Installing and Administering OSI Transport Services

Glossary 147
Glossary
NSAP A unique value that
defines a system’s address for use
when establishing network
connections among various
systems.
open system interconnection
See OSI
OSI Open System Interconnection
reference model defined by the
International Standards
Organization (ISO). It establishes
a data communication
architectural model for networks.
OTS HP’s term for the OSI
transport services.
packet A sequence of binary digits
that is transmitted as a unit in a
computer network. A packet
usually contains control
information plus data.
PID A unique identification
number assigned to all processes
by the operating system.
port A software access point for
data entry or exit to a network
controller.
process identifier See PID
protocol A specification for
transferring information between
computers on a network.
redundancy Duplication of
service. Networks can provide
redundancy to increase the
probability that communications
can continue despite various
failures.
remote Not directly connected or
processed at another location.
RFC1006 Allows OSI
communication over TCP/IP
connections as described in
RFC1006 and RFC1277.
routing node A node that is able
to transmit packets between
similar networks. A node that
transmits packets between
dissimilar networks is called a
gateway.
SAP Service access points between
network layers.
selector A sequence of octets
(bytes) used to identify a SAP;
referred to as p-selector, s-selector,
and t-selector to identify the OSI
layer association.
service access point See SAP