Bedienungsanleitung Axis IP-Surveillance system (Seite 17 von 50) (Englisch)

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> Alarm and event management: With this capability, event triggers can be programmed based on

schedule, I/Os, video motion detection, audio detection, active tampering alarm or temperature,

among others. Pre- and post-alarm image buffers within a network camera can save and send

images collected before and after an alarm occurs. Once an alarm or event is detected, a network

camera can send notifications via e-mail, TCP, HTTP and upload images via e-mail, FTP and HTTP.

Note that image uploads consist of sending individual JPEG files and do not mean recordings of

video streams. Recording a video stream on an alarm trigger can be done using a video manage-

ment software program, which has the capability to request a stream based on specific criteria

(e.g., an H.264, MPEG-4 or Motion JPEG compression format, higher frame rate and image quality)

that may be different from normal recording settings.

> Power over Ethernet (PoE) (IEEE 802.3af): When a network camera supports this feature, it

means that the camera can receive power through the same cable as for data. It reduces cabling

requirements and installation costs.

> Wireless: A network camera with built-in wireless support is a consideration when running a cable

between a LAN and a network camera is impractical, difficult or expensive. Wireless network

cameras are suitable for use in outdoor situations, in environments such as historic buildings where

the installation of cables would damage the interior, or in cases where there is a need to move

cameras to new locations on a regular basis, such as in a supermarket. Ensure that the wireless

network camera supports security protocols such as IEEE 802.1X and WPA/WPA2 (Wi-Fi Protected

Access), which will help secure the wireless communication.

> Security and management: At a basic level, a video surveillance network camera should provide

different levels of password-protected access to a network camera. For instance, some authorized

users may only have access to view images from specific cameras; others have operator-level access,

and a few have access to administer all settings in a network camera. Beyond multi-level password

protection, a network camera may offer HTTPS encryption for secure communication; IP address

filtering, which gives or denies access rights to defined IP addresses; IEEE 802.1X to control network

access; and user access log.

> Network management features: They include support for Quality of Service (QoS), which can

prioritize and reserve network capacity for mission-critical surveillance in a QoS aware network,

and support for Internet Protocol version 6 (IPv6) in addition to IPv4 addresses.

c) How to select a network camera:

To determine the type of network cameras required, as well as the number of cameras needed to

adequately cover an area, you first need to determine the scene or environment and the goal of the

surveillance application.

Consider:

1) Environment: This will determine whether you need an outdoor or indoor camera, whether the

camera needs to be tamper or vandal proof, and whether special housing is required. Consider also

the lighting requirements: Is there adequate light to obtain a good quality image? Do you need to

add light sources? How light sensitive should the camera be?

Figure 2.1.r. Overview Figure 2.1.s. Close-up

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