This address is
used for multicast delivery. |
|---|
|
IEEE 802.3 nodal address |
|
A unique hexadecimal number that identifies a node on an IEEE 802.3
LAN. |
|---|
|
IEEE 802.5 |
|
A standard for a token ring network published by the Institute for
Electrical and Electronics Engineers (IEEE). This standard is used for the
Token Ring 3000/iX Network Link. |
|---|
|
initialization string |
|
A sequence of control characters used to initialize a terminal,
printer, or plotter when a connection is established from a host on the
network. |
|---|
|
interactive communications |
|
Processing that allows users to enter commands and data at the
terminal and receive an immediate response. |
|---|
|
internet communication |
|
Communication that occurs between networks. |
|---|
|
internet hop count |
|
The number of full gateways plus the number of gateway-half links
that a packet must pass through in moving from source node to destination.
|
|---|
|
Internet Protocol |
|
A protocol used to provide routing between different local networks
in an internetwork, as well as among nodes in the same local network. The
Internet Protocol corresponds to layer 3, the network layer, of the OSI
model. See also IP address.
|
|---|
|
internet routing |
|
Internet routing involves all the processes required to route a
packet from a node on one network to a destination node on another network.
|
|---|
|
internetwork |
|
Two or more networks joined by gateways, bridges, or routers.
|
|---|
|
intranet communication |
|
Communication that occurs between nodes in a single network.
|
|---|
|
intranet hop count |
|
The number of intermediate nodes that lie between a source and
destination node on the same point-to-point network. |
|---|
|
intranet routing |
|
Intranet routing involves all the processes required to route a
packet from one node in a network to another node in the same network.
|
|---|
|
intrinsic |
|
System routine accessible by user programs which provides an
interface to operating system resources and functions. Intrinsics perform
common tasks such as file access and device control. |
|---|
|
IP |
|
See Internet Protocol.
|
|---|
|
IP address |
|
Internet Protocol address. An address used by the Internet Protocol
to perform internet routing. A complete IP address comprises a network
portion and a node portion. The network portion of the IP address
identifies a network, and the node portion identifies a node within the
network. |
|---|
|
IP subnet mask |
|
See subnet mask.
|
|---|
|
ISO |
|
International Standards Organization. An international federation of
national standards organizations involved in developing international
standards, including communication standards. |
|---|
L |
|
LAN |
|
Local Area Network. A collection of data communication systems
sharing a common cable whereby each system can communicate directly with
another. |
|---|
|
LAN address |
|
See station address.
|
|---|
|
LANIC |
|
See Local Area Network Interface Controller.
|
|---|
|
LANIC physical path |
|
The physical location (slot number) of the LANIC within the SPU.
|
|---|
|
LANIC self-test |
|
A ROM-based program on a LANIC card that tests and reports the status
of the LANIC hardware. |
|---|
|
LAP |
|
Link Access Protocol. The data link protocol specified by older
versions (prior to 1980) of X.25 at level 2 but still permitted and
therefore usable. All new implementations of X.25 must use LAP-B, and all
old implementations must migrate to LAP-B at a future date.
|
|---|
|
LAP-B |
|
Link Access Protocol - Balanced. The data link protocol specified by
the 1980 version of X.25 at level 2 that determines the frame exchange
procedures. LAP-B must also be used over direct-connect NS Point-to-Point
3000/iX Links. |
|---|
|
LCI |
|
Logical Channel Identifier. Local value on a network node which
identifies the channel used to establish a virtual circuit (SVC or PVC)
through an X.25 network. |
|---|
|
ldev |
|
See logical device number. |
|---|
|
leased line |
|
Data-grade telephone line leased directly to a subscriber and
allocated specifically for the subscriber's needs. |
|---|
|
line speed |
|
Speed at which data is transferred over a specific physical link
(usually measured in bits or kilobits per second). |
|---|
|
link name |
|
The name that represents a hardware interface card. The link name can
contain as many as eight characters. All characters except the first can
be alphanumeric; the first character must be alphabetic.
