Bedienungsanleitung Axis IP-Surveillance system (Seite 22 von 50) (Englisch)

460819

Zoom out

Zoom in

Vorherige Seite

1/50

Nächste Seite

Wireless networks

When running a cable between a LAN and a network camera is impractical, difficult or expensive, a

wireless solution using a wireless access point—also called a device bridge or wireless router—is a good

option. Wireless technology can be useful, for example, in historic buildings where the installation of

cables would damage the interior; within facilities where there is a need to move cameras to new loca-

tions on a regular basis, such as in a supermarket; or in outdoor installations. Wireless technology can

also be used to bridge sites without expensive ground cabling.

Figure 2.3.b. A network with wired and wireless connections.

Security in wireless networks

Securing a wireless network should be addressed. Otherwise, everyone with a wireless device present

within the area covered by the network will be able to participate in the network and use shared ser-

vices. The most commonly used standard today is WEP (Wireless Equivalent Privacy), which adds RSA

RC4-based encryption to the communication, and prevents people without the correct key from access-

ing the network. But as the key itself is not encrypted, it is possible to ‘pick the lock,’ so this should be

seen only as a basic level of security. A new standard, the WPA (WiFi Protected Access), significantly

increases security by taking care of some of the shortcomings in the WEP standard with, for instance,

the addition of an encrypted key.

When using wireless cameras for surveillance, there are a few rules of thumb:

> Enable the user/password login in the cameras

> Enable the encryption in the wireless router/cameras

> Since wireless routers do not have the same bandwidth capacity as a normal switch, no more than

four to five cameras should be connected to a wireless access point.

Hardware (storage needs)

Similar to the way a PC can “save” documents and other files, video can be stored on a server or PC hard

disk. Specialized equipment is not needed since a storage solution treats video data like any other large

group of files that can be stored, accessed and eventually deleted. Video storage, however, puts new

strains on storage hardware because it may be required to operate on a continual basis, as opposed to

during normal business hours with other types of files. In addition, video by nature generates very large

amounts of data, creating high demands on the storage solution.

Calculating the storage needs

In order to appropriately calculate the storage requirements of a network surveillance system, there are

a number of elements to factor in, such as the number of cameras required in your installation, the num-

ber of hours a day each camera will be recording, how long the data will be stored, and whether the

system uses event triggers such as video motion detection or continuous recording. Additional param-

eters such as frame rate, compression, image quality and scene complexity (little motion or lots of mo-

tion) should also be considered.

Wireless device

point

Axis network

camera

Axis network

camera

Wireless access

point

Axis network

camera

Server

Network switch

PC client

2.4.

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Axis IP-Surveillance system Seite 22

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info