6760 ServerNet/DA Manual

Glossary
6760 ServerNet/DA Manual—424879-003
Glossary-65
phase-loss detector/contactor (PDC)
phase-loss detector/contactor (PDC). Equipment used to detect the interruption (for 50
milliseconds or longer) or the complete loss of one or more phases of power to
computer equipment. Upon detection of a phase dropout, the contactor shuts down all
input phases to the system equipment, thereby allowing smooth system shutdown and
recovery.
physical interface (PIF). The hardware components that connect a system node to a
network.
physical link interfaces. Communications standards defined by standards organizations.
The following physical link interfaces are supported for the ServerNet wide area
network (SWAN) concentrator: RS-232, RS-442, RS-449, V.35, and X.21.
Physical view. One of several views of a server available in the view pane of the
Management window of the Compaq TSM package. A Physical view of a server is a
view of all the enclosures and is intended to represent the actual floor plan at the site.
A Physical view of an enclosure is a visual representation of the physical placement of
supported resources inside the enclosure. See also Connection view
.
PIB. See power interface board (PIB).
PIC. See plug-in card (PIC).
PID. In the Open System Services (OSS) environment, a synonym for process ID. OSS
process ID is the preferred term in HP NonStop™ S-series system publications.
In the Guardian environment, PID is sometimes used to mean either:
•
A Guardian process identifier such as the process ID
•
The cpu, pin value that is unique to a process within a node (see HP NonStop™
Kernel user ID)
PIF. See physical interface (PIF).
PIN. See process identification number (PIN).
ping. A utility used to verify connections to one or more remote hosts. The ping utility uses
the Internet control message protocol (ICMP)
echo request and echo reply packets to
determine whether a particular IP system on a network is functional. The ping utility is
useful for diagnosing IP network or router failures.
pipe. In the Open System Services (OSS) environment, an unnamed FIFO, created
programmatically by invoking the
pipe() function or interactively with the shell pipe
syntax character (
|). A shell pipe redirects the standard output of one process to
become the standard input of another process. A programmatic pipe is an
interprocess communication mechanism.
planned outage. Time during which a computer system is not capable of doing useful work
because of a planned interruption. A planned outage can be time when the system or