T-VIPS CP560, User Manual

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Glossary 165
ID: um_t2gateway CP560 DVB-T2 Gateway User’s Manual Rev. 2.2 (3686)
SNTP
Simple Network Time Protocol is an Internet protocol used to synchronize the system
clocks of computers to a time reference. It is a simplified version of the protocol NTP
protocol which is overcomplicated for many applications.
SPTS
Single Program Transport Stream. MPEG2 Transport Stream that contains a single pro-
gram/service.
TCP
Transmission Control Protocol. A “reliable” protocol above the IP layer that provides
automatic retransmission of datagrams in case of packet loss, making it very robust and
tolerant against network errors. TCP is the fundamental protocol used in the Internet for
WEB traffic (HTTP protocol). TCP is indented for point-to-point pcommunication; TCP
cannot be used for communication from one node to many others.
TCP/IP
A common term used for the Internet protocol suite, i.e. the set of protocols needed for
fundamental IP network access: TCP, IP, UDP, ARP etc.
ToS
Type of Service. This is a field in the header of IP datagrams to provide various service
types. It has now been “taken over” and reused by DiffServ.
Transport Stream (TS)
The common name for an MPEG2 Transport Stream. A bit stream used to carry a multiplex
of packets, each identified by a unique Packet Identifier (PID) defining a logical channel.
A PID stream typically represents a video or an audio service.
UDP
User Datagram Protocol. An “unreliable” protocol above the IP layer that also provides port
multiplexing. UDP allows transmission of IP data packets to several receiving processes
in the same unit/device. UDP is used in multicast applications.
Unicast
Point-to-point connection. In this mode, a transmit node sends e.g. video data direct to a
unique destination address.
VLAN
Virtual Local Area Network, a network of units that behave as if they are connected to the
same wire even though they may be physically located on different segments of a LAN.
Watermarking
A mechanism to “stamp” video content with unique marks, making it possible to trace the
origin of illegaly distributed content. Watermarks are invisible to the viewer.
XML
eXtensible Markup Language. A common self-describing text-based data format. Used
for many purposes: Meta-data, configuration files, documents, etc. The readability of the
format has made it very popular and is now the basis of many types of WEB services.