OSI/AS Configuration and Management Manual

Glossary
OSI/AS Configuration and Management Manual—424119-001
Glossary-6
Open Systems Interconnection (OSI)
Open Systems Interconnection (OSI). A set of standards used for the interconnection of
heterogeneous computer systems, thus providing universal connectivity.
Open Systems Interconnection (OSI) address. The address of an object on the network,
which includes the network service access point (NSAP)
, transport selector (TSEL),
session selector (SSEL), and presentation selector (PSEL). See also Open Systems
Interconnection (OSI).
Open Systems Interconnection (OSI) manager process. A process in the Open Systems
Interconnection (OSI) subsystem that performs subsystem management functions,
including management of the Management Information Base (MIB). There is one OSI
manager process per OSI subsystem. See also Open Systems Interconnection (OSI).
Open Systems Interconnection (OSI) Reference Model. A communications architecture,
adopted by the International Standards Organization (ISO) in 1984, that includes seven
layers that define the functions involved in communications between two systems, the
services required to perform these functions, and the protocols associated with these
services. See also Open Systems Interconnection (OSI)
.
Open Systems Interconnection (OSI) subsystem. One Open Systems Interconnection (OSI)
manager process controls one or more TAPS and TSP processes. The OSI manager
processes communicates with NSP processes but do not control them. The OSI manager,
TAPS, TSP, and NSP processes can be on the same or different nodes within the same
Expand network. See also Open Systems Interconnection (OSI)
and Open Systems
Interconnection (OSI) manager process.
OSI/AS. See Compaq OSI/AS.
OSI/FTAM. See Compaq OSI/FTAM.
OSI/MHS. See Compaq OSI/MHS.
OSI/TS. See Compaq OSI/TS.
X25AM Physical Layer. Layer 1 in the Open Systems Interconnection (OSI) Reference
Model. This layer establishes the actual physical connection between the network and
the computer equipment. Protocols at the Physical Layer include rules for the
transmission of bits across the physical medium and rules for connectors and wiring.
PAM. See Port Access Method.
Port Access Method (PAM). A Compaq communications subsystem that provides an
independent interface to allow applications access to token-ring or Ethernet local area
networks (LANs) on Himalaya S-series servers. The PAM subsystem provides a port
interface that applications can use by making file-system procedure calls. The PAM
subsystem implements, for LANs, the services of the Data Link Layer
and layers below.
PAM replaces the Tandem LAN Access Method (TLAM)
for G06 and later releases.
port address. For X.25 Access Method (X25AM)
lines, the logical port number used to
specify the address of the connection to the X.25 network. For Tandem LAN Access