Alphabetical Reference Abbreviations and Specialized Terms
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QoS
Abbreviation für „Quality of Service".
Describes the subjectively ascertainable quality (service quality) of a voice
connection through Æ IP networks. Properties of QoS are packet loss rate,
packet delay, delay deviation, reserved bandwidth, type and bit rate (varia-
ble, 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.
SIP
Abbreviation for "Session Initiation Protocol".
Protocol standard for initialising calls in Æ IP networks.
VLAN
Abbreviation for "Virtual Local Area Network".
Subdivision of an Æ IP network into autonomous administration groups
(domains). A possibility of characterizing the association with a VLAN is us-
ing a Æ Virtual LAN ID.
SNMP
Abbreviation for "Simple Network Management Protocol".
The protocol is used for communication with servers that takeover net-
work management functions. This includes for example, protocolling er-
rors that occur in network components (SNMPTrap).
SNTP
Abbreviation for "Simple Network Time Protocol".
The protocol is used between timeservers and terminal devices of a net-
work to synchronize the time of the terminal device.
Subnet Mask
Classifies networks in A-, B- and C networks. Each class has a subnet
mask that demasks the relevant bits. 255.0.0.0 for Class A, 255.255.0.0 for
Class B and 255.255.255.0 for Class C. In a Class C network, for instance,
there are 254 Æ IP addresss.
Switch
Transmission position in a star-shaped network.
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