Manual Axis 207 network camera 10 pack (page 50 of 54) (English)

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AXIS 207 - Glossary of Terms

proxy server acts as an intermediary between a workstation

user and the Internet. This provides security, administrative

control, and a caching service. Any proxy server associated

with a gateway server, or part of a gateway server,

effectively separates the organisation’s network from the

outside network and the local firewall. It is the firewall

server that protects the network against outside intrusion.

A proxy server receives requests for Internet services (such

as web page requests) from many users. If the proxy server

is also a cache server, it looks in its local cache of

previously downloaded web pages. If it finds the page, it is

returned to the user without forwarding the request to the

Internet. If the page is not in the cache, the proxy server,

acting as a client on behalf of the user, uses one of its own

IP addresses to request the page from another server over

the Internet. When the requested page is returned, the proxy

server forwards it to the user that originally requested it.

P-VOP - See VOP.

Resolution - Image resolution is a measure of how much

detail a digital image can hold: the greater the resolution,

the greater the level of detail. Resolution can be specified as

the number of pixel-columns (width) by the number of

pixel-rows (height), e.g. 320x240.

Alternatively, the total number of pixels (usually in

megapixels) in the image can be used. In analog systems it

is also common to use other format designations, such as

CIF, QCIF, 4CIF, etc.

RTCP (Real-Time Control Protocol) - RTCP provides

support for real-time conferencing of groups of any size

within an intranet. This 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 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

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

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Axis 207 network camera 10 pack Manual

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