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Alphabetical Reference
MIB
Abbreviation for "Management Information Base".
Database containing descriptions of error messages of the devices and
functions in a network.
PBX
Abbreviation for "Private Branch eXchange".
Private telephone system that connects the different internal devices to
the ISDN network
PING
Abbreviation for "Packet Internet Groper".
A program to test whether a connection can be made to a defined
IP target. Data is sent to the target and returned from there during the
test. The result of the test displays the success / failure of the transmission
and possible additional information such as the transmission time.
Port
Ports are used in
tions simultaneously. Different services often have different port numbers.
PSS
Abbreviation for "Pre Shared Secret".
The PSS key is the master key used for data encryption in VoIP .
QoS
Abbreviation für „Quality of Service".
Describes the subjectively ascertainable quality (service quality) of a voice
connection through
packet delay, delay deviation, reserved bandwidth, type and bit rate (vari-
able, constant or unspecified).
RAM
Abbreviation for "Random Access Memory".
Memory with read / write access.
ROM
Abbreviation for "Read Only Memory".
Memory with read only access.
RTP
Abbreviation for „Realtime Transport Protocol" .
86
Abbreviations and Specialized Terms
IP networks to permit several communication connec-
IP networks. Properties of QoS are packet loss rate,
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