|
|---|
|
Local Area Network Interface Controller (LANIC) |
|
A hardware card that fits into the backplane of the HP 3000 Series
900 computer and provides a physical layer interface for local area
networks. |
|---|
|
local connection |
|
See direct connection.
|
|---|
|
local node |
|
The computer that you are configuring or that you are logged on to.
|
|---|
|
local switching |
|
Feature of the DTC which permits back-to-back configuration (for
connections to an HP 3000 MPE/V host), using two ports of the same DTC.
|
|---|
|
local user group |
|
A list defined for a particular DTC and card that specifies which
remote nodes this DTC can send data to and also which remote
nodes this DTC can receive data from. (See also
Closed User Group).
|
|---|
|
log off |
|
The termination of a job or session. |
|---|
|
log on |
|
The process of initiating a job or session. |
|---|
|
logging |
|
The process of recording the usage of network resources. Events can
be logged to both the OpenView workstation and to the MPE host.
|
|---|
|
logging class |
|
A number defining the severity of any given event logged. An operator
uses the logging classes to specify which events are to be logged. Class 1
(catastrophic event) is always logged. |
|---|
|
logical device number (ldev) |
|
A value by which the operating system recognizes a specific device.
All DTC devices that are configured as nailed devices through the NMMGR
configuration have ldev numbers permanently assigned. The DTC devices can
then be accessed programmatically through use of their ldev number.
Non-nailed devices have ldev numbers that are assigned from a pool of
available ldev numbers for the life of their connection to a system. You
cannot access non-nailed devices programmatically. |
|---|
|
logon device |
|
See session-accepting device.
|
|---|
|
loopback |
|
The routing of messages from a node back to itself.
|
|---|
|
LUG |
|
See local user group.
|
|---|
M |
|
M bit |
|
More data bit. Setting this bit in a DATA packet indicates that at
least one more DATA packet is required to complete a message of contiguous
data. |
|---|
|
maintenance mode |
|
An NMMGR character mode interface used to manage both network
directory and configuration files. It can be used interactively, from
within the screen mode interface, or as a set of commands entered via a
batch job. |
|---|
|
map, network |
|
A drawing that shows the topology of the network. For networks
managed by the OpenView DTC Manager, a network map must be created through
use of the OVDraw capability provided with the management software. A
network map is also a hardcopy drawing used when planning a network. It
shows network topology, node and network names, addresses, network
boundaries (for an internetwork map), and link types.
|
|---|
|
mapping |
|
A set of characteristics that describe a route taken by messages to
reach a destination node. This set of characteristics is configured with
NMMGR at every node on a point-to-point network. One mapping is configured
at each node for every other node on the network to which messages will be
sent. |
|---|
|
MAU |
|
See medium attachment unit.
|
|---|
|
medium attachment unit |
|
A device attached to a ThickLAN coaxial cable that provides the
physical and electrical connection from the AUI cable to the coaxial cable.
|
|---|
|
MIB |
|
Management Information Base. A database of information about a
network node used by SNMP. |
|---|
|
MIT |
|
Master Installation Tape. Magnetic tape containing the fundamental
operating system for a HP 3000 Series 900 computer. |
|---|
|
modem |
|
Modulator/demodulator. A device that modulates and demodulates
signals. Primarily used for modulating digital signals onto carriers for
transmission and for performing the inverse function at the receiving end.
