Axis 262+ Manual do Utilizador descarregar pdf (Página 34)

TECHNICAL CORNER

TECHNICAL CORNER / Video streaming, Power over Ethernet, Quality of Service34

VIDEO STREAMING

Many Axis network video products oer users the

option of more than one video compression format.

The video compression standards include Motion JPEG,

MPEG-4 Part 2 and H.264 (also known as MPEG-4 Part

10/AVC). H.264 is the latest compression standard that

oers the most ecient format for compressing video,

enabling great savings in bandwidth and storage with-

out compromising image quality.

The Axis Media Control (AMC) includes both an MPEG-4

and an H.264 decoder, which make viewing video

streams and integration into applications easy.

Furthermore, Axis’ multicasting support enables an un-

limited number of viewers without sacricing network

system performance.

POWER OVER ETHERNET (PoE)

One cable for transmitting video, audio* and power. With

a network video solution, you have the option of using

the same Ethernet cable both for data communications

and power. This feature makes it easier to install products

since an electrician is not required and the network

video product is able to operate even when there is a

power failure if the PoE source is connected to a UPS.

*depending on camera model

PoE technology is regulated in a standard called IEEE

802.3af and is designed in a way that does not degrade

the network data communication performance or

decrease the network reach. The power delivered over

the LAN infrastructure is automatically activated when

a compatible terminal is identied, and blocked to

legacy devices that are not compatible. This feature

allows users to freely and safely mix legacy and PoE-

compatible devices on their network.

QUALITY OF SERVICE (QoS)

As dierent networks, such as telephone, data and

video (CCTV) all continue to merge into a single IP

network, it becomes more and more important to

control the sharing of network resources, to fulll the

requirements of each service.

One solution is to have network equipment treat

dierent types of services (voice, data, video) dier-

ently as the trac passes through the network.

By using Quality of Service (QoS), network applications

can co-exist on the same network, without consuming

each other’s bandwidth. QoS makes it possible to

prioritize trac, thus creating a more reliable network.

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