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Fig 4. Typical equipment Block diagram
As shown in Fig.4, the redundancy at equipment level is achieved as follows:
(i) At wheel sensor level, dual detection is provided with two DPs on either rail in each
direction of traffic.
(ii) Two separate TLJBs are provided with IP65 protection for termination of each DP.
Fig 5. Termination box for DP
(iii) The 6 quad cable from Relay hut to location box is duplicated and provided in two
different paths to achieve path redundancy.
Chapter 18: Block Instruments, BPAC& IBS Working Page 382 of 535
