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Chap.4 IP Network
4.5 Wireless Networks
Wireless technologies include WiFi, WiMAX and 3GPP. WiFi is used for short-distance transmission while WiMAX
for long distance.
4.5.1 WiFi
IEEE 802.11, developed by the IEEE LAN/MAN Standards Committee, is a set of standards for wireless local area
network computer communication. 802.11b, 802.11g, and 802.11n are widely used in wireless network devices.
802.11b
802.11b operates in the 2.4GHz band with a transfer rate of 11Mbps and a range of 35 meters indoors and 100
meters outdoors. The drawback of 802.11b is that signals can be blocked by walls. The 2.4GHz is also subject to
interference caused by electronics or Bluetooth signals.
802.11g
802.11g, the same as 802.11b, operates in the 2.4GHz band. It has a transfer rate of 54Mbps, similar to that
of 802.11a, and a range of 25 meters indoors and 75 meters outdoors. 802.11g has the same weaknesses as
802.11b; however, it outperforms 802.11b in transfer rate.
802.11n
802.11n is a wireless standard certified in 2008. Based on MIMO (Multi-input Multi-output), 802.11n boasts an
amazing transfer rate of 600Mbps and a range of 50 meters indoors and 300 meters outdoors. It can operate in
the 2.4GHz or 5GHz band and is ideal for applications demanding high bandwidth such as high-definition video
streaming.
4.5.2 3GPP
3GPP is a set of open standard protocols for audio and video bitstreams to be viewed on a 3G mobile phone (Figure
4.7). This standard is widely supported by major mobile phone vendors.
All of VIVOTEK's 7000-series or above network cameras provide 3GPP support, allowing users to access video
images at any time and anywhere via a 3G mobile phone.
Home
Internet
3G-324M
Multimedia
Gateway
3G Cell Phone
Office
Figure 4.7 Mobile surveillance via 3GPP
4.5.3 WiMAX
WiMAX is a wireless broadband technology featuring long-distance transmission capability. It is an alternative to
cable networks such as ADSL in remote areas where network infrastructure is incomplete.
WiMAX, developed by the 802.16 group of IEEE, is also called the 802.16 standard. WiMAX offers a transfer rate
of 70Mbps in a range of 70 kilometers, making it ideal for long-distance and outdoor connection. Compared with
802.11X standards, WiMAX provides wider coverage, a higher transfer rate, a larger transmission volume and
higher QoS.
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