Axis M1054 User Manual page 58

video bridges as well as multicast-to-unicast translators.
RTCP offers quality-of-service feedback from receivers to
the multicast group as well as support for the
synchronization of different media streams.
RTP (Real-Time Transport Protocol) - RTP is an Internet
protocol for the transport of real-time data, e.g. audio and
video. It can be used for media-on-demand as well as
interactive services such as Internet telephony.
RTSP (Real Time Streaming Protocol) - RTSP is a control
protocol, and a starting point for negotiating transports
such as RTP, multicast and Unicast, and for negotiating
codecs.
RTSP can be considered a 'remote control' for controlling
the media stream delivered by a media server. RTSP servers
typically use RTP as the protocol for the actual transport of
audio/video data.
Router - A device that determines the next network point
to which a packet should be forwarded on its way to its
final destination. A router creates and/or maintains a
special routing table that stores information on how best to
reach certain destinations. A router is sometimes included
as part of a network switch. See also switch.
Server - In general, a server is a computer program that
provides services to other computer programs in the same
or other computers. A computer running a server program
is also frequently referred to as a server. In practice, the
server may contain any number of server and client
programs. A web server is the computer program that
supplies the requested HTML pages or files to the client
(browser).
Sharpness - This is the control of fine detail within a
picture. This feature was originally introduced into color
TV sets that used notch filter decoders. This filter took
away all high frequency detail in the black and white
region of the picture. The sharpness control attempted to
put some of that detail back in the picture. Sharpness
controls are mostly superfluous in today's high-end TVs.
The only logical requirement for it nowadays is on a VHS
machine.
Simplex - In Simplex operation, a network cable or
communications channel can only send information in one
direction.
SMTP (Simple Mail Transfer Protocol) - SMTP is used for
sending and receiving e-mail. However, as it is 'simple,' it
is limited in its ability to queue messages at the receiving
end, and is usually used with one of two other protocols,
POP3 or IMAP. These other protocols allow the user to save
messages in a server mailbox and download them
periodically from the server.
SMTP authentication is an extension of SMTP, whereby
the client is required to log into the mail server before or
during the sending of email. It can be used to allow
legitimate users to send email while denying the service to
unauthorized users, such as spammers.
SNMP (Simple Network Management Protocol) - SNMP
forms part of the Internet Protocol suite, as defined by the
Internet Engineering Task Force. The protocol can support
AXIS M10 Series - Glossary of Terms
monitoring of network-attached devices for any conditions
that warrant administrative attention.
Sockets - Sockets are a method for communication
between a client program and a server program over a
network. A socket is defined as 'the endpoint in a
connection.' Sockets are created and used with a set of
programming requests or 'function calls' sometimes called
the sockets application programming interface (API).
SSL/TSL (Secure Socket Layer/Transport Layer Security)
These two protocols (SSL is succeeded by TSL) are
cryptographic protocols that provide secure
communication on a network. SSL is commonly used over
HTTP to form HTTPS, as used e.g. on the Internet for
electronic financial transactions. SSL uses public key
certificates to verify the identity of the server.
Subnet/subnet mask - A subnet is an identifiably separate
part of an organization's network. Typically, a subnet may
represent all the machines at one geographic location, in
one building, or on the same local area network (LAN).
Having an organization's network divided into subnets
allows it to be connected to the Internet with a single
shared network address.
The subnet mask is the part of the IP address that tells a
network router how to find the subnet that the data packet
should be delivered to. Using a subnet mask saves the
router having to handle the entire 32-bit IP address; it
simply looks at the bits selected by the mask.
Switch - A switch is a network device that connects
network segments together, and which selects a path for
sending a unit of data to its next destination. In general, a
switch is a simpler and faster mechanism than a router,
which requires knowledge about the network and how to
determine the route. Some switches include the router
function. See also Router.
TCP (Transmission Control Protocol) - TCP is used along
with the Internet Protocol (IP) to transmit data as packets
between computers over the network. While IP takes care
of the actual packet delivery, TCP keeps track of the
individual packets that the communication (e.g. requested
a web page file) is divided into, and, when all packets have
arrived at their destination, it reassembles them to re-form
the complete file.
TCP is a connection-oriented protocol, which means that a
connection is established between the two end-points and
is maintained until the data has been successfully
exchanged between the communicating applications.
Telnet - Telnet is a simple method with which to access
another network device, e.g. a computer. The HTTP
protocol and the FTP protocols allow you to request
specific files from remote computers, but do not allow you
logon as a user of that computer. With Telnet, you log on
as a regular user with whatever privileges you may have
been granted for specific applications and data residing on
that computer.
UDP (User Datagram Protocol) - UDP is a communications
protocol that offers limited service for exchanging data in
a network that uses the Internet Protocol (IP). UDP is an
alternative to the Transmission Control Protocol (TCP). The
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