NonStop System Glossary

data segment
A virtual memory segment holding data. Every process begins with its own data segments for
program global variables and runtime stacks (and for some libraries, instance data). Additional
data segments can be dynamically created. See also flat segment and selectable segment.
data terminal equipment (DTE)
Equipment that constitutes the data source or data sink and provides for the communication control
function protocol. It includes any piece of equipment at which a communication path begins or
ends.
data transparent
Describes software that examines all eight bits of every data byte and that uses no bit in a data
byte for its own purposes. Internationalized applications must be data transparent.
dB
See decibel (dB).
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).
DC power cable
In NonStop S-series 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 2 (IOMF 2) CRU in that enclosure.
DCE
See data communications equipment (DCE).
DCF
See dynamic configuration file (DCF).
DCT
See destination control table (DCT).
DDR
Double data rate.
Debug With Arbitrary Record Format (DWARF)
A standardized debugging data format. HP debugging tools such as Native Inspect read DWARF-2
for debugging information in Executable and Linkable Format (ELF).
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.
D 69