www. m oxa. com Industrial Wireless LAN Solutions Industrial Wireless LAN Solutions > Introduction to Industrial Wireless LAN Solutions 6 6-4 Wireless Redundancy Industrial Designs Industrial environments contain many elements that can cause failures in the underlying wireless network. For example, a microwave transmitter that constantly emits radio waves at 2.4 GHz will likely interfere with or interrupt the operation of Wi-Fi radios that are not configured to guard against such interference. Another example is a wireless network in a harbor that is interrupted when a truck unexpectedly blocks the wireless signal’s line-of-sight. Wireless redundancy is essential to ensure continuous wireless transmission for mission-critical applications and to guard against interference from the industrial environment. Network-Level Wireless Redundancy: AeroLink Protection Moxa’s innovative AeroLink Protection technology provides a smart failover method with fast recovery time and scalability, making it easy to enable multiple layers of wireless connection protection to maximize your mission-critical system uptime and keep your entire network alive for continuous transmission. With AeroLink Protection, a network has two or more AeroLink Protection-enabled wireless client nodes connected to a single access point. One serves as the active node, while the others are passive, backup nodes. If the active node stops sending or receiving data for any reason, AeroLink Protection completely restores the communication link within milliseconds by bringing backup nodes online. Furthermore, the passive node can be connected to a different access point on a different frequency, providing frequency-level redundancy. It prevents system downtime from both device failure and frequency interruption offering comprehensive wireless redundancy for your wireless networks. Industrial-grade rugged design is indispensable for mission-critical systems running under harsh conditions. Moxa’s wireless products offer RF isolation, power isolation, wide operating temperature, and high ingress protection to ensure that your wireless connections are stable, even in severe environments. Dual Isolation: Power and RF To simplify installation, the new AWK-A series is designed with integrated dual isolation protection. First, Integrated RF Isolation provides 500 V insulation protection and level 4 ESD protection on all antenna ports, without loss of the RF signal. In addition, Integrated Power Isolation provides 500 V insulation protection and stabilizes system voltage from unstable power inputs. This unique built-in design not only protects your device from environmental damage, it also makes field site installation much easier by reducing the need for additional accessories. DFS Channel Support Wi-Fi frequency channels are strictly limited by regulations. Therefore, using as much of the available bandwidth as possible is the only way to maximize wireless throughput and performance. So channel planning is extremely important in the system integrator’s initial design. As well as using all the normally available frequencies, Moxa’s AWK-A series is certified to operate on DFS (Dynamic Frequency Selection) channels, significantly increasing the total number of available channels. When switching to a new DFS channel, regulations require a 60-second delay to ensure that the channel is clear of radar signals before transmitting. Even so, the ability to use DFS channels greatly improves the overall bandwidth capacity of wireless networks. Designed for Harsh Environments Moxa’s wireless LAN solutions operate in a wide temperature range of -40 to 75°C. Moreover, their IP30 and IP68 ratings provide additional protection in outdoor environments. Dual-Radio Wireless Redundancy Moxa’s concurrent dual-radio transmission technology virtually eliminates the possibility of wireless interference. The concept of concurrent dual-radio technology is simple: for every outbound packet, a duplicate packet is sent simultaneously via the secondary frequency to ensure that at least one of the packets reaches the receiver. Latency- sensitive applications can be deployed across a concurrent dual-radio wireless network because the chance that an unintentional source of interference can simultaneously disrupt both bands (2.4 GHz and 5 GHz) is highly unlikely. In case of any frequency interruptions, unlike traditional solutions, this technology can achieve zero packet loss.