Network Technologies DVB-ASI to IP - Manual (Page 76)

ASI-IP-GTW User's Manual
Page 76
7 Appendix A: Glossary
1000Base-T: The term for the Electrical Gigabit Ethernet interface. This
is the most common interface for Gigabit Ethernet. Most Gigabit-
enabled PCs and equipment use this interface.
ARP: Address Resolution Protocol. A protocol used to "resolve" IP
addresses into underlying Ethernet MAC addresses.
ATSC: Advanced Television Systems Committee. An American
organisation working with standardisation of digital television
broadcasts, primarily in the US but also in Asia and other parts of the
world.
DiffServ: Differentiated Services. A mechanism used on layer 3 - e.g.
the IP layer - to differentiate between traffic of various types. DiffServ is
based on the ToS field and provides a mechanism for the network to
give e.g. video traffic higher priority than other traffic (for example
Internet traffic).
DVB: Digital Video Broadcasting. The European consortium defining
standards for transmission of digital TV broadcasts, primarily in
Europe.
DVB ASI: Digital Video Broadcasting Asynchronous Serial Interface. A
common physical interface for transmission of MPEG2 Transport
Streams (i.e. MPEG2-compressed video) over a serial interface, typically
coaxial cables.
DWDM: Dense Wavelength Division Multiplexing. A mechanism to
utilize existing fiber with even more bandwidth by adding extra signals
using other wavelengths/colors.
Ethernet: Originally a 10Mbit/s shared medium network type
developed by Xerox. Later transformed into an official standard.
Nowadays, most Ethernet networks are based on full duplex
connections over twisted pair cables. Ethernet switches in the network
take care of routing Ethernet frames between nodes. The speeds now
supported are 10Mbit/s, 100Mbit/s and 1000Mbit/s. 10Gigabit/s
Ethernet networks are now emerging.
FEC: Forward Error Correction. A mechanism to add extra data to a
transmission in order to protect it. Dependent on the amount of extra
data added, the receiver will be able to correct errors (i.e. regenerate
lost packets) in case of network packet loss.
HDTV: High Definition Television. The new, coming television
standard(s) that gives clearer and more detailed TV pictures. Many TV
sets sold today (especially flat-screen TVs) are prepared for high
definition TV.
HTTP: HyperText Transfer Protocol. The fundamental protocol used on
the Internet for transmission of WEB pages and other data between
servers and PCs.
ICMP: Internet Control Message Protocol. ICMP messages, delivered in
IP packets, are used for out-of-band messages related to network
operation or mis-operation.
IGMP: Internet Group Management Protocol. IGMP is a protocol used to
manage multicasts on the Internet. For a host (receiver unit) to receive
a multicast, it needs to transmit IGMP "join" messages on the right