Siemens HiPath 2000 Administration Manual page 184

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Glossary
MDI-X
Media Dependent Interface 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
Management Information Base. A type of database used to manage the devices in a com-
munications network.
MWI
Message Waiting Indicator. A signal, typically a LED, to notify the user that new mailbox
messages have arrived.
P
PBX
Private Branch Exchange. Private telephone system that connects the internal devices to
each other and to the ISDN network.
PCM
Pulse Code Modulation. A digital representation of an analog signal, e. g. audio data,
which consists of quantized samples taken in regular time intervals.
PING
Packet Internet Gro(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
Power over Ethernet. The IEEE 802.3af standard specifies how to supply power to com-
pliant 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.
PSTN
Public Switched Telephone Network. The network of the world's public circuit-switched
telephone networks.
Q
QoS
Quality of Service. The term refers to control mechanisms that can provide different priority
to different users or data flows, or guarantee a certain level of performance to a data flow
in accordance with requests from the application program. The OpenStage phone allows
for the setting of QoS parameters on layer 2 and layer 3 (DiffServ).
6-4
HiPath 2000/3000/5000 - OpenStage Family, Administration Manual
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A31003-S2010-M100-10-7619, 27/08/2008