Gatekeeper G4-504HD2a User's Operating Manual page 6

OSD
SD
TCP
UDP
USB
UTC
Glossary
On Screen Display – an image superimposed on a screen commonly
used to display information such as volume, channel, date/time, device
status, etc. It also forms the basis of the menu system display which is
used to configure the system settings of the digital video recorder.
Secure Digital Card – an ultra-small flash memory card designed to
provide high-capacity memory in a small form factor. It is a commonly
used high performance portable storage standard for video and audio
capture devices.
TCP is one of the main protocols in TCP/IP networks which enables
two hosts to establish a connection and exchange streams of data. TCP
guarantees delivery of data and also guarantees that packets will be
delivered in the same order in which they were sent.
UDP is a simple connectionless transmission model with a minimum
overhead of protocol mechanisms.
Universal Serial Bus – it is an industry standard that defines the cables,
connectors and communications protocols used in a bus for
connection, communication, and power supply between computers
and electronic devices.
Coordinated Universal Time is a time standard based on International
Atomic Time with leap seconds added at irregular intervals to
compensate for the Earth's slowing rotation. It is the primary time
standard by which the world regulates clocks and time.
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