HP 3000 Manuals HP 3000 Manuals
Glossary (n - z) nailed device A device with a permanently assigned ldev. The assignment is established through the system configuration of the MPE/iX host system. Nailed devices can be accessed programmatically through their ldev number. Nailed devices can also be assigned to more than one host. 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 LAN802.3, router (point-to-point), X.25, 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. Network Services NS. Software application products that can be used to access data, initiate processes, and exchange information among nodes in the network. The HP 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. NFT Network File Transfer. The network service that transfers disk files between nodes on a network. NI See network interface. NLP Name Lookup Protocol. A protocol used when setting up links between DTCs, as happens when DTCs are used in a back- to-back configuration. NMCONFIG.PUB.SYS The file that contains all of 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 Service (NS) products running on the system. This is the only file name allowed at run-time. NMDUMP A utility used to format log and trace files. NMMAINT A utility that lists the software module version numbers for all HP AdvanceNet products, including NS3000/ 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 an HP 3000 Series 900 computer. NMMGRVER A conversion program called NMMGRVER.PUB.SYS. It converts configuration files created with NMMGR from an earlier version to the latest format. NMSAMP1.PUB.SYS A sample configuration file supplied with FOS that can be used as a template for DTS configuration. NMSTART.PUB.SYS The file which contains maintenance mode commands executed during NMMGR startup. 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. The IP address 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 A list defined on the OpenView windows workstation and subsequently downloaded to all DTCs for which it is the "owner." The list specifies all of 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 an MPE/iX system, 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 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. NS3000/iX A Hewlett-Packard data communication product that provides networking capabilities for MPE/iX based HP 3000 minicomputers. NS3000/iX consists of a link and network services. NS3000/iX Link Software and hardware that provides the connection between nodes on a network. Some of the NS3000/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 StarLAN 10 3000/iX link. NS3000/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. NSDIR.NET.SYS Name of the active network directory file. See also network directory. octet An eight-bit byte operated upon as an entity. OpenView HP OpenView Windows is HP's network management environment. It provides the basic services for accessing and managing networks used by the DTC Manager, and other applications, such as Switch/PAD Manager, Hub Manager, etc. 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 is used to draw the network map and to label the components on it. OpenView DTC Manager An OpenView Windows application that enables you to configure, control, monitor, and troubleshoot the operation of the Datacommunications 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 he 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. packet A block of data whose maximum length is fixed. The unit of information exchanged by X.25 at Level 3. The types of packets 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 NS3000/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 (defined by the DTC Manager) and the MPE/iX systems (defined by NMMGR) that the device can access. PAD profile A 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 a screen 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 a 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 A 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 an MPE/iX 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 NS3000/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 that govern each layer of network architecture. They define which functions are to be performed and how messages are to be exchanged. PSN Packet-Switching Network. Any data communication network in which 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 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. 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 timer (T1) 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). 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. 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. SYSGEN The software program that allows you to configure the operating system on HP 3000 Series 900 computers. system configuration The method for telling MPE/iX which peripheral I/O devices are attached to the DTC and which parameters are required for system operation. 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 System 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 an MPE/iX host system. terminal name A 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. It can 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/iX system to act and react in a specified manner. You can configure a terminal to use one of the system-supplied terminal types, or you can create custom terminal types using the Workstation Configurator. ThinLAN 3000/iX A LAN that conforms to the IEEE 802.3 Type 10 BASE 2 standard LAN. 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) The 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. 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 A 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. It sends data out over the communications link, receives incoming data, and routes incoming or outgoing data to the appropriate destination node. TS8 See HP TS8. 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. UPS See uninterruptible power supply. 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. 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. This is accomplished by using the NMMGR Validate Configuration File screen. 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. V-Series (V.##) CCITT A set of CCITT recommendations related to data communication over a voice-grade telephone network. VT See Virtual Terminal. WAN Wide Area Network. A data communications network of unlimited size, used for connecting localities, cities, and countries. Workstation Configurator A utility available on MPE/iX systems, TTUTIL.PUB.SYS, that allows users to create customized terminal and printer types by entering data through a series of VPLUS screens. X.3 The protocol that defines which user facilities should be internationally available from a packet assembler/disassembler (PAD) when this is offered by a public data network. X.21 The protocol that 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 The protocol that 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 LUG address X.25 address of a node belonging to a LUG. X.25 iX System Access The software that works in conjunction with the DTC/X.25 Network Access software to provide MPE/ iX 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 and the DTC/X.25 Network Access (residing on the Datacommunications and Terminal Controller and configured at the OpenView Windows Workstation). Together, these two components provide a network connection on HP 3000 systems to private and public X.25 packet-switched networks (PSNs). X.29 The protocol that defines the interface for data exchange between a packet-mode DTE and a remote Packet Assembly/ Disassembly (PAD) facility over a packet- switching network. XON/XOFF protocol The 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). X.Series (X.##) CCITT recommendations A set of recommendations for data communication networks governing their services, facilities, and terminal equipment operation and interfaces.