Specifications

October 8, 2003 Networking Alpha Signs (9700-0112C)
74 Glossary
ISA
Industry Standard Architecture. Expansion slots and the associated circuits. Transfers 16 bits of data at a time
between the add-in board plugged into the slot and the computer.
ISDN
Integrated Services Digital Network. An international communications standard for sending voice, video, and
data over digital telephone lines or normal telephone wires at 64 Kbps (64,000 bits per second) per line.
ISO
International Standards Organization. An international organization that establishes global standards for
communication and information exchange, as well as for many other fields of commercial activity.
jumper
An electrical switch consisting of a number of pins and a connector that can be attached to the pins in a variety
of ways. Different circuits are created by attaching the connector to different pins. Can also be a wire.
knockout
A portion of the wall of an enclosure that can be removed by a hammer, screwdriver, or pliers at the time of
installation in order to provide a hole for the attachment of an auxiliary device, cable, or fitting.
LAN
Local Area Network. A group of computers and other devices connected by a communications link that allows
a device to interact with any other device on that network. The devices are in close proximity, hence the word local.
LAN connectivity
A LAN connection in which one or more displays signs are linked by Alpha Ethernet Adapters or serial
servers.
LAWN
Local Area Wireless Network. A group of computers and other devices connected by a wireless
communications link that allows a device to interact with any other device on that network. A transmitter attached
to a PC broadcasts data to devices equipped with a data receiver. Transmission range is usually limited to a mile,
hence the word local.
LED
Light Emitting Diode. A tiny chip of silicon made to produce light in a variety of colors, including red, green,
yellow, and blue. A semiconductor diode that converts applied voltage to light as is used in digital displays.
LED display
An electronic sign that combines text and graphics to convey a fixed or changeable, moving or unmoving
advertising or locational message. See also electronic display.
LED sign
An electronic sign that combines text and graphics to convey a fixed or changeable, moving or unmoving
advertising or locational message. See also electronic display.
line position
Where a message appears on a sign. Includes top, bottom, middle, and fill.
loopback