Paradyne Compshere 3000 Series Installation Manual page 98

COMSPHERE 3000 Series Carrier
LAN
LATA
LCD
LDM
leased line
LEC
LED
Make Busy
MCMP
MI/MIC
modem
modular circuit card
multiplex
multipoint circuit
multipoint line
MUX
network address
Glossary-6
Local Area Network. A network that spans a small geographic area (e.g., a building).
Local Area Transport Area. A region served by a LEC that consists of one or more area
codes.
Liquid Crystal Display. Thin glass plates containing liquid crystal material. When voltage is
applied, the amount of light able to pass through the glass plates is altered so that messages
can be displayed.
Limited-Distance Modem (also called a local area data set or LADS).
A private telephone line connection exclusively for the user. No dialing is necessary.
Local Exchange Carrier. A company that provides intra-LATA (local exchange carrier)
telecommunications services, like NYNEX or Bell South.
Light-Emitting Diode. A light or status indicator on the control panel that glows in response
to the presence of a certain condition (e.g., an alarm).
An additional capability for DDD NIMs. This feature is useful when modems are used in a
''hunt" or ''rotary" group. The Make Busy feature ties the Tip and Ring signals together so
that the modem appears busy.
Multichannel Multipoint. A circuit card that enables the support of up to six independent
applications over a single multipoint digital facility. The MCMP capability can support up to
40 tributary DSUs, each optioned with an MCMP card.
Mode Indicate and Mode Indicate Common. A control signal method which causes the
associated modem to go off-hook in the Originate mode. With MI/MIC signaling, two leads
are provided, usually via Pins 3 and 6 of an 8-position modular VF connector: Mode
Indicate and Mode Indicate Common. Actuation of the signal is by momentary connection
of these two leads.
MOdulator/DEModulator. A device used to convert data from a digital signal to an analog
signal so that data can be transmitted over a telephone line. Once the data is received, the
analog signal is converted back into a digital signal.
A circuit card that contains gold finger contacts on the rear edge of the circuit card. A
modular circuit card can be removed from the front of the carrier without disturbing DTE
cables.
To combine many low-speed data sources into a single, high speed serial data stream. The
data is coded at transmission, and decoded at reception. Some multiplexing techniques
include Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), and
Statistical Multiplexing (Stat MUX).
A special type of circuit where one control device communicates in a broadcast mode with
one or more tributary devices. Communication from a tributary device is always directly to
the control device, and not to any of the other tributary devices.
A circuit connecting one control modem with one or more tributary modems.
Multiplexer. A device that enables the simultaneous transmission of multiple independent
data streams into a single high-speed data stream.
The user-assigned identification number for a particular device. The network address is used
by a node to communicate with other nodes connected to it.
July 1999 3000-A2-GA31-D0