The Modular 21 system is low-cost, completely scalable, and dynamically reconfigures to any train configuration.
Every Internet provisioned carriage is equipped with the same set of compact equipment. There is no need for a “main rack” or “brain car”. In the Modular 21 system, all carriages are equipped with indoor Wi-Fi and outdoor Wi-Fi cellular antennas, so any carriage can act as a self-contained internet on board system.
In addition, when multiple carriages equipped with the Modular 21 system are operated together in a single configuration, the Modular 21 nodes dynamically form a self-configured mesh network in which Internet traffic from any carriage can be transported over the external links from that carriage, or from any other carriage. In this way a total train system derives the advantages of bonding many cellular links, antenna diversity and automatic load balancing.
In a basic “Modular 21 system , every internet carriage is equipped with:
Further Access Points and Indoor Antennas can be added to provide better in carriage Wi-Fi coverage. Additional Access Points can network with the MCU via in carriage Ethernet cabling or via an additional OMA.
The 21Net Modular 21 Control Unit includes:
The Modular 21 Access Point and Indoor and Outdoor Antennas are standard industrial Wi-Fi equipment chosen for their suitability to the railway environment, adherence to all relevant standards, and excellent in-service performance and reliability. The Modular 21 Outdoor Mesh Antenna is a 5GHz directional antenna tailored for creating a robust wireless mesh network using a proprietary extension of 802.11a Wi-Fi. The Modular 21 Outdoor Cellular Antenna is a multi-band antenna that combines the signals for GPS and multiple cellular data modems.
All carriages are equipped with Modular 21 are equal peers able to communicate with one another via the Inter-Carriage Mesh Network, and with the Internet via Cellular Data Cards located in any Modular 21 node.