Modems are essential for transmitting and receiving digital signals over
telephone lines. |
|---|
|
modulation |
|
Process in which certain characteristics of a carrier signal are
altered in accordance with the changes of an information-bearing signal.
|
|---|
|
modulo |
|
Value used as the counting cycle for determining the send sequence
number (N(S)) of frames sent across an X.25 network. |
|---|
|
MPE/iX |
|
MultiProgramming Executive / integrated POSIX. The operating system
of HP 3000 Series 900 computers. The NS 3000/iX network services operate
in conjunction with the MPE/iX operating system. |
|---|
|
multiplexer |
|
A device that allows multiple communication links to use a single
channel. |
|---|
N |
|
nailed device |
|
A device with a permanently associated ldev that was assigned through
the NMMGR configuration of the host system on which the association is
established. Nailed devices can be accessed programmatically through their
ldev number. In contrast, non-nailed devices have ldev numbers that are
assigned from a pool of available ldev numbers for the life of their
connection to a system. |
|---|
|
native mode |
|
The run-time environment of MPE/iX. In Native Mode, source code has
been compiled into the native instruction set of the HP 3000 Series 900
computer. |
|---|
|
neighbor gateway |
|
A gateway that is in the same network as a given node.
|
|---|
|
NetIPC |
|
Network Interprocess Communication. Software that enables programs to
access network transport protocols |
|---|
|
network |
|
A group of computers connected so that they can exchange information
and share resources. |
|---|
|
network address |
|
This can be either 1) the network portion of an IP address as opposed
to the node portion, or 2) when referring to X.25 networks, it is a node's
X.25 address. |
|---|
|
network boundary |
|
The logical division between networks in an internetwork.
|
|---|
|
network directory |
|
A file containing information required for one node to communicate
with other nodes in 1) an internetwork, 2) an X.25 network, or 3) a
network that contains non-HP nodes. The active network directory on a node
must be named NSDIR.NET.SYS. |
|---|
|
network interface |
|
NI. The collective software that enables data communication between a
system and a network. A node possesses one or more network interfaces for
each of the networks to which it belongs. Network interface types are LAN,
point-to-point (router), X.25, token ring, SNA, loopback, and gateway half.
The maximum number of supported NIs is 12, one of which is reserved for
loopback. |
|---|
|
network management |
|
The collective tasks required to design, install, configure, maintain,
and if necessary, change a network. |
|---|
|
network map |
|
A drawing that shows the topology of the network. For networks
managed by the OpenView DTC Manager, a network map must be created using
the OVDraw capability provided with the management software. A network map
is also a hardcopy drawing used when planning a network. It shows network
topology, node and network names, addresses, network boundaries (for an
internetwork map), and link types. |
|---|
|
Network Services |
|
NS. Software application products that can be used to access data,
initiate processes, and exchange information among nodes in the network.
The NS 3000/iX Network Services include RPM, VT, RFA, RDBA, and NFT.
|
|---|
|
network subscribed facilities |
|
A set of parameters that the user chooses when he subscribes to the
X.25 network; they include flow control negotiation, use of D-bit,
throughput class negotiation and extended packet sequence numbering.
|
|---|
|
network transport |
|
Software that corresponds to layers 4 and 3 of the OSI network
architecture model. The function of this software is to send data out over
the appropriate communications link, to receive incoming data, and to
route incoming or outgoing data to the appropriate destination node.
|
|---|
|
NFT |
|
Network File Transfer. The network service that transfers disk files
between nodes on a network. |
|---|
|
NI |
|
See network interface.
|
|---|
|
NMCBACK.PUB.SYS |
|
The default file name for the file that contains a copy of the
information contained in the configuration file
(NMCONFIG.PUB.SYS). The backup file is updated each time the
configuration file is successfully validated. |
|---|
|
NMCONFIG.PUB.SYS |
|
A file that contains all the network configuration data for the HP
3000 Series 900 computer on which it resides. It includes information
about the DTCs that can access the system as well as information about any
Network Services (NS) products running on the system. This is the only
file name allowed. |
|---|
|
NMDUMP |
|
Node management services trace/log file analyzer. A utility used to
format log and trace files. |
|---|
|
NMMAINT |
|
Node management services maintenance utility. A utility that lists
the software module version numbers for all HP AdvanceNet products,
including NS 3000/iX. It detects missing or invalid software modules.
