NonStop S-Series System Expansion and Reduction Guide

Glossary
G-Series Common Glossary
Glossary-22
dBm
dBm. Decibels as referenced to a milliwatt. A unit of measure that establishes 0 dBm equal
to 1 milliwatt. A negative value represents a decrease in power, and a positive value
represents an increase in power. See also decibel (dB)
.
DC. See direct current (DC).
DCE. See data communications equipment (DCE).
DCF. See dynamic configuration file (DCF).
DCT. See destination control table (DCT).
DC power cable. In system enclosures with power shelves, a cable that delivers DC power
from the power shelf to a processor multifunction (PMF) customer-replaceable unit
(CRU) or I/O multifunction (IOMF) CRU in that enclosure.
decibel (dB). A unit of measure used to express a relative difference in power. A negative
value represents a decrease in power, and a positive value represents an increase in
power.
dedicated service LAN. An Ethernet local area network (LAN) for use by only OSM and
TSM applications. This LAN connects system consoles with the Ethernet ports on the
processor multifunction (PMF) customer-replaceable units (CRUs) in group 01 of an
HP NonStop™ S-series server. A dedicated LAN supports NonStop S-series servers
and system consoles but does not support any other types of servers or workstations.
See also public LAN
.
DEFINE. An HP Tandem Advanced Command Language (TACL) command you can use to
specify a named set of attributes and values to pass to a process.
DEFINES paragraph. An optional paragraph in the CONFTEXT configuration file that
contains one or more identifiers, each with its associated text string. The DEFINES
paragraph, if used, precedes the ALLPROCESSORS paragraph.
delta. A method for connecting a 3-phase power source (or load) in a closed series loop
with input (or output) connections made to each of the three junctions. The delta’s
physical arrangement resembles the delta character from the Greek alphabet.
demon. On a UNIX system, a process that runs continuously to provide a specific service
for other processes. A demon does not have a controlling terminal and is not explicitly
invoked. On an HP NonStop™ system, a demon runs in the Open System Services
(OSS) environment and has an OSS process ID. See also static server
.
destination control table (DCT). The HP NonStop™ Kernel data structure that holds
information about every device and named process in the system. The DCT consists of
the named resource list (NRL)
and the process-pair list (PPL). The DCT is replicated in
each CPU.