Industrial ETHERNET

Kbps
L2TP
LACP
Kilobit per second (kbit/s)
Layer 2Tunneling Protocol
For configuration of VPNTunnels on
layer 2. See also IPsec.
Link Aggregation Control Protocol.
OSI reference model. It controls access
to the transmission medium. In this
sublayer,processes may be used in
which either several equally authorized
participants are competing for access
(for example CSMA/CA or CSMA/CD)
or in which no collisions occurs, for
example such as token ring.
LAN
Latency Time
LAP
Local Area Network
Term for local network which is typically
no bigger than 10 km in diameter.
Term for the time difference between
the receipt and the relaying of data.
As a rule, the latency time is measured
between the last bit received and first
bit sent out.
Link Access Protocol.
MAC-Address The address of a participant on Layer 2
of the OSI reference model.
MAN
Metropolitan Area Network
Term for a network within a city that
connects various LANs to each other.
MAP
Manufacturing Automotion Protocol
A protocol developed in the early 1980s
on the initiative of General Motors.
However in view of its complexity, it was
hardly used commercially.
LED
Link
Aggregation
Light Emitting Diode
An electronic component that emits light.
Term for a function that combines up
to 4 ports with the same transmission
speed to one virtual port. The result
is redundancy in the case of failure of
a connection. Also called trunking.
MAU
Mbps
Medium Attachment Unit
A coupling module between an
ETHERNET terminal device and the
transmission medium. As a rule
the terminal device is connected to
an AUI interface. Also see Transceiver.
Megabit per second (Mbit/s)
Long Haul
Term for optical transceivers with
a very high link budget that is used in
connection with single-mode fibers.
MD5 Message Digest 5
See also Hash-Algorithm.
LSB
Least Significant Bit
Low-value bit within a bit sequence
(ETHERNET)
MDI
Medium Dependent Interface
Term for the physical (electrical, optical)
and mechanical interface of a device for
connection to the transmission medium.
MDI-X
MDI-Crossover
Term for a MDI interface with crossed
connected signal lines.
LWL
See Fiber Optic Cable.
MDI/MDI-X
See Autocrossing.
LX
MAC
Long Wavelength (Gbit-Ethernet).
Media Access Control
Term for a sublayer of Layer 2 of the
MIB
Management Information Base
A database for objects and functions
which help network management
systems manage individual objects
using Simple Network Management Protocolb
(SNMP).
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