Uninterrupted train-to-trackside communications

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, preventive maintenance, VoIP, PIS, etc. and retrieve real-time information of these data streams.

> THESE APPLICATIONS REQUIRE HIGHLY-AVAILABLE NETWORKS.

ACKSYS’ latest products combining WiFi 802.11ac and cellular connectivity enable a truly uninterrupted communication to be established with a seamless data flow between the on-board equipment and the trackside thanks to :

  • a < 30 ms roaming between APs allowing error-free communications
  • a redundant train-to-ground wireless link allowing a continuous communication even in case of failure of one trackside AP or one onboard client

ACKSYS-Train-Train to backside-001

APPLICATION HIGHLIGHTS

 

> MULTIPLE REDUNDANT MECHANISMS
- Redundant train-to-ground communication, automatic assignment of front or rear radio (VRRP)
- Dual radio APs for trackside
- Hardware redundancy (wireless, Ethernet, power supply)

> ROAMING LATENCY < 30 ms
- Dualband, limitless channels
- Highly versatile roaming algorithm able to handle two-way traffic of a train
- IEEE802.11r fast transition protocol
- WiFi pre-authentication, OKC …

> DIRECT CONNECTION TO TRAIN POWER SUPPLY
- 24-110 VDC insulated dual input power supply

 

> NETWORK EFFICIENCY AND SAFETY
- Supports VLANs and tunnels
- Security : radius authentication

> EASY MAINTENANCE
- Configuration stored on a removable key

> RAILWAY HARDENED
- IP66
- Safety : EN45545-2 (HL3), NF F16-101 (I1F1) (Fire and Smoke) / EN60950-1
- Radio : EN300-328 1.8.1 (2.4 GHz), EN301-893 1.7.1 (5 GHz, DFS)
- EMC : EN50155 / EN50121-3-2 / EN50121-4, EN301-489-1, EN301-489-17
- Environmental : EN61373 (shocks and vibrations), EN60068 (climatic)

 

 

Rugged WiFi devices tailored for rail

 

WLg-ABOARD RailTrack

RailBox

WLg-ABOARD RailTrack RailBox
FIRMWARE FUNCTIONALITIES

Roaming

< 50 ms

N/A

< 30 ms, dualband, limitless channels, “mobile IP” for a seamless
4G LTE <> WiFi roaming (option)

Redundancy

NO

RSTP (Ethernet),
routing redundancy (VRRP)

SRCC, RSTP (Ethernet), routing redundancy (VRRP)

Routing functions

NAT router
(WiFi client)

NAT router, router

NAT router, router,
4G LTE router (option)

Streams segmentation
and prioritization

NO

- WMM, QoS, VLAN, L2 tunnel
- Multi-SSID (AP : 8 per radio)

- WMM, QoS, VLAN, L2 tunnel
- Multi-SSID (AP : 8 per radio)

Mesh

NO

802.11s (SAE secutity)

802.11s (SAE secutity)

DHCP server

AP

AP & client

Number of WiFi clients in
AP mode (maximum)

20

125 per radio
(number of clients recommended for an optimal WiFi experience : 60 per radio)

Filtering rules

NO

YES

Wireless security

802.11i, 802.1x (radius authentication)

Administration

NDM, SNMP, WEB, C-Key (removable key for configuration backup)

Alarm signaling

SNMP traps, solid state relay

TECHNICAL CHARACTERISTICS

Radio interface

1 WiFi
802.11 a/b/g
2.4/5 GHz
54 Mbps

3 WiFi
802.11 a/b/g/n/ac
2.4/5 GHz
3 x 1.3 Gbps

1 or 2 WiFi or 1 WiFi + 1 4G
802.11 a/b/g/n/ac
2.4/5 GHz
1 or 2 x 1.3 Gbps

Ethernet ports

2 x 10/100 (M12)

2 x 10/100/1000 (M12)
2 x Gigabit optic fiber (SFP cage)

2 x 10/100/1000 (M12)

Bypass relay option
(Daisy Chain Ethernet topologies)

NO

YES

YES

Dimensions (mm)

80 x 175 x 57

305 x 200 x 75

80 x 175 x 57

Power supply

Dual input
9 to 110 VDC
Isolated
PoE

110-230 VAC
(50/60 Hz)
Isolated

Dual input
24 to 110 VDC
Isolated
PoE +

Environment
Operating temperature
IP rating

-25°C to +70°C
IP66

-25°C to +70°C
Option -40°C to +85°C
IP66

-25°C to +70°C
Option -40°C to +85°C
IP66