1129| Glossary of Terms AOS-W 6.5.3.x| User Guide
DPI
Deep Packet Inspection. DPI is an advanced method of network packet filtering that is used for inspecting data
packets exchanged between the devices and systems over a network. DPI functions at the Application layer of
the Open Systems Interconnection (OSI) reference model and enables users to identify, categorize, track,
reroute, or stop packets passing through a network.
DRT
Downloadable Regulatory Table. The DRT feature allows new regulatory approvals to be distributed for APs
without a software upgrade or patch.
DS
Differentiated Services. The DS specification aims to provide uninterrupted quality of service by managing
and controlling the network traffic, so that certain types of traffic get precedence.
DSCP
Differentiated Services Code Point. DSCP is a 6-bit packet header value used for traffic classification and
priority assignment.
DSL
Digital Subscriber Line. The DSL technology allows the transmission of digital data over telephone lines. A DSL
modem is a device used for connecting a computer or router to a telephone line that offers connectivity to the
Internet.
DSSS
Direct-Sequence Spread Spectrum. DSSS is a modulation technique used for reducing overall signal
interference. This technique multiplies the original data signal with a pseudo random noise spreading code.
Spreading of this signal makes the resulting wideband channel more noisy, thereby increasing the resistance
to interference. See FHSS.
DST
Daylight Saving Time. DST is also known as summer time that refers to the practice of advancing clocks, so
that evenings have more daylight and mornings have less. Typically clocks are adjusted forward one hour
near the start of spring and are adjusted backward in autumn.
DTE
Data Terminal Equipment. DTE refers to a device that converts user information into signals or re-converts
the received signals.
DTIM
Delivery Traffic Indication Message. DTIM is a kind of traffic indication map. A DTIM interval determines when
the APs must deliver broadcast and multicast frames to their associated clients in power save mode.
DTLS
Datagram Transport Layer Security. DTLS communications protocol provides communications security for
datagram protocols.
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