6 The source code or binary module for the Acis Operating System
7 (also know as AOS and IBM/4.3).
9 An instance of a program that is
10 running in unprivileged mode, in the unprivileged address space
11 commonly know as "user address space", in other words, not
14 Interprocess communication, the mechanism by which two different
15 user processes send messages to each other.
17 ACIS Operating System, the IBM ACIS port of Berkeley Unix 4.3BSD.
19 Protocol control block. Each instance of a protocol machine
20 keeps status information, addresses, and in some cases queues
21 in a pcb for each connection or socket.
23 In the Berkeley Unix environment, a domain is an abstract entity which
24 comprises a network architecture, addressing scheme, address format,
25 network protocols, and transport protocols.
26 .sh 1 "Transport Layer Terms"
28 ISO Draft International Standard 8073, Transport Protocol Specification
30 The collection of transport
31 classes that have been implemented in ARGO, classes 0 and 4.
32 Also means the ARGO implementation of TP.
37 .ip "Transport entity" 5
38 Software or hardware that implements the elements of procedure
39 described in ISO 8073.
40 .ip "Transport user" 5
41 User process that make use of the services
42 provided by a transport entity.
43 .ip "Transport service interface" 5
44 The syntax and semantics of the set of procedures, functions, and system calls
45 that are invoked by a transport user,
46 through which the services of the transport entity are delivered.
48 Transport protocol data unit, a packet that is
49 passed from one transport entity to another.
51 Transport service data unit, the logical unit of data that is
52 passed from a transport entity to a transport user, or from
53 a transport user to a transport entity.
55 Connection request TPDU.
57 Connection confirm TPDU.
59 Disconnect request TPDU.
61 Disconnect confirm TPDU.
67 Normal data acknowledgment TPDU.
69 Expedited data acknowledgment TPDU.
72 .sh 1 "Network Layer Terms"
74 ISO Draft International Standard 8473, connectionless network protocol.
76 Connection Oriented Network Service.
78 Connection Oriented Sub-Network Service.
80 Connectionless Network Service.
82 Connectionless Network Protocol, or ISO 8473.
84 Software or hardware that implements the elements of procedure described
86 .ip "Network Service User"
87 Software components that make use of the services provided by a network
89 .ip "Network Service Provider"
90 Software components that provide the services of a network entity.
92 Network Service Access Point. The point at which the OSI network service
93 is made available to the network service user by the network service
96 Information that the network service provider needs to identify an
97 NSAP. The source and destination address fields of a CLNP packet
100 End system. A system running the complete suite of OSI protocols which can
101 act as an end point for communication.
103 Intermediate system. A system running the OSI layers 1, 2, and 3 which
104 can act only a packet router.
106 The Subnetwork Point of Attachement is the point where a \fIreal\fR
107 end or intermediate system is attached to a \fIreal\fR subnetwork.
109 Information that a \fIreal\fR subnetwork need to identify a \fIreal\fR end
110 or intermediate system. This is commonly referred to as the hardware address.
112 Network Protocol Data Unit. The unit of data which is exchanged between
119 A NPDU carrying the whole of the user data from an N-UNITDATA request.
121 a NPDU whose field ar identical to those of an initial NPDU, except that it
122 carries only a segment of the user data from an N-UNITDATA request.
124 A distinct unit of data consisting of part or all of the user data provided
125 in the N-UNITDATA request and delivered in the N-UNITDATA indication.
127 The act of generation two or more derived NPDUs from an initial or derived
130 A DoD Internet Protocol term with the same meaning as "segment". Used
131 synonymously with "segment."
133 A DoD Internet Protocol term with the same meaning as "segmentation". Used
134 synonymously with "segmentation."
136 The act of regenerating an initial NPDU from two ore more derived NPDUs.
138 Maximum transmission unit. The maximum size of a packet that can be
139 transmitted on a medium or through a protocol.
140 For example, the MTU of the TP protocol is 8192 bytes, the MTU
141 of and Ethernet device is 1500 bytes, and the MTU of the OSI Network
142 service is 512 bytes.
143 .ip "Network interface"
144 The device used to attach a computer to a network, for example,
145 an Ethernet adapter, or a Token Ring adapter.
146 This unfortunate terminology is inherited from BSD Unix.