Page 328 - IRSEM_Main Book

13.2.5 ETCS Level 2

(a) Level 2 is a radio-based system, which is used as an overlay on an
underlying signalling system. Level 2 is based on radio for track to train
communication and on balises as spot transmission devices mainly for
location referencing.

(b) Track side equipment of Level-2 comprises of:

(i) Balises
(ii) Radio Block Centre (RBC)

(iii) Radio network

(c) On-board equipment of Level-2 comprises of:

(i) On-board Vital Computer (OBC)

(ii) Data logger for diagnostics (either part of OBC or separate)
(iii) Driver Machine Interface (DMI), indications & and non-resettable
counters

(iv) Balise Transmission Module (BTM)

(v) Balise antenna fixed to the under frame

(vi) GSM-R/LTE Radio

(vii) Speed Sensors Such as Pulse Generators, Accelerometers, Radar etc.
(viii) Train Interface Unit (TIU)

(ix) Interface to existing brake control system which in turn controls
application of service/emergency brakes or interface to existing brake
system directly

(x) Power supply arrangement
(xi) Suitable isolation arrangement for isolating the system.

(d) Level 2 provides a continuous speed supervision system, which also
protects against overrun of the authority by applying brakes.

(e) Based on inputs received from Signalling interlocking, Radio Block Centre
generates Movement Authorities which are transmitted to the train via radio.

(f) Train detection and train integrity supervision are performed by the trackside
equipment of the underlying signalling system (interlocking, track circuits
etc.) and are outside the scope of Level 2.

(g) Level 2 provides bi-directional track-train communication.

(h) Train movements shall be supervised continually by the radio block centre in its
territory.

Chapter 13: ATP, ETCS, IRATP (TCAS) & TMS Page 282 of 535