1 Scope
This part 8 specifies the physical layer of an onboard data transmission bus between
the different equipment for service operations and monitoring of the fleet. This applies
to equipment installed on board vehicles that are operating as part of a public transport
network, i.e. in operation under public service contracts. This equipment includes
operation aid systems, automatic passenger information systems, fare collection systems,
etc.
The use of IEEE 802.11 Wireless LAN communications is excluded from the scope of this Technical Specification;
its use is not recommended for the service-based approach of CEN/TS 13149.
Equipment directly related to the safety-related functioning of the vehicle (propulsion
management, brake systems, door opening systems, etc.) are excluded from the scope
of this Technical Specification and are dealt with in other standardization bodies.
Interfaces to such equipment or safety-critical networks can be provided through dedicated
gateways.
This document covers the following:
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— The link between equipment inside vehicles consisting of one carriage only, e.g. buses and trolleybuses, as well as a set of carriages, e.g. trams and trains;
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— The Physical Layer for IP-communication networks onboard PT vehicles;
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— The cables, connectors and other equipment including pin assignment and environmental requirements.
This document specifies wired communication networks onboard PT vehicles which are based on the Ethernet specification ISO/IEC/IEEE 8802‑3-10 Base T, 100 Base Tx and 1000 Base T.