|
|---|
|
NMMGR |
|
Node management services configuration manager. A software subsystem
that enables you to configure DTC connectivity and network access
parameters for a HP 3000 Series 900 computer. |
|---|
|
NMMGRVER |
|
Node management services conversion utility. A conversion program
that converts configuration files created with NMMGR from an earlier
version to the latest format. |
|---|
|
NMSAMP1.PUB.SYS |
|
Sample configuration file supplied with FOS that can be used as a
template for DTS configuration. |
|---|
|
node |
|
A computer that is part of a network. The DTC is also considered to
be a node and has its own address. |
|---|
|
node address |
|
The node portion of an IP address, which consists of a node portion
and a network portion. |
|---|
|
Node
Management Services Configuration Manager |
|
See NMMGR.
|
|---|
|
node name |
|
A character string that uniquely identifies each system in a network
or internetwork. Each node name in a network or internetwork must be
unique; however, a single node can be identified by more than one node
name. |
|---|
|
node names list |
|
List defined on the OpenView workstation and subsequently downloaded
to all DTCs for which it is the "owner." The list specifies all the HP
3000 Series 900 hosts on the LAN that are accessible from the DTCs.
|
|---|
|
non-adjacent |
|
Describes a node on an NS Point-to-Point 3000/iX network that is
separated from a given node by intervening or intermediate node.
|
|---|
|
non-nailed device |
|
A session accepting device that is not permanently associated with an
ldev number at configuration time. When the user at such a device logs on
to a HP 3000 Series 900, an ldev is assigned from a pool of ldevs set
aside for this purpose at configuration time. The association between a
non-nailed device and this temporarily assigned ldev exists only for the
duration of the session. One advantage of the use of non-nailed device
connections is that configuration is simplified, since it is not required
that each non-nailed device be individually configured.
|
|---|
|
NS 3000/iX |
|
A Hewlett-Packard data communication product that provides
minicomputers. NS 3000/iX consists of one or more links and network
services. |
|---|
|
NS 3000/iX Link |
|
Software and hardware that provides the connection between nodes on a
network. Some of the NS 3000/iX links available are the ThinLAN 3000/iX
Link and its ThickLAN option, the DTC/X.25 iX Network Link, the NS
Point-to-Point 3000/iX Link, and the Token Ring 3000/iX Network Link.
|
|---|
|
NS 3000/iX Network Services |
|
Software applications that can be used to access data, initiate
processes, and exchange information among nodes in a network. The services
are RPM, VT, RFA, RDBA, and NFT. |
|---|
|
NS Point-to-Point 3000/iX Link |
|
Hardware and software necessary to create networks in which data is
transmitted from node to node over a defined route until it reaches its
destination. This technique is referred to as store and forward. Systems
in a point-to-point network are connected by means of leased or dial-up
telephone lines. HP 3000 systems attach to the point-to-point network via
HP 3000 Programmable Serial Interface (PSI) cards that fit into the back
of each system's SPU. |
|---|
|
NSDIR.NET.SYS |
|
Name of the active network directory file. See also
network directory.
|
|---|
O |
|
octet |
|
An eight-bit byte operated upon as an entity. |
|---|
|
OpenView Admin |
|
An OpenView Windows program that enables you to configure how your
OpenView Windows applications will function. For example, it enables you
to set a default map for the OpenView DTC Manager. |
|---|
|
OpenView Draw |
|
An OpenView Windows program that enables you to draw the network map,
and to label the components on it. |
|---|
|
OpenView DTC Manager |
|
OpenView Windows application that enables you to configure, control,
monitor, and troubleshoot the operation of the Datacommunications and
Terminal Subsystems on the LAN. |
|---|
|
OpenView Run |
|
An OpenView Windows program that covers most of the control features
used by the DTC Manager, including monitoring and diagnostic functions.
