User manual

54
AXIS Q7404 - Glossary
network. Quality can be defined as e.g. a maintained level of
bandwidth, low latency, no packet losses, etc.
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 is often included as part of a network switch
(see below).
RTP (Real-Time Transfer Protocol) - A transfer protocol designed
for the delivery of live content, e.g. H.264.
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.
Simplex - In simplex operation, a network cable or
communications channel can only send information in one
direction; it's a “one-way street”.
SMTP (Simple Mail Transfer Protocol) - The protocol used to
send e-mail across the Internet. SMTP authentication is a way of
allowing people outside of a domain to use an SMTP server when
sending e-mail.
SNMP (Simple Network Management Protocol) - An application
layer protocol that facilitates the exchange of management
information between network devices. It is part of the
Transmission Control Protocol/Internet Protocol (TCP/IP) protocol
suite.
Subnet Mask - An IP address consists of two components: the
network address and the host address. “Subnetting’ enables a
network administrator to further divide the host part of the
address into two or more subnets. The subnet mask identifies the
subnet to which an IP address belongs.
Switch - A network switch is a device used to connect multiple
devices to the network. A switch only transmits data to the device
the data is specifically intended for.
TCP/IP (Transmission Control Protocol/Internet Protocol) - A
suite of network protocols that determine how data is
transmitted. TCP/IP is used on many networks, including the
Internet. TCP keeps track of the individual packets of information
and IP contains the rules for how the packets are actually sent
and received.
UDP (User Datagram Protocol) - A communications protocol that
offers a limited amount of service when messages are exchanged
between computers in a network that uses the Internet Protocol
(IP). UDP is an alternative to the Transmission Control Protocol
(TCP) and, together with IP, is also known as UDP/IP.
Unicast - Communication between a single sender and a single
receiver over a network. A new connection is established for each
new user.
URL (Uniform Resource Locator) - An “address" on the network.
Varifocal - A varifocal lens provides a wide range of focal lengths,
as opposed to a lens with a fixed focal length, which only provides
one.
WAN (Wide-Area-Network) - Similar to a LAN, but on a larger
geographical scale.
Web server - A program on a computer that delivers the
resources (usually web pages) requested by the web user (the
client).