50
AXIS 214 PTZ
the user that originally requested i
P-VOP - See VOP .
Resolution - Image resolutio
d
igital image can hold: the greater the resolution, the greater the level
of detail. Resolution can be sp
(width) by the number of pixel-rows (height), e.g. 320x240.
Alternatively, the total number of pixels (usually in mega
pixels) in
the image can be used. In analog systems it is also common to use
other format designations, such a
RTCP (Real-Time Control Protocol) - RTCP provides support for
re
al-time conferencing of any size within an
support includes source identification and support for gateways like
audio and video bridges as well as multicast-to-unicast translators.
RTCP offers quality-of-service feedba
ck 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 rea
l-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,
a
nd a starting point for negotiating transports such as RTP, multicast
and Unicast, and for ne
RTSP can be c
strea
m delivered by a media server. RTSP se
the protocol for the ac
Router - A device that determines the next network point to which a
p
acket should be forwarded on its way to its final destination. A
router creates and/or mai
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
se
rvices to other computer programs in the same or other computers.
A computer running a server program is also freq
a server. In practice, the server may
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
feature was origina
lly 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 no
Simplex - In simplex operation, a network c
c
hannel can only send information in one direction.
SMTP (Simple Mail Transfer Protocol)SMTP is used for sending
a
nd receiving e-mail. However,
ability to queue messages at the receiving end, and is usually used
with one of two
allow the user to save messages in a server mailbox and download
them periodically from the
SMTP authentication is an extension of SMTP, whereby the client is
re
quired 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, suc
SNMP (Simple Nenagement Protocol)
- SNMP forms part
of the Internet Protocol suite, as defined by the IETF (Internet
Engineering Task Force). The protocol can support monitoring of
network-attached devices for any conditions that warrant
administrative attention.
Sockets - Sockets are a method for communication between a client
p
rogram and a server program over a netw
"the endpoint in a connection." Sockets are created and used with a
set of programming requests or "fun
sockets application programming
SSL/TSL (Secure Socket Layer/TransThese
two protoco
ls (SSL is succeeded by TSL) are cryptographic proto
that provide secure communication on a network. SSL is commonly
used over HTTP to
electronic financial transactio
verify the identity of the
Subnet & subnet mask - A subnet is an identifiably separate part of
an organiza
tion'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). Hav
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
ro
uter how to fin
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 netw
s
egments 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. SeRouter.
TCP (Transmission Control Protocol) - TCP is used along with the
Inte
rnet 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
conne
ction is established betwe
maintained until the data has been successfully exchanged between
the communicating applica
Telnet - Telnet is a simple method with which to access another
netwo
rk 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.
TVL (TV Lines) - A met
UDP (User Datagram Protocol) - UDP is a communications protocol
tha
t 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 advan
to deliver all data and may drop network packets when there is e.g.
network congestion. This is suitable for live video, as there is no point
in re-transmitting old information that
Unicast - Communication between a single sender and a single
recei
ver over a network. A new connection is established for each
new user.
UPnP
TM
- A set of computer network protocols that allows the
automatic peer-to-peer detection of devices on the network. UPnP is
promoted by the UPnP Forum.
URL (Uniform Resource Locator) - An "ad
USB - (Universal Serial Bus) A plug-and-play interface between a
computer and perip
heral devices, e.g. scanners, printers, etc.
Varifocal lens - A varifocal lens provides
lengths, a
s opposed to a lens with
provides one.
VPN (Virtual Private NetworkThis creates a secure "tunnel"
betwe
en the points within the VPN. Only devices with the correct
"key" will be able to work wi
within a company LAN (Local
also be connected over the Internet in a sec
for VPN is for connecting a remote computer to the corporate
network, via e.g. a direct phone line or via the Internet.
