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Terminology 33
Media Flow Controller Administrator’s Guide Preface
Relative URL A relative URL points to the location of a file from a point of reference, usually
the directory beneath. Preceded by two dots (../directory_path/file.txt) for the directory above;
one dot (./directory_path/file.txt) for the current directory. Contrast with
Absolute URL .
RTMP Real Time Messaging Protocol. A multimedia streaming and RPC (remote procedure
call) protocol primarily used in Adobe Flash. RTMP has three variations: The “plain” protocol
which works on top of TCP and uses port 1935, RTMPT which is encapsulated within HTTP
requests to traverse firewalls, RTMPS which works just like RTMPT but over a secure HTTPS
connection.
RTP Real-time Transport Protocol. A standardized packet format for delivering audio and
video over the Internet. It is used in conjunction with other protocols such as RTSP. The RTP
standard defines a pair of protocols, RTP and the Real-time Transport Control Protocol
(RTCP). RTP is used for transfer of multimedia data and RTCP is used to periodically send
control information and QoS (quality of service) parameters between the server and client.
RTSP Real Time Streaming Protocol. An application level protocol for the control of real-time
streaming data sent over RTP. Typically RTP data is sent over UDP, but it can also be sent
over the RTSP channel via an interleaved mechanism or over TCP via port 80 with HTTP-like
syntax and operations.
RU (Rack Unit) A unit of measurement of the height of a rack-mounted device.
RX A communications abbreviation for “receive.”
SAS Serial attached SCSI. A data transfer technology designed to move data to and from
computer storage devices such as hard drives and tape drives.
SATA Serial Advanced Technology Attachment. A computer bus technology primarily
designed for transfer of data to and from a hard disk.
SCP The SCP (secure channel protocol) pseudo-URL format is:
scp://<username>[:<password>]@<hostname>/<path>[</filename>]
The path is an absolute path. Paths relative to the user's home directory are not currently
supported. You must have an SCP server installed in order to SCP files to your machine.
SFTP The SFTP (secure file transfer protocol) pseudo-URL format is:
sftp://<username@<hostname>:<path>[</filename>]
The path is an absolute path. Paths relative to the user's home directory are not currently
supported. You must have FTP server installed in order to FTP or SFTP, respectively, files to
your machine. SFTP uses SSH.
SSD Solid-state drive, a storage device using solid-state memory to store persistent data.
Streaming Streaming is the process of playing a file while it is still being downloaded.
Streaming technology lets a user view and hear digitized content as it is being downloaded.
Tunneling When a payload protocol is incompatible with the delivery network, a tunneling
protocol can encapsulate it for delivery only; no polices can be applied.
Unicast A type of network routing scheme where data is sent to a single destination host on a
network. Contrast with
Broadcast , and Multicast .
UOL, URI, URL Uniform Object Locator, Uniform Resource Identifier, Uniform Resource
Locator (respectively). When shown as a command variable, for example <URL>, this
indicates a normal URL, using any protocol that WGET supports, including HTTP, HTTPS,
FTP, and TFTP; or a pseudo-URL specifying an SCP file transfer.