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
Loco unit, when not provided with any preferred Transmission Window, shall
look for “Carrier Detect” for transmission in the nominated portion for this
purpose in the frame and commence transmission accordingly. In case,
collision of radio signals is detected, the Loco unit would retransmit after
randomization. In order to improve the throughput, on recognition of radio
signal from a fresh Loco pertaining to the territory of local interlocking, the
Station unit shall nominate a preferred Window for Transmission by that
particular Loco unit. Till such period nomination by Station unit continues, the
Loco would continue to transmit in the same preferred Transmission Window.
6.16. In case of failure of reception from any stationary unit by Loco unit, apart from
transmission by Loco on regular frequency, it would also transmit the
emergency message additionally on other frequency in the portion of the frame
nominated for this purpose so that the other nearby Locos can receive the
messages directly.
6.17. Loco unit Antenna shall be Omni-direction & shall have vertical polarization with
EIRP 15dbW or better at 5 degree elevation.
6.18. Loco unit antenna shall be able to withstand wind speed upto 200 kmph when
the Loco is moving directly against the wind.
6.19. The outdoor cable for connection to Loco unit and GPS Antennae should be
waterproof. This should be compliant to RDSO Spec No. MP.0.52.00.08 (Rev.-
03) or latest as applicable.
Encryption
6.20. The data shall be encrypted by TCAS unit before sending the packet to radio
equipment for further transmission or on RS485 port for OFC/Quad cable
communication.
6.21. Deleted.
6.22. AAS-128 encryption method shall be used for encryption of data before
transmitting from one TCAS unit to the other.
Communication between Station/ IBS/ Gate unit to other Station/ IBS/ Gate unit
on OFC/ Cable:
6.23. The station / IBS unit shall have at least two (expandable upto 6 for station unit)
RS485 ports & shall be connected to all adjacent station TCAS’ on OFC/ Cable.
In addition one USB 2.0 or higher ports shall also be provided for data transfer,
diagnostic etc. purposes. RS485 ports shall be internally wired through built-in
modem for interfacing with Quad Cable Network.
6.24. Gate unit shall be provided at mid-section interlocked LC gates & shall have at
least two RS485 ports. Station/ IBS unit shall also be connected to any midsection
Level crossing interlocked gate unit on OFC/ Cable. In addition one
USB 2.0 or higher ports shall also be provided for data transfer, diagnostic etc.
purposes. RS485 ports shall be internally wired through built-in modem for
interfacing with Quad Cable Network. The modem shall support V.34 as well as
V.90 modulation as per ITU-T.
6.25. Station/ IBS/ Gate unit shall have at least one Ethernet port for connectivity with
Centralized Management System.
6.26. As soon as a TCAS train enters in a block section, sending station/ IBS unit
shall inform the receiving station / IBS unit about the entry of a Loco unit in the
block section by sending packet as described in Annexure-V.
6.27. On Clearance of a train (Loco unit + Train length) from block section, Receiving
Station/ IBS unit shall inform the sending station / IBS unit about the exit of a
Loco unit from the block section by sending packet as described in Annexure-
V.
6.28. Both the station /IBS unit of a block section shall not permit any other train with
same TIN into the same block section till the earlier train with same TIN has
cleared the block section as per both station /IBS unit’.
Signal Directorate RDSO/Lucknow Page 26 of 56