scope:

This Code of Practice applies to all TRCU systems that are used to control TPWS on RETB signalled areas. It is not intended that this document addresses faulting beyond the level of an LRU. Maintainers should undertake faulting and repair of existing legacy equipment in accordance with established procedures.

For guidance on faulting TPWS track sub-system equipment, refer to RT/E/C/19048 (SIGTAN 48).

Purpose

This Code of Practice provides details of the faulting procedures, or cross-references to other faulting information necessary to locate anomalies in the operation of the Trackside Radio Control Unit (TRCU) and its associated subsystems, such that a fault can be determined down to the level of a Line Replaceable Unit (LRU). For further information regarding the Train Protection and Warning System (TPWS) / Radio Electronic Token Block (RETB) system see RT/E/S/10178.