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AXIS COMMUNICATIONS
<Product Name> Quick User’s Guide
62
Ping - A small utility used for sending data packets to
network resources to check that they are working and that
the network is intact.
Pre/post alarm image - The
images from immediately
before and after an alarm.
Privacy mask -
An image or specified area used to block
out certain parts of the video image.
Protocol - A
special set of rules governing how two entities
will communicate. Protocols are found at many levels of
communication, and there are hardware protocols and
software protocols.
Router - A dev
ice 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 - Rea
l-Time Transfer Protocol. A transfer protocol
designed for delivery of live contents, e.g. MPEG-4.
Simplex - In simplex ope
ration, a network cable or
communications channel can only send information in one
direction.
SMTP -
Simple Mail Transfer Protocol. A protocol used for
e-mail transmissions over the Internet.
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 add
ress 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 - Whilst a
simple hub transmits all data to all
devices connected to it, a switch only transmits the data to
the device it 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 - The
User Datagram Protocol is 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 - Com
munication that takes place over a network
between a single sender and a single receiver.
UPnP
TM
- Allows the automatic peer-to-peer detection of
devices on the network.
URL
- Uniform Resource Locator. An “address" on the network.
Varifocal - A varifo
cal 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 (serve
r) providing the
resources (e.g. web pages) requested by the user (client).