supply of up-gradation and retro-fitment of audio alert unit to signal location announcement system (silas) with data loggerup-gradation and retro-fitment of audio alert unit to signal location announcement system (silas) with data logger,up-gradation and retro-fitment of audio alert unit to signal location announcement system (silas) with data logger in kalva carshed based emu dcabs as per specification attached as annexure-a & b. [ warranty period: 30 months after the date of delivery ] ] , supply, installation, testing and commissioning of gsm module, gsm antenna on upgraded si las and its integration with cloud server along with design of web page/user interface to remotely track & monitor emu rakes in kalva carshed based emu dcabs as per specification attached as annexure-c. set c onsists of 04 items as mentioned in annexure-d. [ warranty period: 30 months after the date of delivery ] ]