Layer 2 CBTC - Minimized Headways with Safe ...

SPHINX in Europe
UK
  • AT
  • BE
  • DK
  • FR
  • DE
  • IE
  • IT
  • NL
  • ES
  • SE
  • CH
  • UK
Applications > Layer 2 CBTC - Minimized Headways with Safe ...

Layer 2 CBTC - Minimized Headways with Safe Operations for CBTC

Minimized Headways with Safe Operations for CBTC


46_95.jpg
Minimized Headways with Safe Operations for CBTC


CBTC uses constant bi-directional radio communications between train and trackside equipment to increase line capacity by reducing headways. To do this, the moving block train control system needs real-time train operating data to enforce safe spacing. Any communications loss may disrupt the CBTC and bring trains to a stop. Consequently, CBTC networks have strict standards for availability and latency. In metro lines, frequent train roaming may cause long latency in RF-based CBTC networks. A roaming handoff time of less than 50 ms is vital for uninterrupted trainto-trackside connectivity. Momentary breaks may occur on radio networks; but a CBTC can only tolerate a packet loss rate of under 0.1%.





Network Requirements

  • Fast secure roaming:
    • Handoff of less than 50 ms for continuous CBTC operations
  • Sufficient throughput:
    • 4 Mbps throughput to support all CBTC functions
  • Error tolerance:
    • Packet loss rate of less than 0.1%
  • Network latency:
    • Maximum latency of 5 ms to achieve overall CBTC performance


Moxa Solutions

  • Layer 2 Turbo Roaming (handoff <50 ms):
    • WAC-1001 wireless access controller enables rapid roaming with centralized security
    • 3 non-overlapping channels of roaming for less interference
    • Packet loss rate of under 0.1%
  • Network latency under 1 ms
  • Stable throughput: 4 Mbps of throughput
  • Roaming diagnosis service




Accept all Reject Configure

This website uses cookies to provide the best possible experience. More information.