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G
LOSSARY
Layer 3
Network layer of the OSI Reference Model. Defines
protocols for routing data by opening and
maintaining a path on the network between systems
to ensure that data arrives at the correct destination
node.
LED
Light emitting diode. Semiconductor device that
emits light produced by converting electrical energy.
Status lights on hardware devices are typically LEDs.
load-sharing
The ability of a router to distribute traffic over all its
network ports that are the same distance from the
destination address. Good load-balancing algorithms
use both line speed and reliability information. Load
balancing increases the utilization of network
segments, thus increasing effective network
bandwidth.
local management
Local management of a network device via a
connected terminal.
MIB
Management Information Base. A database of
network management information that describes the
specifics of individual network components.
MLAN
High speed management busses that provide
intermodule communication and network and
network connectivity to the SMC (System
Management Component).
MMF
Multi-mode fiber. An optical fiber with a core
diameter of from 50 to 100 microns. It is the most
commonly used optical fiber for short distances such
as LANs. Light can enter the core at different angles,
making it easier to connect the light source. However,
light rays bounce around within the core causing
some distortion and providing less bandwidth than
singlemode fiber.
modem
Modulator/demodulator. The device that converts
serial digital data from a transmitting terminal to a
signal suitable for transmission over a telephone
(analog) channel. At the other end, another modem
converts the analog signal to digital data for use by
the computers. A modem port provides the interface
for remote management of Switch systems. An
external modem can be connected to the serial port
of the system processor.
multicast
A special form of broadcast where copies of the
packet are delivered only to a subset of all possible
destinations.
multiplexing
A function within a layer that interleaves the
information from multiple connections into one
connection.
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