|
|---|
|
OpenView Windows |
|
The set of three programs: OV Admin, OV Draw and OV Run, running on
the OpenView workstation under MS Windows, that acts as the platform for
all OpenView applications, such as DTC Manager. |
|---|
|
OpenView Windows Workstation |
|
The personal computer that provides software downloads to enable
operation of the Datacommunications and Terminal Controller (DTC). The
configuration software that runs on this workstation is called the
OpenView DTC Manager software. |
|---|
|
OSI model |
|
Open Systems Interconnection model. A model of network architecture
devised by the International Standards Organization (ISO). The OSI model
defines seven layers of a network architecture, with each layer performing
specified functions. |
|---|
P |
|
packet |
|
A block of data whose maximum length is fixed. The unit of
information exchanged by X.25 at level 3. There are DATA packets and
various control packets. A packet type is identified by the encoding of
its header. |
|---|
|
Packet Exchange Protocol |
|
PXP. A transport layer protocol used in NS 3000/iX links to initially
establish communication between nodes when NetIPC socket registry is used.
|
|---|
|
packet-switched network name |
|
The name of a data communication network adhering to the CCITT X.25
recommendation. This can be a PDN or a private network, such as the HP PPN.
|
|---|
|
PAD (Packet Assembler/Disassembler) |
|
A device that converts asynchronous character streams into packets
that can be transmitted over a packet switching network (PSN).
|
|---|
|
PAD name |
|
A name of up to eight characters that is associated with a configured
PAD device. The PAD name is known to both the DTC and the host systems
that the device can access. |
|---|
|
PAD profile |
|
Terminal or printer profile that specifies the configuration
characteristics for PAD-connected devices. |
|---|
|
PAD support |
|
A software module which can be downloaded to an X.25 board in a DTC.
The software is used to manage connections with remote PAD devices.
|
|---|
|
partner gateway half |
|
When gateway halves are used, two gateway halves are required in
order to provide communication between two networks. Each is the partner
of the other. |
|---|
|
path name |
|
When configuring with NMMGR, you can type a string in the
COMMAND: field on display screens to branch to another screen. Each
screen has a unique path name that corresponds to its location in the
hierarchy of configuration screens presented by NMMGR.
|
|---|
|
PDN |
|
Public Data Network. A data communication network whose services are
available to any user willing to pay for them. Most PDNs use packet
switching techniques. |
|---|
|
Point-to-Point |
|
A link that connects either two nodes in an NS Point-to-Point 3000/iX
network or two gateway halves. |
|---|
|
port |
|
An outlet through which a device can be connected to a computer,
consisting of a physical connection point and controlling hardware,
controlling software, and configurable port characteristics. Ports can be
thought of as data paths through which a device communicates with the
computer. |
|---|
|
Precision Architecture |
|
The hardware design structure for the HP 3000 Series 900 computer
family. |
|---|
|
printer name |
|
Character string of up to 16 characters specified in the DTC Manager
configuration (for networks using OpenView Network Management) to define a
printer by name. Can be shared by several printers (port pool).
|
|---|
|
printer profile |
|
A set of configuration characteristics that can be associated with
one or more printers through the NMMGR configuration. Printer profile
specifications include the printer type, line speed, device class
assignment, and other values relevant to printers connected through a DTC.
|
|---|
|
printer type |
|
A collection of characteristics that cause a printer connected to a
HP 3000 Series 900 system to act and react in a specified manner. You can
configure a printer to use one of the system-supplied printer types or you
can create custom printer types using workstation configurator.
|
|---|
|
privileged mode |
|
A capability assigned to accounts, groups, or users allowing
unrestricted memory access, access to privileged CPU instructions, and the
ability to call privileged procedures. |
|---|
|
probe protocol |
|
An HP protocol used by NS 3000/iX IEEE 802.3 networks to obtain
information about other nodes on the network. |
|---|
|
probe proxy server |
|
A node on an IEEE 802.3 network that possesses a network directory. A
probe proxy server can provide a node with information about other nodes
on the same or other networks of an internetwork. |
|---|
|
profile |
|
A method of grouping device connection specifications and
characteristics so that the set of characteristics can be easily
associated with groups of like devices. See also
printer profile,
terminal profile.
