72 List of terms
Analog signal
ANI
Ampere
Backplane
Battery back-up
BISDN
BTU
Capacity
Cards
Card Cage
A signal that varies in a continuous manner such as voice or music.
An
analog signal may be contrasted with a digital signal which represents only
discrete states.
The signal put out by a data set has both analog
.zuid
discrete
characteristics.
Automatic Number Identification.
A unit of electrical current or the rate of flow of electricity which is equal to
watts divided by volts.
A printed circuit board that extends throughout the length of the shelf and
connects
to
the circuit pack connectors.
Also known as a motherboard.
System power furnished by stand-by batteries that are charged by a charger.
If commercial power fails, the batteries will maintain service for a limited
period of time determined by the size of the batteries and the traffic on the
system.
Basic Rate Integrated Services Digital Network.
British thermal unit. The quantity of heat required to raise the temperature
of one pound of water one degree Fahrenheit at a specified temperature (as
39”
E).
Also means Bus Terminating Unit.
The information-carrying ability of a telecommunications facility, group,
network, or system measured in Bits Per Second.
See circuit packs.
Also referred to as card chassis. A frame for holding circuit cards in a
microprocessor. A standard cage holds nine cards; units with motherboards
can hold up to 20 cards.
System overview 553-3001-l 00