Page 562 - IRSEM_Main Book

20. "Corrective Maintenance" is as defined in "General Guidelines for Management of
Implementation Standards".
21. "Data Transmission system (hereinafter "DTS")" means the system which is installed as
communication backbone between OCC, Stations, Traction Substations, Depots and
other locations and shall be highly reliable for usage of important, vital and critical
system.
22. "Dead Section" means a section of track, either within a track circuit or between two
track circuits, the rails of which are not part of a track circuit for detecting Trains.

23. "Departure Route" is as defined in "General Guidelines for Management of
Implementation Standards".

24. "Departure Route (ATC) (hereinafter "Departure Route")" is as defined in "General
Guidelines for Management of Implementation Standards".

25. "Despatcher FAX" means the system which transmits Fax simultaneously to designated
groups such as Stations (including Rolling Stock Depots), train crew depots and
maintenance depots.

26. "Despatcher Telephone" means the system which provides voice communication
between Controllers and agencies involved in safety and/or train operation for carrying
out tasks smoothly and quickly.

27. "Audio Frequency Track Circuit (hereinafter "AFTC")" means the track circuit which uses
audio frequency to transmit MA to the on-board system for ATC.
28. "Direct Telephone between Adjacent Stations" means the system which ensure instant
and uninterruptible voice communication between two adjacent Stations (including
Rolling Stock Depots) for substitute safety operation or other operations as required.

29. "Disaster Prevention System" means the system which shall collect the information like
the wind, rainfall and rail temperature and have the function of displaying the received
information on the monitoring terminals and CIC Systems in OCC and at other locations
as required.

30. "Interlocking" means an arrangement of Signals, Points and other appliances which are
operated from a panel or lever frame and interconnected by mechanical locking,
electrical locking or electronic locking so that their operation can take place in proper
sequence to ensure safety.

31. "Leaky Coaxial Cable (hereinafter "LCX")" means the cable that radiates radio waves of
a desired frequency along its length.
32. "Maintenance" is as defined in "General Guidelines for Management of Implementation
Standards".

33. "Maintenance Work" is as defined in "General Guidelines for Management of
Implementation Standards".
34. "Movement Authority (hereinafter "MA")" is as defined in "General Guidelines for
Management of Implementation Standards".
35. "Passenger Station" is as defined in "General Guidelines for Management of
Implementation Standards".

Annexure G2: Brief of High Speed Signalling – Mumbai-Ahmedabad Page 505 of 535