|
|---|
|
program captive device |
|
See programmatic device.
|
|---|
|
Programmable Serial Interface |
|
PSI. A hardware card that fits into the backplane of the HP 3000
Series 900 computer. It provides a physical layer interface for NS
Point-to-Point 3000/iX Links. |
|---|
|
programmatic device |
|
A device operating under control of a program running on a computer.
Programmatic devices can be used for input, output, or both, depending on
the device and how it is opened by the controlling program.
|
|---|
|
protocol |
|
A set of rules that enables two or more data processing entities to
exchange information. In networks, protocols are the rules and conventions
that govern each layer of network architecture. They define what functions
are to be performed and how messages are to be exchanged.
|
|---|
|
PSN |
|
Packet-Switching Network. Any data communication network using
packet- switching techniques wherein data is disassembled into packets at
a source interface and reassembled into a data stream at a destination
interface. A public PSN offers the service to any paying customer.
|
|---|
|
PSS |
|
Packet-Switching System. The national public PSN of the United
Kingdom. |
|---|
|
PVC |
|
Permanent Virtual Circuit. A permanent logical association between
two physically separate DTEs that does not require call set-up or clearing
procedures. |
|---|
|
PXP |
|
See Packet Exchange Protocol. |
|---|
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 |
|
RDBS |
|
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 |
|
Asynchronous device that is connected to a DTC indirectly, using a
modem and telephone hook-up, or a PAD. |
|---|
|
remote node |
|
A node on an internetwork other than 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 timer (T1) |
|
Length of time the transmitter will wait for an acknowledgment from
the destination address before attempting to retransmit the 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
files and devices on remote nodes. |
|---|
|
router network |
|
See Point-to-Point.
|
|---|
|
routing |
|
The path that packets, or fragments of a message, take through a
network to reach a destination node. |
|---|
|
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 |
|
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 |
|
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 HP 3000
Series 900 computers. |
|---|
|
serial transmission |
|
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 system
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 |
|
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. 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. |
|---|
|
SNP |
|
Synchronous Network Processor card; an alternative name for an X.25
board. |
|---|
|
spooled device |
|
A printer that is accessed through the 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 |
|
Data bit used to signal the start of a character being transmitted in
an asynchronous communication mode. |
|---|
|
station address |
|
A 12-digit hexadecimal link-level address used by the IEEE 802.3
protocol. Every node on an IEEE 802.3 network has its own station address.
|
|---|
|
stop bit |
|
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.
|
|---|
|
subnet mask |
|
Grouping of bits that determines which bits of the IP address will be
used to define a subnetwork. The subnet mask is configured using the NMMGR
utility and specified in the same format as an IP address.
|
|---|
|
SVC |
|
Switched Virtual Circuit. Path through an X.25 network that is
established at call set-up time. |
|---|
|
switching |
|
See DTC switching.
|
|---|
|
Switching user interface |
|
User interface available when DTC switching is enabled that allows
terminal users to choose the HP 3000 Series 900 computer with which they
want to establish a communication link. |
|---|
|
synchronous |
|
A mode of operation or transmission whereby 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.
|
|---|
|
SYSGEN |
|
The software program that allows you to configure the operating
system on HP 3000 Series 900 computers. |
|---|
|
system configuration |
|
The way you tell the operating system what peripheral I/O devices are
attached and what parameters are required for system operation.
|
|---|
T |
|
TCP |
|
See Transmission Control
Protocol. |
|---|
|
TELENET |
|
A proprietary public data network in the USA. |
|---|
|
Telnet Access Card (TAC) |
|
A card that resides in the DTC 48 and provides protocol conversion
between Telnet and AFCP. |
|---|
|
Telnet Express |
|
See HP ARPA Telnet Express.
