The Delhi Metro uses cab signalling along with a centralised automatic train control system consisting of automatic train operation, Automatic Train Protection and automatic train signalling modules. A 380 MHz digital trunked TETRA radio communication system from Motorola is used on all 6 lines to carry both voice and data information. or Line 3,4 Siemens Transportation Systems has supplied the electronic interlocking Sicas, the operation control system Vicos OC 500 and the automation control system LZB 700 M. An integrated system comprising optical fibre cable, on-train radio, CCTV, and a centralised clock and public address system is used for telecommunication during train operations as well as emergencies. For Line-1 and Line-2 ALSTOM has supplied signalling system and for line 5,6 Bombardier has supplied signalling system.
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