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SDU (OSI)
A unit of data that has been passed down from an OSI layer to a lower layer and has not been encapsulated yet
PDU (OSI)
A unit of data that is created when a layer of the OSI model needs additional operations (like fragmentation) on data. It is composed with a header determining its position in stream or properties
PSTN
The most commonly used telephone network standard. Consists of POTS and ISDN services
POTS
The oldest telephone service. It is the analog voice transmission in 300-3400 Hz frequency range with DTMF signaling system
ISDN
The technology that allows usage of old PSTN networks for providing access to new digital services
DTMF
Signaling system used in old telephone networks. It is used to send control commands via telephone networks using audio tones (you can hear those commands as sounds in your phone)
WMI
The technology used in publishing information about the host and receiving information from other hosts in Windows networks
Multiplexing
It's a technique of sending several signals through one transmission medium
Bandwidth
The difference between the highest and the lowest frequency
VoIP
The technology used in transfering voice via the Internet Protocol
Baud
Number of distinct signal changes within transmission medium
TDM
Multiplexation that divides stream of data using time frames. A chunk of data that corresponds to given time-frame is sent by the transmission medium
TDMA
Sharing one TDM network between many transmitters
QoS
Description of overall performance of Network, Telephony or Cloud Computing services
MAU
Device which allows you to connect multipe devices in a star topology