Nortel 1001t Installation Manual page 101

Glossary-7
digital audio tape
A type of magnetic tape that uses a helical scan scheme to
record data. DDS (digital data storage) is the most common
format for DAT cartridges.
digital data storage
DDS is the industry standard for 4 mm helical scan digital audio
tape (DAT) cartridges. See also DAT.
DIMM
The protective packaging for microprocessor chips that provides
a safe and convenient means of installing and removing the
chip.
DIP
A type of protective packaging for silicon memory chips that
provides a safe and convenient means of installing and
removing the chip.
DIP switch
A series of tiny switches built into circuit boards that enables
you to configure a circuit board for a particular type of computer
or application. DIP switches are always toggle switches, which
means they have two possible positions: on or off (or 1 or 0).
direct current
DC, the electrical power used by computers, comes from a
single source (such as a battery) which provides a single voltage
that stays at a constant level. AC, the power provided by utility
companies, must be converted to DC before it can be used in
computer systems.
direct memory access
DMA speeds up system performance by moving blocks of
memory around inside the computer (typically between I/O
Standard 1.0 Nortel Symposium Call Center Server May 1998
1001t Hardware Installation Guide