147 lines
5.3 KiB
Plaintext
147 lines
5.3 KiB
Plaintext
.\" $NetBSD: def.nr,v 1.2 1998/01/09 06:34:40 perry Exp $
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.\"
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.NC "Definitions"
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.sh 1 "General Terms"
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.ip "Kernel" 5
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The source code or binary module for the Acis Operating System
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(also know as AOS and IBM/4.3).
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.ip "User process" 5
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An instance of a program that is
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running in unprivileged mode, in the unprivileged address space
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commonly know as "user address space", in other words, not
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part of the kernel.
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.ip "IPC" 5
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Interprocess communication, the mechanism by which two different
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user processes send messages to each other.
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.ip "Unix, AOS" 5
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ACIS Operating System, the IBM ACIS port of Berkeley Unix 4.3BSD.
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.ip "PCB, pcb" 5
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Protocol control block. Each instance of a protocol machine
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keeps status information, addresses, and in some cases queues
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in a pcb for each connection or socket.
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.ip "Domain" 5
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In the Berkeley Unix environment, a domain is an abstract entity which
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comprises a network architecture, addressing scheme, address format,
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network protocols, and transport protocols.
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.sh 1 "Transport Layer Terms"
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.ip "ISO 8073"
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ISO Draft International Standard 8073, Transport Protocol Specification
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.ip "TP" 5
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The collection of transport
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classes that have been implemented in ARGO, classes 0 and 4.
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Also means the ARGO implementation of TP.
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.ip "TP 0" 5
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Transport class 0.
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.ip "TP 4" 5
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Transport class 4.
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.ip "Transport entity" 5
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Software or hardware that implements the elements of procedure
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described in ISO 8073.
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.ip "Transport user" 5
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User process that make use of the services
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provided by a transport entity.
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.ip "Transport service interface" 5
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The syntax and semantics of the set of procedures, functions, and system calls
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that are invoked by a transport user,
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through which the services of the transport entity are delivered.
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.ip "TPDU" 5
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Transport protocol data unit, a packet that is
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passed from one transport entity to another.
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.ip "TSDU" 5
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Transport service data unit, the logical unit of data that is
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passed from a transport entity to a transport user, or from
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a transport user to a transport entity.
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.ip "CR TPDU" 5
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Connection request TPDU.
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.ip "CC TPDU" 5
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Connection confirm TPDU.
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.ip "DR TPDU" 5
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Disconnect request TPDU.
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.ip "DC TPDU" 5
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Disconnect confirm TPDU.
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.ip "DT TPDU" 5
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Normal data TPDU.
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.ip "XPD TPDU" 5
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Expedited data TPDU.
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.ip "AK TPDU" 5
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Normal data acknowledgment TPDU.
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.ip "XAK TPDU" 5
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Expedited data acknowledgment TPDU.
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.ip "ER TPDU" 5
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Error TPDU.
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.sh 1 "Network Layer Terms"
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.ip "ISO 8473"
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ISO Draft International Standard 8473, connectionless network protocol.
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.ip "CONS"
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Connection Oriented Network Service.
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.ip "COSNS"
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Connection Oriented Sub-Network Service.
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.ip "CLNS"
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Connectionless Network Service.
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.ip "CLNP"
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Connectionless Network Protocol, or ISO 8473.
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.ip "Network Entity"
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Software or hardware that implements the elements of procedure described
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in ISO 8473.
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.ip "Network Service User"
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Software components that make use of the services provided by a network
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entity.
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.ip "Network Service Provider"
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Software components that provide the services of a network entity.
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.ip "NSAP"
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Network Service Access Point. The point at which the OSI network service
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is made available to the network service user by the network service
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provider.
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.ip "NSAP address"
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Information that the network service provider needs to identify an
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NSAP. The source and destination address fields of a CLNP packet
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are NSAP addresses.
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.ip "ES"
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End system. A system running the complete suite of OSI protocols which can
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act as an end point for communication.
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.ip "IS"
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Intermediate system. A system running the OSI layers 1, 2, and 3 which
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can act only a packet router.
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.ip "SNPA"
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The Subnetwork Point of Attachement is the point where a \fIreal\fR
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end or intermediate system is attached to a \fIreal\fR subnetwork.
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.ip "SNPA address"
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Information that a \fIreal\fR subnetwork need to identify a \fIreal\fR end
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or intermediate system. This is commonly referred to as the hardware address.
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.ip "NPDU"
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Network Protocol Data Unit. The unit of data which is exchanged between
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network entities.
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.ip "DT NPDU"
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Normal data NPDU.
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.ip "ER NPDU"
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Error report NPDU.
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.ip "Initial NPDU"
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A NPDU carrying the whole of the user data from an N-UNITDATA request.
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.ip "Derived NPDU"
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a NPDU whose field ar identical to those of an initial NPDU, except that it
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carries only a segment of the user data from an N-UNITDATA request.
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.ip "Segment"
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A distinct unit of data consisting of part or all of the user data provided
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in the N-UNITDATA request and delivered in the N-UNITDATA indication.
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.ip "Segmentation"
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The act of generation two or more derived NPDUs from an initial or derived
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NPDU.
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.ip "Fragment"
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A DoD Internet Protocol term with the same meaning as "segment". Used
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synonymously with "segment."
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.ip "Fragmentation"
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A DoD Internet Protocol term with the same meaning as "segmentation". Used
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synonymously with "segmentation."
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.ip "Reassembly"
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The act of regenerating an initial NPDU from two ore more derived NPDUs.
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.ip "MTU"
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Maximum transmission unit. The maximum size of a packet that can be
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transmitted on a medium or through a protocol.
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For example, the MTU of the TP protocol is 8192 bytes, the MTU
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of and Ethernet device is 1500 bytes, and the MTU of the OSI Network
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service is 512 bytes.
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.ip "Network interface"
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The device used to attach a computer to a network, for example,
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an Ethernet adapter, or a Token Ring adapter.
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This unfortunate terminology is inherited from BSD Unix.
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