PAM Programming Manual

Glossary
PAM Programming Manual—142482
Glossary-4
logical interface
that is located in a small geographical area, whose communications technology provides
a high-bandwidth, low-cost medium to which low-cost nodes can be connected.
logical interface. The interface that allows an application or another process to communicate
with data communications hardware.
logical link control 1 (LLC1) ports. The ports that allow access to an LLC type 1
connectionless (IEEE 802.2) level 2 interface.
logical link control 2 (LLC2) ports. The ports that allow access to an LLC type 2
connection-oriented (IEEE 802.2) level 2 interface.
media access control (MAC) address. A unique 32-bit number that is encoded in a device's
circuitry to identify it on a network. Ethernet MAC addresses differ from token-ring
MAC addresses. Token-ring MAC addresses reverse the bit sequence of each nibble (4
bits) of the 32-bit number, and then place the MAC address on the network in reverse
order.
modifier. A word, used in the PROFILE file, that defines I/O process characteristics at
system start-up. Its function is to override preset characteristics or to describe additional
characteristics of a device or a process.
MSAP. Used to define an access point in PAM that provides message-system access to a
SNAX process.
NAMES. A nonsensitive SCF command that returns a list of the object names and types
subordinate to the specified object.
nonsensitive command. A DSM command that can be issued by any user or program
allowed access to the target subsystem.
null object type. A place-holder object type that management applications can use in
commands that do not require explicit specification of a particular object type. For the
PAM subsystem, the NAMES and VERSION commands require no object type.
OBEY. A nonsensitive SCF command that causes commands to be read from a specified
file—a command (OBEY) file.
object. One or more of the devices, lines, processes, and files in a Tandem subsystem; any
entity subject to independent reference or control by one or more subsystems.
In the Subsystem Control Facility (SCF), an object is a resource controlled by a
subsystem. Objects include processes, disk files, data communications lines, display
devices, and groups of devices or communications lines. Each object has an object type
and an object name. The object type describes the type of the object, such as LINE, SU
(subdevice), PROCESS, and so on. The object name uniquely identifies an object within
the system.