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LEU - Subset-085 functional tests


The Railway Certification Laboratory can carry out the whole set of tests for the LEU (Lineside Electronic Unit) covered by the UNISIG SUBSET-085 specification.

Compliance of the Return Loss requirements with Interface 'C1' and 'C6' of the LEU ensure correct interaction between the LEU and Balise, according to what is specified in SUBSET-036.

The measurement of the Interface 'C1' and 'C6' Return Loss at the output port of the LEU is carried out directly by a Network Analyser.

Assessment of the eye diagram for Interface 'C1' of the LEU is performed by specific software which enables all the parameters of the signal generated by the LEU to be measured:
  • Maximum amplitude and any supra-elongations
  • Eye aperture
  • Rise time and fall time during switchover
  • Temporal jitter
  • Mean Data Rate

FAQ: UNISIG SUBSET-085

​SUBSET-085 is part of the set of specifications which form the basis of the European Union Directive 96/48/EC on the interoperability of the trans-European high-speed rail system, and of the pertinent technical specifications for interoperability (TSI). It defines the specifications for the functional tests of products for the EUROBALISE system, whose requirements are defined in SUBSET-036.



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