A P P E N D I X H

Load-Dump Protection for Transportation

Vehicles

This appendix describes load-dump protection that is required for autonomous access point/bridge (model: AIR-BR1310G) operation in some transportation vehicles.

Load-Dump Protection

The autonomous access point/bridge can be installed in vehicles such as automobiles, trucks, and buses. Electronic equipment in vehicle environments can be subjected to high-energy voltage transients where the vehicle battery is accidentally disconnected from the alternator charging circuit. In the Society of Automotive Engineers (SAE) standards SAE J1455 and SAE J1211, this voltage transient is referred to as a load-dump transient, where the loading of the battery is dumped or removed from the alternator charging circuits. The access point/bridge does not contain built-in load-dump protection.

Note The power injector LR2T must be used in vehicles providing DC power to the power injector.

Some vehicles contain centralized electronics that are designed to suppress the load-dump transient and prevent equipment damage. To protect the bridge in vehicles without built-in load-dump suppression, you must install an external load-dump protection device, such as the IFM-efector EC2015 for nominal 12-VDC operation or the EC2016 for nominal 24-VDC operation. For additional information refer to the following URLs:

http://www.ifmefector.com/ifmus/web/dsfs!EC2015.html

http://www.ifmefector.com/ifmus/web/dsfs!EC2016.html

Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030

Warning A readily accessible two-poled disconnect device must be incorporated in the fixed wiring. Statement 1022

Cisco Aironet 1300 Series Wireless Outdoor Access Point/Bridge Hardware Installation Guide

 

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Cisco Systems 1300 manual Load-Dump Protection for Transportation Vehicles

1300 specifications

Cisco Systems 1300 series, commonly referred to as the Cisco Aironet 1300 Series, represents a pivotal advancement in wireless networking solutions designed for outdoor environments. These access points are primarily intended for outdoor wireless applications, including temporary installations, public areas, and enterprises requiring robust outdoor coverage.

One of the standout features of the Cisco 1300 series is its ruggedized design. The access points are built to withstand harsh weather conditions, including extreme temperatures and precipitation. They comply with IP67 ratings, ensuring protection against dust and water intrusion, making them suitable for deployment in various environmental conditions.

The Cisco 1300 series provides comprehensive WLAN coverage through its support for various wireless standards, including 802.11b, 802.11g, and 802.11n. This compatibility ensures interoperability with existing wireless infrastructure while enabling faster data rates and improved connectivity. The technology leveraged in the Cisco 1300 series offers enhanced throughput and capacity, ensuring seamless connectivity for end-users.

Another key characteristic is the integration of advanced security features. The access points support robust encryption protocols, such as WPA2 and 802.1X, safeguarding sensitive data transmitted over the air. The ability to create secure guest access networks also enhances security, allowing organizations to provide internet access without compromising internal network safety.

Cisco's proprietary features, such as Cisco CleanAir technology, further enhance the performance of the 1300 series. This technology effectively detects and mitigates wireless interference, ensuring optimal performance and reliability in congested areas. Additionally, the series supports mesh networking capabilities, allowing for flexible deployment without the necessity of extensive wiring, which is particularly advantageous for temporary or mobile installations.

Management and configuration are simplified through the use of Cisco's Wireless LAN Controller (WLC). This centralized management allows network administrators to streamline firmware upgrades, monitor performance, and enforce policy compliance across multiple access points.

In summary, the Cisco Systems 1300 series access points combine robust outdoor capabilities with advanced wireless technology, security features, and ease of management, making them a valuable asset for organizations looking to extend their networking capabilities into outdoor environments. Through their durable design and innovative technologies, the Cisco 1300 series meets the demanding needs of today’s wireless landscape.