Wireless Redundancy Technology

Radio interference is always a major concern for wireless applications. In fact, the real world presents many factors that result in less-than-perfect wireless performance, such as mismatched impedance, electronic noise, building obstructions, and reflected signals. In a wireless environment, data transmission is over the air, and due to the characteristics of this medium, wireless communication calls for a very different type of technical knowledge to ensure that your entire wireless network is more reliable.


The most widely adopted wireless standards are 802.11a, 802.11b, and 802.11g. 802.11a operates at a frequency of 5 GHz, and supports higher data transfer rates. 802.11b provides a greater coverage area than 802.11a, but at significantly lower data rates. 802.11g, which is the newest of the three standards, combines the best features of 802.11a and 802.11b. 802.11g, and operates at a frequency of 2.4 GHz and supports data rates up to 54 Mbps.
Radio interference normally occurs at specific frequencies. For example, 802.11g, which operates at 2.4 GHz, is the most popular of the main WLAN standards and consequently it is subject to frequent radio interference.
Below we compare what happens when interference occurs at the 2.4 GHz frequency when using the traditional wireless architecture (single RF) and Moxa's dual-RF environment.




   Traditional Wireless Architecture
In traditional architectures, most vendors only provide a single RF AP and Client, in which the AP connects one or more Clients to the network. Since the AP and Client are connected by a single RF connection at a frequency of 2.4 GHz, if the interference occurs at 2.4 GHz then the RF connection will be disconnected, and the network behind the Client will be disconnected, too.
   Moxa's Dual-RF Wireless Redundancy Typology
Using two or more frequencies at the same time to transmit data will allow transmission to continue even if interference occurs on one of the frequencies. Moxa's IEEE 802.11 a/b/g-compliant AWK-5222 is equipped with the newest proprietary wireless redundancy technology, which has two independent RF modules, and allows you to set up independent wireless connections to avoid interruptions in transmission. Moxa's Dual-RF wireless redundancy typology provides flexible frequency configuration and superior reliability. The two RFs operate at 2.4 GHz; or one operates at 2.4 GHz and the other at 5 GHz, ensuring double reliability for your wireless application.
For reliability beyond wireless redundancy, Ethernet redundancy is also very important. Moxa's AWK-5222 has two Ethernet ports, and supports RSTP (Rapid Spanning Tree Protocol) and Turbo Ring for the Ethernet side of the connection.
As shown in the figure below, Moxa's unique wireless/Ethernet redundancy for rapid failover not only ensures the reliability of the entire wireless network, but also helps you establish the most robust wireless connection for critical industrial wireless applications.


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