164 Glossary
CP560 DVB-T2 Gateway User’s Manual Rev. 2.2 (3686) ID: um_t2gateway
RTP
Real-time Transfer Protocol. A protocol designed for transmission of real-time data like
video and audio over IP networks.
SD-SDI
Standard Definition Serial Digital Interface. Also known as ANSI/SMPTE 259M-1997 or
ITU-R BT.656. A specification describing how to digitize and transmit uncompressed stan-
dard definition video signals. The typical bit rate of an SD-SDI signal is 270Mbit/s.
SDI
Serial Digital Interface. Used to describe both HD-SDI and SD-SDI input and output ports.
SDP
Session Description Protocol. A protocol describing multimedia communication sessions
for the purposes of session announcement, session invitation, and parameter negotiation.
SDP is typically used to describe an ongoing multicast; for example the type of compression
used, IP addresses etc.
SDTI
Serial Data Transport Interface. A mechanism that allows transmission of various types of
data over an SDI signal. This may be one or more compressed video signals or other pro-
prietary data types. The advantage of SDTI is that existing SDI transmission infrastructure
can be used to transport other types of data.
SDTV
Standard Definition Television. The normal television standard/resolution in use today.
SFP
Small Form-factor Pluggable module. A standardized mechanism to allow usage of various
electrical or optical interfaces to provide Gigabit Ethernet. Several types of SFP modules
exist: Single mode fiber modules for long-distance transmission and multi mode fiber
modules for shorter distances. SFP is also known as “mini-GBIC”.
SIP
Session Initiation Protocol. The Session Initiation Protocol (SIP) is an IETF-defined signaling
protocol, used for controlling multimedia communication sessions such as voice and video
calls over IP. The protocol can be used to create, modify and terminate unicast or multicast
sessions consisting of one or several media streams.
SNDU
Sub Network Data Unit. Protocol Data Units (PDUs), such as Ethernet Frames, IP data-
grams, or other network-layer packets used for transmission over an MPEG-2 Transport
Multiplex, are passed to an Encapsulator. This formats each PDU into an SNDU by adding
an encapsulation header and an integrity check trailer. The SNDUs are fragmented into
one or a series of MPEG-2 Transport Stream (TS) packets and sent over a single TS logical
channel.
SNMP
Simple Network Management Protocol. A fundamental and simple protocol for manage-
ment of network elements. Commonly used by Network Management Systems and other
applications.
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