|
|---|
|
TermDSM |
|
Terminal online diagnostic support manager. A utility that provides
diagnostic services for DTC connections by means of a series of commands
accessible through the SYSDIAG utility. TermDSM is used only when DTCs are
managed by a host system. |
|---|
|
terminal name |
|
Character string of up to 16 characters specified in the OpenView DTC
Manager configuration (for networks using OpenView Network Management) to
define a terminal by name. May be shared by several terminals (pool port).
|
|---|
|
terminal profile |
|
A set of configuration characteristics that can be associated with
one or more terminals through the NMMGR configuration. Terminal profile
specifications include the terminal type, line speed, device class
assignment, and other values relevant to terminals connected through a DTC.
|
|---|
|
terminal type |
|
A collection of characteristics that cause a terminal connected to an
MPE system to act and react in a specified manner. You may configure a
terminal to use one of the system-supplied terminal types, or you may
create custom terminal types using the workstation configurator.
|
|---|
|
ThinLAN |
|
A LAN media that conforms to the IEEE 802.3 Type 10 BASE 2 standard
LAN. |
|---|
|
ThinLAN 3000/iX Link |
|
Hardware and software necessary to create a broadcast network, which
uses the IEEE 802.3 LAN cable to transmit messages to all the nodes on the
network. The messages are then accepted only by the node or nodes to which
they are addressed. Also includes the ThickLAN and StarLAN 10 options.
|
|---|
|
throughput class |
|
A value assigned to a given virtual circuit that defines how many
network resources should be assigned to a given call. It is determined by
the access line speed, packet and window sizes, and the local network's
internal mechanisms. |
|---|
|
throughput class negotiation |
|
One of the network subscribed facilities defined at subscription time.
This allows the user to negotiate the throughput class at call set-up time.
|
|---|
|
timer (T3) |
|
Length of time that a link can remain in an idle state. After the
expiration of the timer, the link is considered to be in a non-active,
non-operational state and is automatically reset. The value should be
chosen carefully. In particular, it must be sufficiently greater than the
retransmission timer (T1) so that no doubt exists about the link's state.
|
|---|
|
token ring |
|
A collection of data communication systems sharing a common cable and
communicating by means of the IEEE 802.5 protocol. In a token ring network,
access is controlled by the passing of a token from node to node. Outgoing
messages are attached to the token and passed with the token until they
arrive at the node to which they are addressed. |
|---|
|
Token Ring 3000/iX Network Link |
|
Hardware and software required to connect a HP 3000 Series 900 system
to a token ring network. |
|---|
|
topology |
|
The physical arrangement of nodes in a network. Some common
topologies are bus, star, and ring. |
|---|
|
Transmission Control Protocol |
|
TCP. A network protocol that establishes and maintains connections
between nodes. TCP regulates the flow of data, breaks messages into
smaller fragments if necessary (and reassembles the fragments at the
destination), detects errors, and retransmits messages if errors have been
detected. |
|---|
|
Transpac |
|
The national public PSN of France. |
|---|
|
transparent mode |
|
Data transfer scheme in which only a limited number of special
characters retain their meaning and are acted on by the system. All other
characters are considered to be data and are passed through with no
control actions being taken. |
|---|
|
transport, network |
|
Software that corresponds to layers 3 and 4 of the OSI network
architecture model. The function of this software is to send data out over
the appropriate communications link, to receive incoming data, and to
route incoming or outgoing data to the appropriate destination node.
