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Railway Automation Solution

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ACC

Automatic Error-free Inter-carriage Wireless Links
Introduction 
A DCS architecture provides data connectivity between onboard applications and ground infrastructure regardless of the position of the train along the line. The architecture is protected by a high-level security system to prevent unauthorized access. A moving train is only connected to a specific wayside AP for a few seconds, and handover times that exceed 100 ms may cause critical data loss. The rail industry therefore faces a stark challenge in order to achieve uninterrupted, reliable communications: reduce roaming time to below 50 ms in a redundant DCS system.


Application Requirements 
Automatic inter-carriage link when train compositions change
 · Minimal labor costs and manual error
High throughput requirements
 · Control systems: Min. 20 Mbps
 · Multimedia entertainment: Min. 100 Mbps
Non-interference operation especially in areas of high carriage density, such as train depots
Adapted to specific vehicle types
Secure network access
 · Multimedia entertainment: Min. 100 Mbps
 · Multimedia entertainment: Min. 100 Mbps


Moxa's Solutions

 
Connect and Disconnect inter-carriage APs automatically Designed specifically for railway operating conditions, Moxa's proprietary Auto Carriage Connection (ACC) can adapt to any change in train compositions. Unlike WDS, ACC forms new wireless bridges automatically, not manually, while also maintaining high network security with WPA and WPA2. Each AP only needs to be configured once, and consequently operators no longer need to manually re-set their AP device each time they re-compose the carriages. In addition, a timeout period is in place to confirm that the two carriages are in fact engaged and linked, thus avoiding an unwanted association. The ACC greatly minimizes onsite labor and human error.
 
  
Fulfill high throughput needs with 802.11n To fulfill high throughput needs for high-density media streaming applications on trains, ACC is also implemented on the 802.11n AWK-3131-RTC product. Moxa's 802.11n solutions feature bandwidth up to 300 Mbps that extends link reliability at long range by optimally combining the MIMO signal paths and 40-MHz channel bonding.
 
Rugged Anti-vibration M12 connection Moxa provides entire M12 connection products that can tolerate constant vibration and heavy shock in the harshest railway environments
 
Select the right antennas for ACC An ACC link is a one-to-one, short distance connection that calls for directional and low gain antennas. A directional antenna can be oriented to transmit to the target AP and also avoids unnecessary wireless links with neighboring trains in high carriage density areas, such as a depot. A low gain antenna further limits the coverage range to just the specific target area.

Application Architecture

Automatic Error-Free Carriage-to-Carriage Links
AWK-3121-RTC Single RF AP
Enable ACC links (Auto Carriage Connection)
AWK-3131-RTC 802.11n Single-RF AP
Enable ACC links and 802.11n network
AWK-5222-RTC Dual-RF AP
One RF is for ACC wireless bridging and the other RF serves as an access point for passenger mobile access


Product Offerings

AWK-RTC Series Carriage-to-Carriage AP/Bridge/Client
   
AWK-3121-RTCAWK-4121-RTC
Single-RF AP/Bridge/ClientSingle-RF Outdoor AP/Bridge/Client
 
 
AWK-3131-RTC
802.11n Single-RF AP/Bridge/Client
  
·ACC (Auto Carriage Connection)
·Static Routing with NAT (2012)
·Security: WPA/WPA2/802.11i
·Ruggedness
 
·Ruggedness:
-M12, -40 to 75°C
-

One SSC fiber optic port

·Certifications:
 
-Onboard: EN 50155/50121-3-2 and IEC 61373
-Trackside: EN 50121-1/50121-4
·Standards: 802.11a/b/g/n
·Supports up to 150 Mbps throughput
·ACC (Auto Carriage Connection)
·Static routing with NAT (2012)
·Security: WPA/WPA2/802.11i
·Railway hardened:
 
·Ruggedness:
-M12, -40 to 75°
-

One SSC fiber optic port

·Certifications:
 
-Onboard: EN 50155/50121-3-2 and IEC 61373
-Trackside: EN 50121-1/50121-4