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NewS
tream
User Guide and Technical Manual
Term
Defi nition
Decoder Buffer Length
The Decoder Buffer Length is the size of the buffer fed to the decoder when
using an audio bitrate_cap, expressed in kbps. The buffer_size divided by
bitrate_cap represents the size of the buffer in milliseconds; so if you set bitrate_
cap to 1000 and buffer_size to 1000, the buffer is effectively 1.0 second. If
bitrate_cap is 500 and buffer_size is 1000, the buffer is 2.0 seconds. This factor
is typically used only for streaming [RTMP or broadcast] video, not for HTTP
delivery of video. Only use this setting if you understand its implications, as it can
decrease video quality. This should typically only be used for streaming [or for
device playback].
DES
Data Encryption Standard
DHCP
Dynamic Host Con
fi
guration Protocol
A protocol for automating the con
fi
guration of computers that use TCP/IP.
Dynamic Host Con
fi
guration Protocol is a network protocol used to con
fi
gure
network devices to communicate on an IP network.
Internet Protocol addresses are assigned to a host either at the time of booting,
or permanently, by
fi
xed con
fi
guration of its hardware or software. Persistent
con
fi
guration is also known as using a Static IP address. In contrast, in situations
when the computer’s IP address is assigned newly each time, this is known as
using a dynamic IP address.
Dynamic Host Con
fi
guration Protocol is a network protocol used to con
fi
gure
network devices to communicate on an IP network. A DHCP client uses DHCP
protocol to acquire con
fi
guration information, such as an IP address, a default
route and one or more DNS server addresses from a DHCP server. The DHCP
client then uses this information to con
fi
gure its host. Once the con
fi
guration
process is complete, the host is able to communicate on the Internet.
DNS
Domain Name System
A DNS Server hosts a network service for providing responses to queries against
a directory service. It maps a human-recognizable identi
fi
er to a system-internal,
numeric, identi
fi
cation or addressing component. This service is performed
by the server according to a network service protocol. The most important
function of the DNS Server is the translation or resolution of human-memorable
domain names and hostnames into the corresponding numeric Internet Protocol
Addresses.
DVB-T
Digital Video Broadcasting - Terrestrial
This system transmits compressed digital audio, digital video and other data
in an MPEG transport stream, using coded orthogonal frequency-division
multiplexing [COFDM or OFDM] modulation. DVB-T offers three different
modulation schemes: QPSK, 16QAM and 64QAM.
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.
