Glossary
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A31003-S2000-M102-3-76A9, 08/07/2009
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Asterisk - OpenStage Family, Administration Manual
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LLDP
L
ink
L
ayer
D
iscovery
P
rotocol (IEEE Standard 802.1AB). Provides a solution for the dis-
covery of elements on a data network and how they are connected to each other.
M
MAC Address
M
edia
A
ccess
C
ontrol address. Unique 48-bit identifier attached to network adapters.
MDI-X
M
edia
D
ependent
I
nterface crossover (
X
). The send and receive pins are inverted. This
MDI allows the connection of two endpoints without using a crossover cable. When Auto
MDI-X is available, the MDI can switch between regular MDI and MDI-X automatically, de-
pending on the connected device.
MIB
M
anagement
I
nformation
B
ase. A type of database used to manage the devices in a com-
munications network.
MWI
M
essage
W
aiting
I
ndicator. A signal, typically a LED, to notify the user that new mailbox
messages have arrived.
P
PBX
P
rivate
B
ranch E
x
change. Private telephone system that connects the internal devices to
each other and to the ISDN network.
PCM
P
ulse
C
ode
M
odulation. A digital representation of an analog signal, e. g. audio data,
which consists of quantized samples taken in regular time intervals.
PING
P
acket
In
ternet
G
ro(u)per. A program to test whether a connection can be made to a de-
fined IP target. Data is sent to the target and returned from there during the test.
PoE
P
ower
o
ver
E
thernet. The IEEE 802.3af standard specifies how to supply power to compli-
ant devices over Ethernet cabling (10/100Base-T).
Port
Ports are used in ->IP networks to permit several communication connections simulta-
neously. Different services often have different port numbers.