Guardian User's Guide

Guardian User’s Guide—425266-001
Glossary-1
Glossary
access path. The route between a processor and a physical device such as a disk, through
either port of a dual-ported controller. Each device in your system has one or more
access paths configured for it. Devices can have primary and backup access paths that
allow nonstop operation of the device.
•
The primary access path originates in the primary processor and is the route of first
choice to a device.
•
The backup access path originates in the backup processor and is the route of
second choice to a device. For single-port devices (devices connected to only one
controller), the backup path always becomes the active path in the event of any
failure to access the device by the primary path.
Account Quality Planning (AQP) Service. Compaq AQP provides services for improving
your current operations management processes.
adapter. See ServerNet adapter
.
alias. A definition that can provide an alternate name for a TACL command.
Alliance program. A program that Compaq has developed with third parties to augment
Compaq offerings. Alliance partners offer consulting services, products, and application
development services.
ANSI format. A standard tape-label format supported on Compaq NonStop™ Kernel
systems. Other formats include BACKUP and TMF. See also IBM format
.
asynchronous. A mode of serial-data transmission in which characters are sent at random
and the transmission is not synchronized with a separate clock signal; that is, there is no
timing relationship between the end of one character and the start of the next. The data
contains extra bits: a start bit to signal the beginning of a byte and one or more stop bits
to signal the end of the byte. These start and stop bits allow the receiver to determine the
correct synchronization. Contrast with “synchronous.”
ATP6100 Communications Access Process (CAP). ATP6100 Communications Access
Process (CAP) provides the capability to communicate over a variety of asynchronous
communication devices (especially terminals and printers) in the 6100 Communications
Subsystem (CSS). Application data is passed to one of several protocol modules by
ATP6100. The protocol module gives the application extensive control over the line,
and each protocol module can control either a single line or multiple lines.
ATP6100 subsystem. ATP6100 provides the means for an application program to use
asynchronous point-to-point terminals, printers, and other devices connected through the
WAN concentrator. A communications access process and download module that
provides software for asynchronous point-to-point terminal support.