|
|---|
|
TTUTIL |
|
Also known as the Workstation Configurator. A program,
TTUTIL.PUB.SYS, on the HP 3000 that is used to create and modify
terminal and printer type files. |
|---|
|
Tymnet |
|
A proprietary public data network in the USA. |
|---|
|
typeahead |
|
A facility that allows terminal users to enter data before a read is
actually posted to the terminal. |
|---|
U |
|
unacknowledged frame number (K) |
|
The number of frames that can be transmitted without receiving an
acknowledgment from the destination address. When this number (K) frame is
reached, the same K frames are retransmitted. |
|---|
|
unedited mode |
|
See transparent mode.
|
|---|
|
uninterruptible power supply |
|
A hardware device that protects equipment from power failures and
contains an internal storage battery to supply reserve power.
|
|---|
|
UPS |
|
See uninterruptible power
supply. |
|---|
V |
|
V-Series (V.##) CCITT |
|
A set of CCITT recommendations related to data communication over a
voice-grade telephone network. |
|---|
|
V.24 |
|
The CCITT recommendation that defines the function of the interchange
circuits between a DTE and a DCE. |
|---|
|
validation |
|
The process of ascertaining whether the network transport
configuration file has been correctly configured. In guided NMMGR, you do
this by pressing the Validate Netxport key. |
|---|
|
VAN |
|
Value-Added Network. A data communication network that uses and pays
for facilities belonging to another carrier. The value-added package is
then sold to a user. |
|---|
|
VC |
|
See virtual circuit.
|
|---|
|
virtual circuit |
|
A logical association between two physically separate DTEs.
|
|---|
|
Virtual Terminal |
|
A network service that allows a user to establish interactive
sessions on a node. |
|---|
|
VPLUS |
|
Software used to generate screens such as those displayed by NMMGR.
|
|---|
|
VT |
|
See Virtual Terminal.
|
|---|
W |
|
Workstation Configurator |
|
A utility (TTUTIL) that allows users to create customized terminal
and printer types by entering data through a series of VPLUS screens.
|
|---|
X |
|
X.21 |
|
Defines the physical interface between a DTE and a DCE of a public
data network where the access to the network is made over synchronous
digital lines. |
|---|
|
X.25 |
|
Defines the interface between a DTE and a DCE for packet mode
operation on a public data network (PDN). |
|---|
|
X.25 address |
|
The X.25 address provided by the network administration if you are
connected to a public data network (PDN). |
|---|
|
X.25 address key |
|
An X.25 address key is a label that maps a node's IP address to its
X.25 address and its associated X.25 parameters. You have a combined
maximum of 1024 X.25 address keys in the SVC and PVC path tables.
|
|---|
|
X.25 iX System Access |
|
The software that works in conjunction with the DTC/X.25 Network
Access software to provide access to X.25. The software resides on an HP
3000 host and is configured through use of NMMGR. To configure access to
an X.25 network, you must configure two software components: the X.25 iX
System Access (residing on the HP 3000 host), and the DTC/X.25 Network
Access. DTC/X.25 Network Access is configured through use of the OpenView
DTC Manager software for systems using PC-based network management or
through NMMGR for systems using host-based network management.
|
|---|
|
X.25 LUG address |
|
X.25 address of a node belonging to a local user group (LUG).
|
|---|
|
X.29 |
|
Defines the interface for data exchange between a packet-mode DTE and
a remote Packet Assembly/Disassembly (PAD) facility over a packet
switching network. |
|---|
|
X.3 |
|
Defines the user facilities that should be internationally available
from the packet assembler/disassembler (PAD) facility when this is offered
by a public data network. |
|---|
|
X.Series (X.##) CCITT recommendations |
|
A set of recommendations for data communication networks governing
their services, facilities, and the operation of terminal equipment and
interfaces. |
|---|
|
XON/XOFF protocol |
|
Flow control used by MPE/iX systems to protect against data overruns.
XON/XOFF protocol is controlled by the data recipient who sends an XOFF
character (ASCII DC3) to the sender if it is unable to continue to receive
data. The sender suspends transmission until it receives an XON character
(ASCII DC1). |
|---|
