One of the major concerns of rail operators is to establish a high-speed, reliable and continuous communication between a train in motion and the trackside for a smooth CBTC operation and also to collect data from CCTV, maintenance, VoIP, PIS, etc. and retrieve real-time information of these data streams.
> THESE APPLICATIONS REQUIRE HIGHLY-AVAILABLE NETWORKS.
The latest ACKSYS products combining WiFi 802.11ax (WiFi 6) and 5G cellular connectivity enable seamless communication with uninterrupted data flow between on-board equipment and the ground.
For subways and tramways, train-to-ground communication generally uses WiFi with access points on the ground (AP mode) and on-board (client mode).
The solution’s redundancy is ensured by 2 ACKSYS RailBox access points installed on board, one at the front of the train and the other at the rear, using the VRRP protocol.
The distance between each ground AP is determined by the speed of the subway, the throughput required and the level of redundancy required. For the ground infrastructure, ACKSYS offers 2 solutions:
- RailTrack (triple WiFi radio, 100-240 VAC power supply, SFP ports and 1Gbps Ethernet connectors in M12 format)
- RailBox (dual WiFi radio, 24-110 VDC or PoE power supply, 2.5Gbps Ethernet connectors in M12 format)
ACKSYS has developed a high-performance solution for on-board ground communication: CBB (Connect Before Break).
With a roaming time close to 0ms and a packet loss of less than 0.1%, data rates are very high and communication quality is very good. This solution requires on-board ACKSYS APs (client mode), and can work with ACKSYS ground APs or those from other manufacturers.”
Cellular communications are also increasingly used for the transmission of non-critical information such as video surveillance and passenger information, using private or public networks. Streams from several mobile networks can also be aggregated to provide an optimal connection. ACKSYS cellular RailBox are deployed in both 4G and 5G on numerous train-to-ground communication projects.
|
GIGABIT BASED MOBILITY SUITE FOR
|
|
APPLICATION HIGHLIGHTS |
||||
> MULTIPLE REDUNDANT MECHANISMS > 500 MBPS DATA THROUGHPUT AT 350 KM/H > ROAMING LATENCY < 30 ms > DIRECT CONNECTION TO TRAIN POWER SUPPLY |
> NETWORK EFFICIENCY AND SAFETY > EASY MAINTENANCE > RAILWAY HARDENED |
Railway WiFi access points & cellular routers
RailBox | RuggedAir | RailTrack | |
Function |
Cellular router or dual-radio WiFi access point |
WiFi access point, client, repeater |
WiFi access point & backbone repeater |
Recommended for |
GROUND INFRASTRUCTURES & ONBOARD |
ONBOARD |
TRACKSIDE & TUNNEL INFRASTRUCTURES |
WiFi interface |
Single or dual radio |
Single radio |
Triple radio |
Cellular interface |
Dual SIM |
– |
– |
Maximum number of clients simultaneously connected in AP mode |
512 per radio (number of clients recommended for an optimal WiFi experience : 120 per radio) |
125 per radio (number of clients recommended for an optimal WiFi experience : 40 per radio) |
N/A |
TECHNICAL CHARACTERISTICS |
|||
Ethernet interface |
2 x 2.5 Gbps |
2 x 1 Gbps |
2 x 1 Gbps (M12) |
I/O |
1 isolated input |
||
Dimensions (mm) |
80 x 175 x 57 |
80 x 175 x 57 |
305 x 200 x 75 |
Power supply |
Redundant – Isolated |
Redundant – Isolated |
Isolated |
Environment |
Extended : -40°C to +70°C, +85°C for 10 mn EN 50155 / EN 45545-2 / EN 61373 / EN 60068 |
||
FUNCTIONALITIES | |||
Roaming |
0 ms |
< 30 ms |
N/A |
Mesh (802.11s) |
YES |
YES |
YES |
Security |
Firewall, https, MAC filtering, WPA2/WPA3-Personal & Enterprise (IEEE 802.1X/RADIUS), DoS, L2 tunnels (GRE), VPN (OpenVPN, IPsec), SNMP V3, WIDS, Rogue AP detection |
||
Ethernet networking |
Frame filtering, bridge, repeater, STP/RSTP, VLAN, WMM QoS, DHCP (server and client), DNS relay |
||
Ethernet routing |
Multicast (PIM), IP redundancy (VRRP), static routes, NAT router, router |
||
Carriage coupling system SRCC |
YES |
YES |
N/A |
Administration |
http, https, SNMP agent (V1, V2C, V3), WaveManager administration software |
||
Bypass relay option |
YES |
NO |
YES |
C-Key** | YES | YES | YES |
*Optional 2nd radio interface (WiFi or cellular) **Hardened memory key (configuration backup)