DD ENV 13149-2:2000

Foreword
Introduction
1 Scope
2 Normative references
3 Cabling specifications
      3.1 General remarks
      3.2 Characteristic impedance
      3.3 Polarity
      3.4 Signal conductors
      3.5 Connections between devices
      3.6 Connection/disconnection of a device
      3.7 Spur length
      3.8 Connectors
      3.9 Branch cable polarity
      3.10 Cable jointing
      3.11 Clustered connections to the bus
      3.12 Multiple clusters
      3.13 Shield ground connection
      3.14 Shield connections at a device
      3.15 Noise from additional circuits
      3.16 Trunk terminating load resistance
      3.17 Test tap connection
      3.18 Test device
      3.19 Power circuit initialisation
      3.20 Continuous power conditions
      3.21 Power circuit distribution and protection
      3.22 Cabling inside a vehicle
Annex A (informative) Cable specifications
Annex B (informative) Data transmission trunk cable
                      installation guidelines
Bibliography

Establishes cabling specifications for an onboard data transmission bus between the different parts of equipment for service operations and monitoring of the fleet. Applies to equipment installed onboard buses, trolley buses and tramways as part of a bus fleet operation only; equipment includes operations aid systems, automatic passenger information systems, fare collection systems etc. Does not relate to the functioning of the vehicle, e.g. engine management, brake systems, driver dashboard ro or door opening systems. Not applicable to tramways operated as part of a train, metro or subway operation.