Tender invited for Development of Train Collision Avoidance System

ISO 9001: 2008 Effective from 18.06.2012 RDSO/SPN/196/2012 Version 3.1.1
Document Title : Specification of Train Collision Avoidance System
normal speed shall be restored only when either the SOS message is
cancelled by the source which generated the SOS or when the train has
moved away by more than 3000m from the source which generated the SOS
or SOS message reception is discontinued from the source for more than 3
minutes, whichever is earlier.
5.16.3 In case of SOS by Loco unit, message shall be received by nearest station
unit which shall relay it to other locos in its vicinity and also to station on other
side of loco which has generated SOS. Further, Loco unit shall alternately
transmit the SOS by inverting its frequency sothat locos in its vicinity can
directly receive SOS.
5.17 Controlled Mode: The movement of the train having Loco unit in ‘controlled
mode’ shall be as under:
5.17.1 When any Loco unit fitted train(s) is approaching the controlled mode Loco
unit train within 3000m, a speed restriction of 15 kmph shall be imposed by all
such trains including self-train. Normal speed can be resumed by each
approaching train when it crosses the controlled mode TCAS train. Similarly,
normal speed can be resumed by controlled mode TCAS train when no train
is approaching it within 3000m. This process shall repeat till such time
controlled mode TCAS train gets correct track identification.
5.17.2 In addition to above, while approaching a station, the speed of the controlled
mode Loco unit train shall be restricted to 15 KMPH at the first point while
entering the station area if any of the main line is not set to main line or if all
the main lines are set to straight & any of the main line berthing portion is
occupied and this speed restriction shall continue till such time complete train
enters the block section where it will be governed by 5.17.1. The speed
restriction by other trains shall be governed as mentioned in 5.17.1.
5.18 Communication arrangement
5.18.1 The Loco as well as Station TCAs shall have duplicated hot standby radios so
that in case of failure of one radio, the train protection can be achieved
through other radio for a limited distance before the loco is taken out of the
service.
5.18.2 The Station unit shall have an Ethernet portfor connecting them to Centralized
Management System.
5.18.3 The radio frame refresh rate shall be 2 secs.
5.18.4 If Loco unit, after establishing communication with station unit from a distance
of 2000m from FSS, misses more than two continuous packets, it shall go into
Restricted Mode. Loco unit shall come out of Restricted Mode as soon as it
receives two continuous packets.
Signal Directorate RDSO/Lucknow Page 21 of 56