Glossary - Barco Freya User Manual

Glossary

3G-SDI
Serial Digital Interface (SDI) is a serial link standardized by ITU-R BT.656 and the Society of Motion Picture
and Television Engineers (SMPTE). SDI transmits uncompressed digital video over 75-ohm coaxial cable
within studios, and is seen on most professional video infrastructure equipment. The first revision of the
standard, SMPTE 259M, was defined to carry digital representation of analog video such as NTSC and PAL
over a serial interface and is more popularly known as standard-definition (SD) SDI. The data rate required to
transmit SD SDI is 270 Mbps. With the advent of high-definition (HD) video standards such as 1080i and 720p,
the interface was scaled to handle higher data rates of 1.485 Gbps. The 1.485-Gbps serial interface is
commonly called the HD SDI interface and is defined by SMPTE 292M, using the same 75-ohm coaxial cable.
Studios and other video production facilities have invested heavily on the hardware infrastructure for coaxial
cable and have a vested interest in extending the life of their infrastructure. Fortunately, SMPTE recently
ratified a new standard called SMPTE 424M that doubles the SDI data rates to 2.97 Gbps using the same 75-
ohm coaxial cable. This new standard, also called 3-Gbps (3G)-SDI, enables higher resolution of picture
quality required for 1080p and digital cinema.
Default Gateway
A router that serves as an entry point into and exit point out of a network. For example, a local network (LAN)
may need a gateway to connect it to a wide area network (WAN) or to the Internet.
DHCP
Dynamic host configuration protocol. DHCP is a communications protocol that lets network administrators
manage centrally and automate the assignment of IP addresses in an organization's network. Using the
Internet Protocol, each machine that can connect to the Internet needs a unique IP address. When an
organization sets up its computer users with a connection to the Internet, an IP address must be assigned to
each machine. Without DHCP, the IP address must be entered manually at each computer and, if computers
move to another location in another part of the network, a new IP address must be entered. DHCP lets a
network administrator supervise and distribute IP addresses from a central point and automatically sends a
new IP address when a computer is plugged into a different place in the network.
DNS server
Computers, Projectors, Touch panels connected to a network are referenced by their IP address. The only
problem is that remembering IP addresses is not easy. If you need to use hundreds of addresses then it will
become impossible to remember them. This is why domain names are created. Internet names (domain and
host names) are just aliases to these IP addresses. When you use an Internet address it is automatically
translated to an IP address. In fact a program or device that translates those Internet names to IP addresses is
called a DNS Server.
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