Page 49
HDR-1000 User and Technical Manual
Term
Defi nition
BNC
Bayonet lock coaxial connector. Compare to TNC.
COFDM
Coded Orthogonal Frequency Division Multiplexing
A digital multi-carrier modulation scheme that utilizes numerous closely-
spaced orthogonal sub-carriers.
Composite (Baseband)
A band or grouping of frequencies and/or subcarriers, including video,
occupied by the signal in a radio transmission system. Also called Baseband.
dB
Decibel
A logarithmic measurement of power or voltage, applied to audio and RF
signals.
dBm
A measure of RF signal strength defi ned as “decibels relative to one milliwatt
(mW).” A 1 mW signal has a signal strength of 0 dBm. A signal weaker than
1 mW has a negative dBm value, and a signal stronger than 1 mW has a
positive dBm value.
DES
Data Encryption Standard
DHCP
Dynamic Host Confi guration Protocol
A protocol for automating the confi guration of computers that use TCP/IP.
DNS
Domain Name Server/Service
DVB-T
Digital Video Broadcasting - Terrestrial
FEC
Forward Error Correction
A type of digital signal processing in which a transmitter encodes redundant
data bits in a signal and a decoder in a receiver detects any errors and
extracts the original signal.
FTP
File Transfer Protocol
A standard Internet protocol commonly used to transfer fi les from the local
computer to a remote web server or to download fi les from a remote server to
the local computer.
Guard Interval
A method used to prevent interference among distinct transmissions.
GOP
Group of Pictures
In MPEG encoding, a group of pictures specifi es the order in which intra-
frames are arranged. The GOP is a group of successive pictures within an
MPEG-coded fi lm and/or video stream. Each MPEG-coded fi lm and/or video
stream consists of successive groups of pictures.
HD
High Defi nition (video)
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