Standards for Technology in Automotive Retail
The General recommendation is the industry standard wireless LAN 802.11g for new installations, which uses unlicensed radio frequencies in the 2.4GHz band without requiring line of sight for most installations and offers the highest speed and greatest distance combination. Please refer to Wireless Recommendations for important information, requirements and recommendations on incorporating security to any wireless network.
Use 802.11n only when:
The business desires higher speeds and range and is comfortable with less mature technology.
Use 802.11a only when:
There is significant RF interference present in the 2.4 GHz bandwidth and the 802.11g wireless network is not feasible.
Use 802.11g when:
You wish to implement a new wireless network or there is already an 802.11b wireless network in place and backward compatibility MUST be maintained.
A qualified supplier should be able to provide assistance in making an accurate estimate of business needs. It is recommended that credentials, certifications and references be obtained.
Site Survey and Planning (Typically performed by wireless vendor)
Check for interference caused by existing wireless LANs, Bluetooth devices, telephone systems, etc. This interference will degrade performance and in some instances may stop LAN or telephone activity.
Ensure the site survey is performed by a wireless integrator or similar vendor using a radiation pattern detection device.
Identify areas to be avoided with other electromagnetic interference (EMI) devices or arc welders.
When using a wireless ISP connection, make sure that does not interfere with the wireless LAN or vice versa.
Wireless networks should be on a separate Ethernet segment to provide broadcast isolation from rest of the network to optimize performance.
Each access point needs to be powered. Utilization of power over Ethernet is recommended. See the glossary for more information.
Devices should be easily upgradeable.
Verify performance (bandwidth, retransmissions, etc.) after installation and obtain a hard copy report.
Wireless technology is a shared media (unlike a switched Ethernet) and as devices are added to each access point, the bandwidth per device will decrease.
The OEMs recommend access points and Network Interface Cards (NICs) that are detailed in the Wireless LAN Security section.
Hardware based encryption provides performance advantages.
Password authentication should be used to increase security.
The OEMs do not recommend the use of wireless LANs with applications that require large file transfers (e.g. Server backups, or Large Image files). Use in areas with other EMI devices or arc welders should be avoided.